Platform and system for testing horizontal temperature of radio frequency superconducting cavity and using method of platform and system

Abstract

The invention provides a radio frequency superconducting cavity level temperature test platform and system and a use method thereof, and relates to the field of large-scale superfluid helium low-temperature refrigeration. The platform comprises a horizontal test valve box, a plurality of air return pipelines, a plurality of air inlet pipelines, a negative pressure heat exchanger, a negative pressure protection and safety release integrated device, horizontal test valve box vacuum obtaining equipment, thermostat vacuum obtaining equipment and a displacement pump set. Flanges are arranged on a plurality of air return pipelines and a plurality of air inlet pipelines, so that mechanical connection interfaces are provided for cryostats of different types of radio frequency superconducting cavities. The low-temperature valves, the pressure sensors and the temperature sensors are arranged on the air return pipelines and the air inlet pipelines, so that the low-temperature cooling capacity required by testing can be provided according to the design requirements of the radio frequency superconducting cavity and corresponding design parameters, and the working performance of the radio frequency superconducting cavity under the design working condition can be accurately obtained; and comprehensive design indexes are checked, and high-fidelity experimental data are provided for efficient and stable operation of the superconducting accelerator.

Description

Technical Field

[0001] The present invention relates to the technical field of large-scale superfluid helium cryogenic refrigeration, and in particular to a platform, a system and a use method of a radio frequency superconducting cavity horizontal temperature test. Background Art

[0002] As the core cold mass of the superconducting accelerator, the RF superconducting cavity is coupled with various types of cold masses such as couplers, superconducting solenoids and current leads, and undertakes the core task of particle acceleration. Due to the complex design and high integration of the RF superconducting cavity, it must be horizontally tested when it is officially installed and put into operation. It usually refers to a test conducted at a fixed level (or condition) to evaluate the performance of the RF superconducting cavity in a stable state. This test method can ensure that the RF superconducting cavity can find relevant problems, obtain relevant data, and verify its performance indicators under the designed working conditions.

[0003] At present, there are differences in the design of RF superconducting cavities of different superconducting accelerators, and their process solutions are quite different from each other. Therefore, it is urgent to develop horizontal testing systems for different types of RF superconducting cavities to realize multi-temperature zone and high-stability experiments, and provide a reliable experimental system for horizontal temperature testing experiments of RF superconducting cavities of different superconducting accelerators. Summary of the invention

[0004] The present invention provides a platform for horizontal temperature testing of radio frequency superconducting cavities, which is used to solve the problem that the prior art cannot quickly and accurately obtain the working performance of different types of radio frequency superconducting cavities under designed working conditions and cannot test their comprehensive design indicators.

[0005] The present invention provides a platform for horizontal temperature testing of a radio frequency superconducting cavity, comprising a horizontal test valve box, a plurality of return air pipelines, a plurality of intake air pipelines, a negative pressure heat exchanger, a negative pressure protection and safety relief integrated device, a horizontal test valve box vacuum obtaining device, a thermostat vacuum obtaining device and a displacement pump group, wherein the negative pressure heat exchanger, the plurality of return air pipelines and the plurality of intake air pipelines are arranged in the horizontal test valve box, the plurality of return air pipelines and the plurality of intake air pipelines are all provided with low temperature valves, pressure sensors and temperature sensors, the input end of the return air pipeline is connected to the corresponding thermostat output The output end of the return air pipeline is connected to the distribution and transmission system; the input end of the intake air pipeline is connected to the distribution and transmission system, the output end of the intake air pipeline is connected to the corresponding thermostat input end, the negative pressure heat exchanger is connected in series to one of the return air pipelines and one of the intake air pipelines, the negative pressure protection and safety discharge integrated device is connected to the distribution and transmission system, the return air pipeline, the displacement pump group and the thermostat; the horizontal test valve box vacuum acquisition device is connected to the horizontal test valve box, and the thermostat vacuum acquisition device is connected to the thermostat; The multiple air return lines include: A first air return pipeline, wherein an input end of the first air return pipeline is connected to an output end of a corresponding thermostat, and an output end of the first air return pipeline is connected to a cold screen air return pipeline of the distribution and transmission system; a second air return pipeline, wherein an input end of the second air return pipeline is in communication with a corresponding thermostat output end, and an output end of the second air return pipeline is in communication with a coupler air return pipeline of the distribution transmission system; A third air return pipeline, wherein the input end of the third air return pipeline is connected to the corresponding thermostat output end, and the output end of the third air return pipeline is connected to the 2K air return pipeline of the distribution transmission system; The plurality of air intake lines include: A first air intake pipeline, wherein an input end of the first air intake pipeline is connected to a 4.5K air supply pipeline of the distribution and transmission system, and an output end of the first air intake pipeline is connected to a corresponding thermostat input end; A second air intake pipeline, wherein the input end of the second air intake pipeline is connected to the cold screen air supply pipeline of the distribution and transmission system, and the output end of the second air intake pipeline is connected to the corresponding thermostat input end.

[0006] According to a platform for horizontal temperature testing of a radio frequency superconducting cavity provided by the present invention, the first input port and the first output port of the negative pressure heat exchanger are serially connected to the third return air pipeline, and the second input port and the second output port of the negative pressure heat exchanger are serially connected to the first air inlet pipeline.

[0007] According to a platform for horizontal temperature testing of a radio frequency superconducting cavity provided by the present invention, the first return air pipeline is provided with a sixteenth cryogenic valve, a fifth pressure sensor and a sixth temperature sensor, wherein the sixth temperature sensor is located between the sixteenth cryogenic valve and the fifth pressure sensor; the second return air pipeline is provided with a thirteenth cryogenic valve, a sixth pressure sensor and a seventh temperature sensor, wherein the seventh temperature sensor is located between the thirteenth cryogenic valve and the sixth pressure sensor; the third return air pipeline is provided with a tenth cryogenic valve, an eleventh cryogenic valve, a first pressure sensor, a second pressure sensor, a first temperature sensor, a second temperature sensor and an eighth temperature sensor, wherein the eleventh cryogenic valve is located between the eighth temperature sensor and the first output port of the negative pressure heat exchanger, and the first temperature sensor and the The first pressure sensor is located between the eleventh cryogenic valve and the first output port of the negative pressure heat exchanger, and the second pressure sensor and the second temperature sensor are located between the tenth cryogenic valve and the first input port of the negative pressure heat exchanger; the first air intake pipeline is provided with a sixth cryogenic valve, a third pressure sensor, a fourth pressure sensor, a third temperature sensor and a fourth temperature sensor, wherein the fourth pressure sensor and the fourth temperature sensor are located between the sixth cryogenic valve and the second output port of the negative pressure heat exchanger, and the third temperature sensor is located between the third pressure sensor and the second input port of the negative pressure heat exchanger; the second air intake pipeline is provided with a ninth cryogenic valve, a seventh pressure sensor and a fifth temperature sensor, wherein the seventh pressure sensor is located between the ninth cryogenic valve and the fifth temperature sensor.

[0008] According to a platform for horizontal temperature testing of an RF superconducting cavity provided by the present invention, the first return air pipeline between the sixth temperature sensor and the sixteenth cryogenic valve is connected to the cooling return air pipeline of the distribution and transmission system through the fifteenth cryogenic valve; the second return air pipeline between the seventh temperature sensor and the thirteenth cryogenic valve is connected to the cooling return air pipeline of the distribution and transmission system through the fourteenth cryogenic valve; the third return air pipeline between the eleventh cryogenic valve and the first pressure sensor is connected to the cooling return air pipeline of the distribution and transmission system through the twelfth cryogenic valve.

[0009] According to a platform for horizontal temperature testing of a radio frequency superconducting cavity provided by the present invention, the plurality of air inlet pipelines further include: a third air intake pipeline, wherein an input end of the third air intake pipeline is in communication with the first air intake pipeline between the third pressure sensor and the third temperature sensor, and an output end of the third air intake pipeline is in communication with a corresponding thermostat input end; the third air intake pipeline is provided with a seventh cryogenic valve, an eighth pressure sensor and a ninth temperature sensor, and the eighth pressure sensor is located between the seventh cryogenic valve and the ninth temperature sensor; A fourth air intake pipeline, wherein the input end of the fourth air intake pipeline is connected to the first air intake pipeline between the third pressure sensor and the third temperature sensor, and the output end of the fourth air intake pipeline is connected to the corresponding thermostat input end; and the fourth air intake pipeline is provided with an eighth low-temperature valve.

[0010] According to a radio frequency superconducting cavity horizontal temperature test platform provided by the present invention, the second air inlet pipeline between the ninth cryogenic valve and the seventh pressure sensor is provided with a first temperature mixer, and the input end of the first temperature mixer is connected to the re-temperature air supply pipeline of the distribution and transmission system through a sixth normal temperature pneumatic valve; The third air intake pipeline between the eighth pressure sensor and the seventh low-temperature valve is provided with a second temperature mixer, and the second temperature mixer is connected to the rewarming air supply pipeline of the distribution and transmission system through a second one-way valve and a seventh normal temperature pneumatic valve in sequence, and the rewarming air supply pipeline of the distribution and transmission system is provided with a tenth pressure sensor and a switch valve.

[0011] According to a platform for horizontal temperature testing of radio frequency superconducting cavities provided by the present invention, the first return air pipeline is connected to a recovery and purification system through a first connecting pipeline, a third first-level safety valve and a third bursting disc are provided on the first connecting pipeline, and the first connecting pipeline between the third bursting disc and the first return air pipeline is connected to the replacement pump group through a third normal temperature pneumatic valve; the second return air pipeline is connected to a recovery and purification system through a second connecting pipeline, a second first-level safety valve and a second bursting disc are provided on the second connecting pipeline; the second connecting pipeline between the second bursting disc and the second return air pipeline is connected to the replacement pump group through a second normal temperature pneumatic valve; The platform includes a first negative pressure protection and safety relief integrated device and a second negative pressure protection and safety relief integrated device, the air inlet of the first negative pressure protection and safety relief integrated device is connected to the third air return pipeline through a first one-way valve, the air supply port of the first negative pressure protection and safety relief integrated device is connected to the low-pressure branch of the refrigerator system of the distribution and transmission system, the displacement air outlet of the first negative pressure protection and safety relief integrated device is connected to the displacement pump group through a fourth normal temperature pneumatic valve; the recovery and purification air outlet of the first negative pressure protection and safety relief integrated device is connected to the recovery and purification system; the pressure relief air outlet of the first negative pressure protection and safety relief integrated device is connected to the first bursting disc through the first and second level safety valves; The air inlet of the second negative pressure protection and safety relief integrated device is connected to the thermostat, the air supply port of the second negative pressure protection and safety relief integrated device is connected to the low-pressure branch of the refrigeration system of the distribution and transmission system, and the displacement air outlet of the second negative pressure protection and safety relief integrated device is connected to the displacement pump group through the fifth normal temperature pneumatic valve; the recovery and purification air outlet of the second negative pressure protection and safety relief integrated device is connected to the recovery and purification system, and the pressure relief air outlet of the second negative pressure protection and safety relief integrated device is connected to the fourth bursting disc through the fourth secondary safety valve.

[0012] The present invention also provides a system for radio frequency superconducting cavity horizontal temperature testing, the system comprising a helium storage system, a refrigerator system, a distribution and transmission system, a superfluid helium acquisition system, a recovery and purification system, a control integration system and a platform for radio frequency superconducting cavity horizontal temperature testing as described in any of the above items.

[0013] The present invention also provides a method for using a system for horizontal temperature testing of a radio frequency superconducting cavity, comprising: Step S1, vacuuming the horizontal test valve box by using a horizontal test valve box vacuum acquisition device, and vacuuming the thermostat by using a thermostat vacuum acquisition device, so that the horizontal test valve box and the thermostat maintain a vacuum of 1×10 -4 Vacuum state of Pa magnitude; Step S2, open the sixth cryogenic valve to the sixteenth cryogenic valve, the first normal temperature pneumatic valve to the fifth normal temperature pneumatic valve and the replacement pump group to evacuate multiple return air pipelines and multiple air intake pipelines in the distribution transmission system and the horizontal test valve box; obtain the values ​​of the first pressure sensor to the ninth pressure sensor, and when the maximum value of the values ​​of the first pressure sensor to the ninth pressure sensor is lower than 100Pa, close the replacement pump group and the first normal temperature pneumatic valve to the fifth normal temperature pneumatic valve; then open the switch valve, the sixth normal temperature pneumatic valve and the seventh normal temperature pneumatic valve, and slowly inject 300K helium into the pipeline. When the maximum value of the values ​​of the first pressure sensor to the ninth pressure sensor reaches 1.5bar, close the switch valve, the sixth normal temperature pneumatic valve and the seventh normal temperature pneumatic valve, and let it stand for a first predetermined time; Step S3, repeating step S2 multiple times to ensure the replacement effect; Step S4, open the ninth cryogenic valve and the fifteenth cryogenic valve, and maintain the opening of the fifteenth cryogenic valve at more than 90%, gradually increase the opening of the second cryogenic valve and the ninth cryogenic valve to cool down the cold shield components of the horizontal test valve box and the thermostat, obtain the value of the sixth temperature sensor, and when the value of the sixth temperature sensor stabilizes to 75K, open and slowly and gradually increase the opening of the sixteenth cryogenic valve, and slowly close the fifteenth cryogenic valve; Step S5, opening the first cryogenic valve and the fourteenth cryogenic valve, and then opening the seventh cryogenic valve, and gradually increasing the opening of the seventh cryogenic valve to prepare 4.5K@1.3bar liquid helium; at the same time, opening the sixth cryogenic valve and maintaining a small opening to cool the negative pressure heat exchanger; Step S6, controlling the opening of the seventh cryogenic valve so that the value of the 4.5K liquid helium level gauge in the thermostat is 95%, and limiting the minimum opening of the seventh cryogenic valve to 10%; Step S7, turning on the 2K gas heater of the superfluid helium acquisition system and preheating it for a second predetermined time to fully activate the heater; Step S8, start the superfluid helium decompression and cooling pump group of the superfluid helium acquisition system, slowly close the seventh cryogenic valve, close the fourteenth cryogenic valve, and then slowly open the thirteenth cryogenic valve; gradually increase the opening of the sixth cryogenic valve, start throttling and decompression, and obtain 2K@0.03bar superfluid helium; Step S9, when the 4.5K@1.3bar liquid helium in the thermostat is converted into 2K@0.03bar superfluid helium, the opening of the sixth cryogenic valve is adjusted so that the value of the 2K superfluid helium level gauge is 95%, a 2K test is performed, and then the minimum opening of the sixth cryogenic valve is adjusted to 10%; Step S10, after the test is completed, open the fourteenth cryogenic valve, close the thirteenth cryogenic valve and the superfluid helium acquisition system, and slowly close the first cryogenic valve and the second cryogenic valve to stop supplying cold to the horizontal test valve box and the thermostat; Step S11, turning on the solid contact DC power heater in the thermostat, and controlling the power of the solid contact DC power heater to be within a predetermined range; when the value of the temperature sensor around the solid contact DC power heater reaches 70K, turning off the solid contact DC power heater; Step S12, opening the switch valve, the fifth normal temperature pneumatic valve and the sixth normal temperature pneumatic valve, and inputting 300K normal temperature into the horizontal test valve box and the thermostat to accelerate the rewarming speed; Step S13, when the value of the temperature sensor around the solid contact DC power heater reaches normal temperature, the vacuum pump group of the horizontal test valve box vacuum obtaining device and the thermostat vacuum obtaining device is turned off.

[0014] The platform for horizontal temperature testing of radio frequency superconducting cavities provided by the present invention provides mechanical connection interfaces for cryostats of different types of radio frequency superconducting cavities by arranging flanges on multiple return air lines and multiple air inlet lines. By arranging cryogenic valves, pressure sensors and temperature sensors on multiple return air lines and multiple air inlet lines, the low temperature cooling required for testing can be provided according to the design requirements of the radio frequency superconducting cavity and the corresponding design parameters, and the working performance of the radio frequency superconducting cavity under the design working conditions can be accurately obtained, and its comprehensive design indicators can be tested, so as to provide high-fidelity experimental data for the efficient and stable operation of the superconducting accelerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a structural schematic diagram of a system for horizontal temperature testing of a radio frequency superconducting cavity provided by the present invention.

[0017] Figure 2 yes Figure 1 The locally enlarged structure at point A in the middle.

[0018] Figure 3 yes Figure 1 The local enlarged structure at point B in the middle.

[0019] Reference numerals: 100, horizontal test valve box; L1, first air return line; L2, second air return line; L3, third air return line; L4, first air inlet line; L5, second air inlet line; L6, third air inlet line; L7, fourth air inlet line; L8, rewarming air supply line; L9, cooling air return line; L10, coupler air return line; L11, 2K air return line; L12, cold screen air return line; L13, cold screen air supply line; L14, 4.5K gas supply pipeline; L15, low-pressure branch of refrigerator system; HX01, negative pressure heat exchanger; CV01, first cryogenic valve; CV02, second cryogenic valve; CV03, third cryogenic valve; CV04, fourth cryogenic valve; CV05, fifth cryogenic valve; CV06, sixth cryogenic valve; CV07, seventh cryogenic valve; CV08, eighth cryogenic valve; CV09, ninth cryogenic valve; CV10, tenth cryogenic valve; CV11, eleventh cryogenic valve; CV12, twelfth cryogenic valve; CV13, thirteenth cryogenic valve; CV14, fourteenth cryogenic valve; CV15, fifteenth cryogenic valve; CV16, sixteenth cryogenic valve; P1, first pressure sensor device; P2, second pressure sensor; P3, third pressure sensor; P4, fourth pressure sensor; P5, fifth pressure sensor; P6, sixth pressure sensor; P7, seventh pressure sensor; P8, eighth pressure sensor; P9, ninth pressure sensor; P10, tenth pressure sensor; T1, first temperature sensor; T2, second temperature sensor; T3, third temperature sensor; T4, fourth temperature sensor; T5, fifth temperature sensor; T6, sixth temperature sensor; T7, seventh temperature sensor; T8, eighth temperature sensor; T9, ninth temperature sensor; T10, tenth temperature sensor; SVG01, first negative pressure protection and safety release integrated device; SVG02, The second negative pressure protection and safety release integrated device; WV01, the first normal temperature pneumatic valve; WV02, the second normal temperature pneumatic valve; WV03, the third normal temperature pneumatic valve; WV04, the fourth normal temperature pneumatic valve; WV05, the fifth normal temperature pneumatic valve; WV06, the sixth normal temperature pneumatic valve; WV07, the seventh normal temperature pneumatic valve; SV02, the second level safety valve; SV03, the third level safety valve; BP01, the first bursting disc; BP02, the second bursting disc; BP03, the third bursting disc; BP04, the fourth bursting disc; SV01-1, the first level safety valve; SV01-2, the first level safety valve; SV04-1, the fourth level safety valve; SV04-2, the fourth level Safety valve; Mix1, first temperature mixer; Mix2, second temperature mixer; VN01, first non-return valve; VN02, second non-return valve; PV01, switch valve; VH01, vacuum cover; TS01, horizontal test valve box cold shield assembly; VS01, first vacuum silicon; Pump3, displacement pump group; BV01, first gate valve; BV02, second gate valve; Pump1, first displacement pump assembly; Pump2, second displacement pump assembly; VS02, second vacuum silicon; Ln, normal temperature pipeline; Lm, multi-channel transmission pipeline; 200, thermostat; 300, distribution transmission system; FL01, normal temperature flowmeter; HT01, 2K gas heater; Pump4, throttling pressure reducing pump group. . DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Before introducing the platform for horizontal temperature testing of radio frequency superconducting cavities, the thermostat 200 is introduced first. The thermostat 200 is the core cold mass module integrated system of the superconducting accelerator, which includes key components such as superconducting cavities, couplers, superconducting solenoids and current leads, and is responsible for the core task of particle acceleration. Due to its complex internal structure and high integration, each component must operate normally under its own design conditions. Therefore, before formal installation and operation, a horizontal test must be carried out, that is, to evaluate the stability performance of the system under specific conditions. This test can discover potential problems, collect important data, and verify performance indicators. At present, the thermostat design and cold mass process solutions of various superconducting accelerators are different. It is particularly urgent to develop a horizontal test system suitable for different thermostats 200 and conduct multi-temperature zone and high stability experimental research. This will provide a reliable experimental system for the horizontal testing of thermostats of different types of superconducting accelerators, ensuring their efficient and stable operation in practical applications.

[0022] like Figure 3 As shown, the platform for horizontal temperature testing of radio frequency superconducting cavity includes horizontal test valve box 100, multiple return air pipelines, multiple air inlet pipelines, negative pressure heat exchanger HX01, negative pressure protection and safety relief integrated device, horizontal test valve box vacuum acquisition equipment, thermostat vacuum acquisition equipment and replacement pump group Pump3, wherein the negative pressure heat exchanger HX01, multiple return air pipelines and multiple air inlet pipelines are arranged in the horizontal test valve box 100, multiple return air pipelines and multiple air inlet pipelines are all provided with low temperature valves, pressure sensors and temperature sensors, the input end of the return air pipeline is connected to the corresponding thermostat 200 output The output end is connected, the output end of the return air pipeline is connected to the distribution and transmission system 300; the input end of the intake pipeline is connected to the distribution and transmission system 300, the output end of the intake pipeline is connected to the corresponding input end of the thermostat 200, the negative pressure heat exchanger HX01 is connected in series to one of the return air pipelines and one of the intake air pipelines, the negative pressure protection and safety discharge integrated device is connected to the distribution and transmission system 300, the return air pipeline, the replacement pump group Pump3 and the thermostat 200; the horizontal test valve box vacuum acquisition device is connected to the horizontal test valve box 100, and the thermostat vacuum acquisition device is connected to the thermostat 200.

[0023] The platform for horizontal temperature testing of a radio frequency superconducting cavity provided by the present invention can provide low-temperature cooling required for testing according to the design requirements of the radio frequency superconducting cavity and corresponding design parameters by arranging cryogenic valves, pressure sensors and temperature sensors on multiple return air pipelines and multiple air inlet pipelines, and can accurately obtain the working performance of the radio frequency superconducting cavity under the designed working conditions, test its comprehensive design indicators, and provide high-fidelity experimental data for the efficient and stable operation of the superconducting accelerator.

[0024] In one embodiment of the present invention, the horizontal test valve box 100 includes a vacuum cover VH01 and a horizontal test valve box cold shield assembly TS01, and the horizontal test valve box cold shield assembly TS01 is arranged inside the vacuum cover VH01. A tenth temperature sensor T10 is arranged inside the horizontal test valve box cold shield assembly TS01, and the tenth temperature sensor T10 is used to judge the cooling state of the cold shield. There are multiple tenth temperature sensors T10, specifically, there are six tenth temperature sensors T10, some of which are used during the test and the other parts are used as spares.

[0025] Furthermore, a first vacuum silicon VS01 is provided on the top of the vacuum cover VH01. The first vacuum silicon VS01 is electrically connected to the vacuum monitor. The first vacuum silicon VS01 is used to detect the vacuum state of the inner interlayer of the horizontal test valve box.

[0026] In one embodiment of the present invention, the horizontal test valve box vacuum obtaining equipment includes a first gate valve BV01 located on the top of the vacuum cover VH01, and a first replacement pump assembly Pump1 located on the ground foundation, the first gate valve BV01 is connected to the first replacement pump assembly Pump1 through a flange, and the first replacement pump assembly Pump1 includes a primary mechanical pump and a secondary molecular pump.

[0027] In one embodiment of the present invention, a second vacuum silicon VS02 is arranged on the top cover plate of the thermostat 200, and the second vacuum silicon VS02 is electrically connected to the vacuum monitor, and the second vacuum silicon VS02 is used to detect the vacuum state of the thermostat interlayer. The high-precision temperature sensor, high-precision positive pressure sensor, high-precision negative pressure sensor, 4.5K liquid helium level gauge, 2K superfluid helium level gauge signal, solid contact heater and built-in low-temperature valve controller inside the thermostat 200 are all connected to the control integration system for collecting signals and controlling the controller.

[0028] In one embodiment of the present invention, the thermostat vacuum obtaining device includes a second gate valve BV02 and a second displacement pump assembly Pump2. The second gate valve BV02 is arranged on the top cover plate of the thermostat 200. The second gate valve BV02 is connected to the second displacement pump assembly Pump2 through a flange. The second displacement pump assembly Pump2 includes a primary mechanical pump and a secondary molecular pump.

[0029] In one embodiment of the present invention, the plurality of return air pipelines include a first return air pipeline L1, a second return air pipeline L2, and a third return air pipeline L3, and the plurality of intake air pipelines include a first intake air pipeline L4 and a second intake air pipeline L5. The input end of the first return air pipeline L1 is connected to the output end of the corresponding thermostat 200, and the output end of the first return air pipeline L1 is connected to the cold screen return air pipeline L12 of the distribution and transmission system 300. The input end of the second return air pipeline L2 is connected to the output end of the corresponding thermostat 200, and the output end of the second return air pipeline L2 is connected to the coupler return air pipeline L10 of the distribution and transmission system 300. The input end of the third return air pipeline L3 is connected to the output end of the corresponding thermostat 200, and the output end of the third return air pipeline L3 is connected to the 2K return air pipeline L11 of the distribution and transmission system 300. The input end of the first air intake pipeline L4 is connected to the 4.5K air supply pipeline L14 of the distribution and transmission system 300, and the output end of the first air intake pipeline L4 is connected to the corresponding input end of the thermostat 200. The input end of the second air intake pipeline L5 is connected to the cold shield air supply pipeline L13 of the distribution and transmission system 300, and the output end of the second air intake pipeline L5 is connected to the corresponding input end of the thermostat 200.

[0030] In one embodiment of the present invention, the negative pressure heat exchanger HX01 is located inside the horizontal test valve box 100, and the first input port and the first output port of the negative pressure heat exchanger HX01 are connected in series to the third return air pipeline L3. Specifically, the third return air pipeline L3 is a helium pipeline, and the first input port of the negative pressure heat exchanger HX01 is connected to the output port of the thermostat 200 through the third return air pipeline L3, and the first output port of the negative pressure heat exchanger HX01 is connected to the 2K return air pipeline L11 of the distribution and transmission system 300 through the third return air pipeline L3.

[0031] The second input port and the second output port of the negative pressure heat exchanger HX01 are connected in series to the first air inlet pipeline L4. Specifically, the second output port of the negative pressure heat exchanger HX01 is connected to the input end of the thermostat 200 through the first air inlet pipeline L4, and the second input port of the negative pressure heat exchanger HX01 is connected to the 4.5K@3bar supercritical helium pipeline from the refrigerator system through the first air inlet pipeline L4, that is, connected to the 4.5K air supply pipeline L14 of the distribution and transmission system 300.

[0032] Before the supercritical helium gas at 4.5K@3bar enters the thermostat 200 via the negative pressure heat exchanger HX01, it passes through the sixth cryogenic valve CV06. The sixth cryogenic valve CV06 and the seventh cryogenic valve CV07 are pneumatic Joule-Thomson throttle valves (JT valves).

[0033] Furthermore, in the 2K mode, the negative pressure heat exchanger HX01 cooperates with the sixth cryogenic valve CV06 and the superfluid helium decompression and cooling pump group to complete throttling and decompression.

[0034] In one embodiment of the present invention, the first return air pipeline L1 is provided with a sixteenth cryogenic valve CV16, a fifth pressure sensor P5 and a sixth temperature sensor T6, wherein the sixth temperature sensor T6 is located between the sixteenth cryogenic valve CV16 and the fifth pressure sensor P5; the second return air pipeline L2 is provided with a thirteenth cryogenic valve CV13, a sixth pressure sensor P6 and a seventh temperature sensor T7, wherein the seventh temperature sensor T7 is located between the thirteenth cryogenic valve CV13 and the sixth pressure sensor P6; the third return air pipeline L3 is provided with a tenth cryogenic valve CV10, an eleventh cryogenic valve CV11, a first pressure sensor P1, a second pressure sensor P2, a first temperature sensor T1, a second temperature sensor T2 and an eighth temperature sensor T8, wherein the eleventh cryogenic valve CV11 is located between the eighth temperature sensor T8 and the first output port of the negative pressure heat exchanger HX01, and the first temperature sensor T1 and the first pressure sensor The first air intake pipeline L4 is provided with a sixth cryogenic valve CV06, a third pressure sensor P3, a fourth pressure sensor P4, a third temperature sensor T3 and a fourth temperature sensor T4, wherein the fourth pressure sensor P4 and the fourth temperature sensor T4 are located between the sixth cryogenic valve CV06 and the second output port of the negative pressure heat exchanger HX01, and the third temperature sensor T3 is located between the third pressure sensor P3 and the second input port of the negative pressure heat exchanger HX01; the second air intake pipeline L5 is provided with a ninth cryogenic valve CV09, a seventh pressure sensor P7 and a fifth temperature sensor T5, wherein the seventh pressure sensor P7 is located between the ninth cryogenic valve CV09 and the fifth temperature sensor T5.

[0035] After the supercritical helium gas at 4.5K@3bar from the refrigeration system enters the horizontal test valve box 100, it is divided into two branches and enters the thermostat 200, namely, through the first air inlet pipeline L4 and the third air inlet pipeline L6. In the third air inlet pipeline L6, it flows into the thermostat 200 after passing through the seventh low-temperature valve CV07, and in the first air inlet pipeline L4, it flows through the negative pressure heat exchanger HX01 and then passes through the seventh low-temperature valve CV07 and flows into the thermostat 200.

[0036] Furthermore, the first pressure sensor P1 is a positive pressure high-precision pressure sensor, the second pressure sensor P2 is a negative pressure high-precision pressure sensor, and the third pressure sensor P3 and the fourth pressure sensor P4 are both positive pressure high-precision pressure sensors.

[0037] Furthermore, the horizontal test valve box 100 delivers the helium from the refrigeration system 50K into the horizontal test valve box cold shield assembly TS01 through the ninth cryogenic valve CV09, and then flows into the thermostat cold shield assembly through the second air inlet line L5. The return air flows through the fifteenth cryogenic valve CV15 and the sixteenth cryogenic valve CV16 and returns to the refrigeration system.

[0038] In one embodiment of the present invention, the first return air pipeline L1 between the sixth temperature sensor T6 and the sixteenth cryogenic valve CV16 is connected to the cooling return air pipeline L9 of the distribution and transmission system 300 through the fifteenth cryogenic valve CV15; the second return air pipeline L2 between the seventh temperature sensor T7 and the thirteenth cryogenic valve CV13 is connected to the cooling return air pipeline L9 of the distribution and transmission system 300 through the fourteenth cryogenic valve CV14; the third return air pipeline L3 between the eleventh cryogenic valve CV11 and the first pressure sensor P1 is connected to the cooling return air pipeline L9 of the distribution and transmission system 300 through the twelfth cryogenic valve CV12.

[0039] In this embodiment, the eighth cryogenic valve CV08 to the sixteenth cryogenic valve CV16 are all pneumatic regulating valves, the eleventh cryogenic valve CV11 and the twelfth cryogenic valve CV12 are connected in parallel, the thirteenth cryogenic valve CV13 and the fourteenth cryogenic valve CV14 are connected in parallel, and the fifteenth cryogenic valve CV15 and the sixteenth cryogenic valve CV16 are connected in parallel.

[0040] The horizontal test valve box 100 delivers the helium from the refrigeration system 50K into the horizontal test valve box cold shield assembly TS01 and the thermostat cold shield assembly through the ninth cryogenic valve CV09, and the return gas flows through the fifteenth cryogenic valve CV15 or the sixteenth cryogenic valve CV16 and returns to the refrigeration system.

[0041] In one embodiment of the present invention, the multiple intake pipelines also include a third intake pipeline L6 and a fourth intake pipeline L7, the input end of the third intake pipeline L6 is connected to the first intake pipeline L4 between the third pressure sensor P3 and the third temperature sensor T3, and the output end of the third intake pipeline L6 is connected to the corresponding input end of the thermostat 200; the third intake pipeline L6 is provided with a seventh low-temperature valve CV07, an eighth pressure sensor P8 and a ninth temperature sensor T9, and the eighth pressure sensor P8 is located between the seventh low-temperature valve CV07 and the ninth temperature sensor T9; the input end of the fourth intake pipeline L7 is connected to the first intake pipeline L4 between the third pressure sensor P3 and the third temperature sensor T3, and the output end of the fourth intake pipeline L7 is connected to the corresponding input end of the thermostat 200; the fourth intake pipeline L7 is provided with an eighth low-temperature valve CV08.

[0042] In one embodiment of the present invention, the second air intake pipeline L5 between the ninth cryogenic valve CV09 and the seventh pressure sensor P7 is provided with a first temperature mixer Mix1, and the input end of the first temperature mixer Mix1 is connected to the rewarming air supply pipeline L8 of the distribution and transmission system 300 through the sixth normal temperature pneumatic valve WV06; the third air intake pipeline L6 between the eighth pressure sensor P8 and the seventh cryogenic valve CV07 is provided with a second temperature mixer Mix2, and the second temperature mixer Mix2 is connected to the rewarming air supply pipeline L8 of the distribution and transmission system 300 through the second one-way valve VN02 and the seventh normal temperature pneumatic valve WV07 in sequence, and the tenth pressure sensor P10 and the switch valve PV01 are provided on the rewarming air supply pipeline L8 of the distribution and transmission system 300.

[0043] The high-pressure gas from the refrigerator system enters the first temperature mixer Mix1 through the sixth normal temperature pneumatic valve WV06, and enters the horizontal test valve box cold shield assembly TS01 after mixing with the helium from the ninth low temperature valve CV09. The high-pressure gas from the refrigerator system enters the second temperature mixer Mix2 after passing through the seventh normal temperature pneumatic valve WV07 and the second one-way valve VN02, and enters the thermostat 200 after mixing with the helium from the seventh low temperature valve CV07. Among them, the second one-way valve VN02 can effectively eliminate the influence of the thermoacoustic oscillation phenomenon generated in the temperature zone below 4.5K on the measurement of the eighth pressure sensor P8.

[0044] In one embodiment of the present invention, the first return air pipeline L1 is connected to the recovery and purification system through the first connecting pipeline, and the third first-level safety valve SV03 and the third bursting disc BP03 are arranged on the first connecting pipeline, and the first connecting pipeline between the third bursting disc BP03 and the first return air pipeline L1 is connected to the replacement pump group Pump3 through the third normal temperature pneumatic valve WV03; the second return air pipeline L2 is connected to the recovery and purification system through the second connecting pipeline, and the second first-level safety valve SV02 and the second bursting disc BP02 are arranged on the second connecting pipeline; the second connecting pipeline between the second bursting disc BP02 and the second return air pipeline L2 is connected to the replacement pump group Pump3 through the second normal temperature pneumatic valve WV02.

[0045] The platform includes a first negative pressure protection and safety discharge integrated device SVG01 and a second negative pressure protection and safety discharge integrated device SVG02. The air inlet of the first negative pressure protection and safety discharge integrated device SVG01 is connected to the third return air pipeline L3 through the first one-way valve VN01. The air supply port of the first negative pressure protection and safety discharge integrated device SVG01 is connected to the low-pressure branch L15 of the refrigerator system of the distribution and transmission system 300. The displacement air outlet of the first negative pressure protection and safety discharge integrated device SVG01 is connected to the displacement pump group Pump3 through the fourth normal temperature pneumatic valve WV04; the return air outlet of the first negative pressure protection and safety discharge integrated device SVG01 is connected to the third return air pipeline L3 through the first one-way valve VN01. The air outlet of the collection and purification is connected to the recovery and purification system, and is connected to the replacement pump group Pump3 through the first normal temperature pneumatic valve WV01; the air inlet of the second negative pressure protection and safety discharge integrated device SVG02 is connected to the thermostat 200, the negative pressure protection and safety discharge integrated device air supply port of the second negative pressure protection and safety discharge integrated device SVG02 is connected to the low-pressure branch L15 of the refrigerator system of the distribution and transmission system 300, and the replacement air outlet of the second negative pressure protection and safety discharge integrated device SVG02 is connected to the replacement pump group Pump3 through the fifth normal temperature pneumatic valve WV05; the recovery and purification air outlet of the second negative pressure protection and safety discharge integrated device SVG02 is connected to the recovery and purification system. The replacement pump group Pump3 is used to evacuate the gas environment inside the replacement pipeline, and the replacement pump group Pump3 includes a primary mechanical pump and a secondary molecular pump.

[0046] By arranging the first one-way valve VN01 between the air inlet of the first negative pressure protection and safety relief integrated device SVG01 and the third air return line L3, the first one-way valve VN01 can prevent thermal acoustic shock below the 4.5K temperature range, thereby preventing the safety valve and bursting disc from operating at an incorrect pressure.

[0047] The first negative pressure protection and safety relief integrated device SVG01 encapsulates the first level-one safety valve SV01-1 inside, and the air outlet of the first negative pressure protection and safety relief integrated device SVG01 is connected to the first bursting disc BP01 through the first level-two safety valve SV01-2. The second negative pressure protection and safety relief integrated device SVG02 encapsulates the fourth level-one safety valve SV04-1 inside, and the air outlet of the second negative pressure protection and safety relief integrated device SVG02 is connected to the fourth bursting disc BP04 through the fourth level-two safety valve SV04-2.

[0048] like Figure 1 and Figure 2As shown, the present invention also provides a system for radio frequency superconducting cavity level temperature testing, the system includes a helium storage system, a refrigerator system, a distribution and transmission system 300, a superfluid helium acquisition system, a recovery and purification system, a control integration system, and a platform for radio frequency superconducting cavity level temperature testing as described in any of the above embodiments. Among them, the helium storage system is connected to the refrigerator system and the recovery and purification system, the refrigerator system is connected to the superfluid helium acquisition system and the distribution and transmission system 300, and the recovery and purification system is connected to the low temperature testing platform and the thermostat 200.

[0049] The helium storage system is a gas storage tank. The helium storage system includes 7 high-purity helium storage tanks, which contain high-pressure high-purity helium with a purity greater than 99.999% at about 8 bar, a low-purity helium storage tank, which stores helium from the recovery and purification system, and a liquid nitrogen storage tank, which contains 50Nm 3 Liquid nitrogen, necessary helium and liquid ammonia to maintain the operation of the entire superfluid helium cryogenic system; the helium storage system can perform high and low pressure stamping or pressure relief on the refrigerator system to maintain the stable operation of the refrigerator system.

[0050] The refrigerator system is a large-scale cryogenic equipment developed based on the Kraut cycle precooled by liquid nitrogen, including a compressor, oil removal and drying components, and a refrigerator cold box. The helium compressor can compress the low-pressure helium of 1.05 bar to 13 bar, and the oil removal and drying components remove oil and a small amount of water vapor and NO from the high-pressure helium from the helium compressor. x , H2, and O2 are then sent to the refrigerator cold box, which includes various levels of heat exchangers and turbines to expand and cool the high-pressure helium at 300K@13bar to supercritical helium at 4.5K@3.5bar.

[0051] The superfluid helium acquisition system includes a normal temperature flow meter FL01, a 2K gas heater HT01 and a throttling and decompression pump group Pump4 connected in series in sequence, which are used to achieve decompression and cooling to obtain superfluid helium of 2K@0.03bar. The throttling and decompression pump group Pump4 includes 4 sets of sub-pump groups, each of which contains a first-stage mechanical pump and a second-stage Roots pump, providing a decompression capacity of 2g / s under rated conditions. The maximum power of the 2K gas heater is 18kW. The gas is heated to room temperature and then sent to the throttling and decompression pump group Pump4. The normal temperature flow meter FL01 is used to adjust the start and stop control of the throttling and decompression pump group Pump4. The superfluid helium acquisition system is connected to the liquid helium return gas pipeline in the horizontal test valve box. After the superfluid helium acquisition system is turned on, the 4.5K@1.3bar liquid helium in the Dewar is prepared into 2K@0.03bar superfluid helium, and the withdrawn 2K gas is heated to room temperature and sent back to the refrigerator system; The recovery and purification system can recover and purify helium in the event of an emergency water or power outage, or when a safety valve trips or a bursting disc explodes, and deliver it to the helium storage system after reaching 99.999%.

[0052] The distribution and transmission system 300 includes a low-pressure branch line L15 of the refrigeration system, a normal temperature pipeline Ln and a multi-channel transmission pipeline Lm, wherein the normal temperature pipeline Ln includes a rewarming air supply pipeline L8 and a cooling return air pipeline L9, and the multi-channel transmission pipeline Lm includes a coupler return air pipeline L10, a 2K return air pipeline L11, a cold screen return air pipeline L12, a cold screen supply air pipeline L13 and a 4.5K supply air pipeline L14. The low-pressure branch L15 of the refrigerator system is provided with a fifth cryogenic valve CV05, the switch valve PV01 is located at one end of the rewarming air supply pipeline L8 close to the refrigerator system, the fourth cryogenic valve CV04 is provided at one end of the coupler return air pipeline L10 close to the refrigerator system, the third cryogenic valve CV03 is provided at one end of the cold screen return air pipeline L12 close to the refrigerator system, the second cryogenic valve CV02 is provided at one end of the cold screen supply air pipeline L13 close to the refrigerator system, and the first cryogenic valve CV01 is provided at one end of the 4.5K supply air pipeline L14 close to the refrigerator system.

[0053] The refrigerator system delivers 4.5K@3bar supercritical helium into the horizontal test valve box 100 through the 4.5K gas supply pipeline L14, delivers 50K@7bar low-temperature helium into the horizontal test valve box 100 through the cold shield gas supply pipeline L13, and the cold shield return gas of 75K@6bar is sent back to the refrigerator system through the cold shield return gas pipeline L12. In the 2K mode, the 2K gas from the thermostat 200 is sent into the superfluid helium acquisition system through the 2K return gas pipeline L11, and the cold shield return gas and the return gas from the thermostat 200 are sent back to the refrigerator system through the coupler return gas pipeline L10; the refrigerator system delivers 300K@4bar high-pressure helium into the first temperature mixer Mix1 through the sixth normal temperature pneumatic valve WV06 through the rewarming gas supply pipeline L8, and delivers it into the second temperature mixer Mix2 through the seventh normal temperature pneumatic valve WV07 and the second check valve VN02.

[0054] The refrigerator system delivers 300K@1.05bar normal temperature helium into the first negative pressure protection and safety relief integrated device SVG01 and the second negative pressure protection and safety relief integrated device SVG02 through the refrigerator system low-pressure branch L15 of the distribution transmission system 300, maintains a slightly positive pressure environment in the negative pressure protection and safety relief integrated device, and prevents air from invading the refrigerator system through the safety valve.

[0055] The control integration system is electrically connected to all temperature sensors, positive pressure sensors, negative pressure sensors, 4.5K liquid helium level gauges, 2K superfluid helium level gauges, fluid contact DC power heaters, solid contact DC power heaters, cryogenic valves, flow meters, normal temperature valves, plug valves, horizontal test valve box vacuum acquisition equipment, thermostat vacuum acquisition equipment, displacement pump sets, sensors and controllers for superconducting cavity vertical testing. The controller integration system includes automatic control of the controller and data acquisition units for various sensors.

[0056] The present invention also provides a method for using a system for horizontal temperature testing of a radio frequency superconducting cavity, comprising: Step S1, vacuuming the horizontal test valve box by using a horizontal test valve box vacuum acquisition device, and vacuuming the thermostat by using a thermostat vacuum acquisition device, so that the horizontal test valve box and the thermostat maintain a vacuum of 1×10 -4 Vacuum state of Pa magnitude; Step S1 specifically includes: closing all valves except the first plug valve BV01 and the second plug valve BV02, activating the first displacement pump assembly Pump1 of the horizontal test valve box vacuum acquisition equipment, and the second displacement pump assembly Pump2 of the thermostat vacuum acquisition equipment, and observing the feedback data of the first vacuum silicon VS01 located on the top of the vacuum chamber of the horizontal test valve box and the second vacuum silicon VS02 on the top cover of the thermostat 200, so that the interlayer vacuum of the horizontal test valve box 100 and the thermostat 200 is maintained at 1×10 -4 Vacuum state of Pa order.

[0057] Step S2, open the sixth cryogenic valve CV06 to the sixteenth cryogenic valve CV16, the first normal temperature pneumatic valve WV01 to the fifth normal temperature pneumatic valve WV05 and the replacement pump group Pump3 to evacuate the multiple return air pipelines and multiple air intake pipelines in the distribution transmission system 300 and the horizontal test valve box 100; obtain the values ​​of the first pressure sensor P1 to the ninth pressure sensor P9, and when the maximum value of the values ​​of the first pressure sensor P1 to the ninth pressure sensor P9 is lower than 100Pa, close the valve. Change the pump group Pump3 and the first normal temperature pneumatic valve WV01 to the fifth normal temperature pneumatic valve WV05; then open the switch valve PV01, the sixth normal temperature pneumatic valve WV06 and the seventh normal temperature pneumatic valve WV07, and slowly inject 300K helium into the pipeline. When the maximum value of the values ​​of the first pressure sensor P1 to the ninth pressure sensor P9 reaches 1.5 bar, close the switch valve PV01, the sixth normal temperature pneumatic valve WV06 and the seventh normal temperature pneumatic valve WV07, and let it stand for the first predetermined time; It should be noted that the first predetermined time in this embodiment is 15 minutes. After completing step S2, the helium gas is fully diffused into each pipeline, completing a gas replacement process in the pipeline.

[0058] Step S3, repeating step S2 multiple times to ensure the replacement effect; It should be noted that, in this embodiment, step S2 is repeated five times. Of course, the number of repetitions is not limited to five times, and may also be four times, six times or more times.

[0059] Step S4, open the ninth cryogenic valve CV09 and the fifteenth cryogenic valve CV15, and maintain the opening of the fifteenth cryogenic valve CV15 at more than 90%, gradually increase the opening of the second cryogenic valve CV02 and the ninth cryogenic valve CV09, so as to cool down the cold shield components of the horizontal test valve box 100 and the thermostat 200, obtain the value of the sixth temperature sensor T6, and when the value of the sixth temperature sensor T6 stabilizes to 75K, open and slowly and gradually increase the opening of the sixteenth cryogenic valve CV16, and slowly close the fifteenth cryogenic valve CV15 to recover high cooling capacity; Step S5, open the first cryogenic valve CV01 and the fourteenth cryogenic valve CV14, then open the seventh cryogenic valve CV07, and gradually increase the opening of the seventh cryogenic valve CV07 to prepare 4.5K@1.3bar liquid helium; at the same time, open the sixth cryogenic valve CV06 and keep a small opening to cool the negative pressure heat exchanger HX01; Step S6, controlling the opening of the seventh cryogenic valve CV07 so that the value of the 4.5K liquid helium level gauge in the thermostat 200 is 95%, and limiting the minimum opening of the seventh cryogenic valve CV07 to 10%; Adjusting the minimum opening of the seventh cryogenic valve CV07 to 10% can prevent overpressure in the pipeline, which may cause the bursting disc to burst and the safety valve to trip.

[0060] Step S7, turning on the 2K gas heater of the superfluid helium acquisition system and preheating it for a second predetermined time to fully activate the heater; It should be noted here that the second scheduled time is 20 minutes. Of course, the second scheduled time is not limited thereto and is determined according to actual needs.

[0061] Step S8, open the superfluid helium decompression and cooling pump group of the superfluid helium acquisition system, slowly close the seventh cryogenic valve CV07, close the fourteenth cryogenic valve CV14, and then slowly open the thirteenth cryogenic valve CV13; gradually increase the opening of the sixth cryogenic valve CV06, start throttling and decompression, and obtain 2K@0.03bar superfluid helium; Step S9, when the 4.5K@1.3bar liquid helium in the thermostat 200 is converted into 2K@0.03bar superfluid helium, the opening of the sixth cryogenic valve CV06 is adjusted so that the value of the 2K superfluid helium level gauge is 95%, a 2K test is performed, and then the minimum opening of the sixth cryogenic valve CV06 is adjusted to 10%; Adjusting the minimum opening of the sixth cryogenic valve CV06 to 10% can prevent overpressure in the pipeline, causing the bursting disc to explode and the safety valve to trip. The required data are obtained by the control integrated system.

[0062] Step S10, after the test is completed, open the fourteenth cryogenic valve CV14, close the thirteenth cryogenic valve CV13 and the superfluid helium acquisition system, and slowly close the first cryogenic valve CV01 and the second cryogenic valve CV02 to stop delivering cold energy to the horizontal test valve box 100 and the thermostat 200; Step S11, turning on the solid contact DC power heater in the thermostat 200, and controlling the power of the solid contact DC power heater to be within a predetermined range; when the value of the temperature sensor around the solid contact DC power heater reaches 70K, turning off the solid contact DC power heater; It should be noted here that, in this embodiment, the predetermined range is 80% of the full power. Of course, the second predetermined range is not limited thereto and is determined according to actual needs.

[0063] Step S12, open the switch valve PV01, the fifth normal temperature pneumatic valve WV05 and the sixth normal temperature pneumatic valve WV06, and input 300K normal temperature into the horizontal test valve box 100 and the thermostat 200 to accelerate the re-warming speed; Step S13, when the value of the temperature sensor around the solid contact DC power heater reaches normal temperature, the vacuum pump group of the horizontal test valve box vacuum obtaining device and the thermostat vacuum obtaining device is turned off.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A platform for horizontal temperature testing of radio frequency superconducting cavities, characterized in that: It includes a horizontal test valve box, multiple return air pipelines, multiple intake air pipelines, a negative pressure heat exchanger, a negative pressure protection and safety discharge integrated device, a horizontal test valve box vacuum acquisition device, a thermostat vacuum acquisition device and a replacement pump group, wherein the negative pressure heat exchanger, the multiple return air pipelines and the multiple intake air pipelines are arranged in the horizontal test valve box, the multiple return air pipelines and the multiple intake air pipelines are all provided with low temperature valves, pressure sensors and temperature sensors, the input end of the return air pipeline is connected to the corresponding thermostat output end, and the return air pipeline The output end is connected to the distribution transmission system; the input end of the air intake pipeline is connected to the distribution transmission system, the output end of the air intake pipeline is connected to the corresponding thermostat input end, the negative pressure heat exchanger is connected in series to one of the return air pipelines and one of the air intake pipelines, the negative pressure protection and safety discharge integrated device is connected to the distribution transmission system, the return air pipeline, the replacement pump group and the thermostat; the horizontal test valve box vacuum acquisition device is connected to the horizontal test valve box, and the thermostat vacuum acquisition device is connected to the thermostat; The multiple return air pipelines include: A first air return pipeline, wherein an input end of the first air return pipeline is connected to an output end of a corresponding thermostat, and an output end of the first air return pipeline is connected to a cold screen air return pipeline of the distribution and transmission system; a second air return pipeline, wherein an input end of the second air return pipeline is in communication with a corresponding thermostat output end, and an output end of the second air return pipeline is in communication with a coupler air return pipeline of the distribution transmission system; A third air return pipeline, wherein the input end of the third air return pipeline is connected to the corresponding thermostat output end, and the output end of the third air return pipeline is connected to the 2K air return pipeline of the distribution transmission system; The plurality of air intake lines include: A first air intake pipeline, wherein an input end of the first air intake pipeline is connected to a 4.5K air supply pipeline of the distribution and transmission system, and an output end of the first air intake pipeline is connected to a corresponding thermostat input end; A second air intake pipeline, wherein the input end of the second air intake pipeline is connected to the cold screen air supply pipeline of the distribution and transmission system, and the output end of the second air intake pipeline is connected to the corresponding thermostat input end.

2. The platform for high temperature testing of radio frequency superconducting cavity according to claim 1, characterized in that: The first input port and the first output port of the negative pressure heat exchanger are connected in series to the third return air pipeline, and the second input port and the second output port of the negative pressure heat exchanger are connected in series to the first intake air pipeline.

3. The platform for high temperature testing of radio frequency superconducting cavity according to claim 2, characterized in that: The first return air pipeline is provided with a sixteenth cryogenic valve, a fifth pressure sensor and a sixth temperature sensor, wherein the sixth temperature sensor is located between the sixteenth cryogenic valve and the fifth pressure sensor; the second return air pipeline is provided with a thirteenth cryogenic valve, a sixth pressure sensor and a seventh temperature sensor, wherein the seventh temperature sensor is located between the thirteenth cryogenic valve and the sixth pressure sensor; the third return air pipeline is provided with a tenth cryogenic valve, an eleventh cryogenic valve, a first pressure sensor, a second pressure sensor, a first temperature sensor, a second temperature sensor and an eighth temperature sensor, wherein the eleventh cryogenic valve is located between the eighth temperature sensor and the first output port of the negative pressure heat exchanger, and the first temperature sensor and the first pressure sensor are located between the eighth temperature sensor and the first output port of the negative pressure heat exchanger The eleventh cryogenic valve is located between the first output port of the negative pressure heat exchanger, and the second pressure sensor and the second temperature sensor are located between the tenth cryogenic valve and the first input port of the negative pressure heat exchanger; the first air intake pipeline is provided with a sixth cryogenic valve, a third pressure sensor, a fourth pressure sensor, a third temperature sensor and a fourth temperature sensor, wherein the fourth pressure sensor and the fourth temperature sensor are located between the sixth cryogenic valve and the second output port of the negative pressure heat exchanger, and the third temperature sensor is located between the third pressure sensor and the second input port of the negative pressure heat exchanger; the second air intake pipeline is provided with a ninth cryogenic valve, a seventh pressure sensor and a fifth temperature sensor, wherein the seventh pressure sensor is located between the ninth cryogenic valve and the fifth temperature sensor.

4. The platform for high temperature testing of radio frequency superconducting cavity according to claim 3, characterized in that: The first return air pipeline between the sixth temperature sensor and the sixteenth cryogenic valve is connected to the cooling return air pipeline of the distribution and transmission system through the fifteenth cryogenic valve; the second return air pipeline between the seventh temperature sensor and the thirteenth cryogenic valve is connected to the cooling return air pipeline of the distribution and transmission system through the fourteenth cryogenic valve; the third return air pipeline between the eleventh cryogenic valve and the first pressure sensor is connected to the cooling return air pipeline of the distribution and transmission system through the twelfth cryogenic valve.

5. The platform for high temperature testing of radio frequency superconducting cavity according to claim 3, characterized in that: The plurality of air intake lines also include: a third air intake pipeline, wherein an input end of the third air intake pipeline is in communication with the first air intake pipeline between the third pressure sensor and the third temperature sensor, and an output end of the third air intake pipeline is in communication with a corresponding thermostat input end; the third air intake pipeline is provided with a seventh cryogenic valve, an eighth pressure sensor and a ninth temperature sensor, and the eighth pressure sensor is located between the seventh cryogenic valve and the ninth temperature sensor; A fourth air intake pipeline, wherein the input end of the fourth air intake pipeline is connected to the first air intake pipeline between the third pressure sensor and the third temperature sensor, and the output end of the fourth air intake pipeline is connected to the corresponding thermostat input end; and the fourth air intake pipeline is provided with an eighth low-temperature valve.

6. The platform for high temperature testing of radio frequency superconducting cavity according to claim 5, characterized in that: The second air inlet pipeline between the ninth cryogenic valve and the seventh pressure sensor is provided with a first temperature mixer, and the input end of the first temperature mixer is connected to the re-temperature air supply pipeline of the distribution and transmission system through a sixth normal temperature pneumatic valve; The third air intake pipeline between the eighth pressure sensor and the seventh low-temperature valve is provided with a second temperature mixer, and the second temperature mixer is connected to the rewarming air supply pipeline of the distribution and transmission system through a second one-way valve and a seventh normal temperature pneumatic valve in sequence, and the rewarming air supply pipeline of the distribution and transmission system is provided with a tenth pressure sensor and a switch valve.

7. The platform for high temperature testing of radio frequency superconducting cavity according to claim 5, characterized in that: The first return air pipeline is connected to the recovery and purification system through a first connecting pipeline, a third primary safety valve and a third bursting disc are provided on the first connecting pipeline, and the first connecting pipeline between the third bursting disc and the first return air pipeline is connected to the replacement pump group through a third normal temperature pneumatic valve; the second return air pipeline is connected to the recovery and purification system through a second connecting pipeline, a second primary safety valve and a second bursting disc are provided on the second connecting pipeline; the second connecting pipeline between the second bursting disc and the second return air pipeline is connected to the replacement pump group through a second normal temperature pneumatic valve; The platform includes a first negative pressure protection and safety relief integrated device and a second negative pressure protection and safety relief integrated device, the air inlet of the first negative pressure protection and safety relief integrated device is connected to the third air return pipeline through a first one-way valve, the air supply port of the first negative pressure protection and safety relief integrated device is connected to the low-pressure branch of the refrigerator system of the distribution and transmission system, the displacement air outlet of the first negative pressure protection and safety relief integrated device is connected to the displacement pump group through a fourth normal temperature pneumatic valve; the recovery and purification air outlet of the first negative pressure protection and safety relief integrated device is connected to the recovery and purification system; the pressure relief air outlet of the first negative pressure protection and safety relief integrated device is connected to the first bursting disc through the first and second level safety valves; The air inlet of the second negative pressure protection and safety relief integrated device is connected to the thermostat, the air supply port of the second negative pressure protection and safety relief integrated device is connected to the low-pressure branch of the refrigeration system of the distribution and transmission system, and the displacement air outlet of the second negative pressure protection and safety relief integrated device is connected to the displacement pump group through the fifth normal temperature pneumatic valve; the recovery and purification air outlet of the second negative pressure protection and safety relief integrated device is connected to the recovery and purification system, and the pressure relief air outlet of the second negative pressure protection and safety relief integrated device is connected to the fourth bursting disc through the fourth secondary safety valve.

8. A system for horizontal temperature testing of radio frequency superconducting cavities, characterized in that: The system comprises a helium storage system, a refrigerator system, a distribution and transmission system, a superfluid helium acquisition system, a recovery and purification system, a control integration system and a platform for horizontal temperature testing of a radio frequency superconducting cavity as claimed in any one of claims 1 to 7.

9. A method for using a system for horizontal temperature testing of a radio frequency superconducting cavity, characterized in that: include: Step S1, vacuuming the horizontal test valve box by using a horizontal test valve box vacuum acquisition device, and vacuuming the thermostat by using a thermostat vacuum acquisition device, so that the horizontal test valve box and the thermostat maintain a vacuum of 1×10 -4 Vacuum state of Pa magnitude; Step S2, open the sixth cryogenic valve to the sixteenth cryogenic valve, the first normal temperature pneumatic valve to the fifth normal temperature pneumatic valve and the replacement pump group to evacuate multiple return air pipelines and multiple air intake pipelines in the distribution transmission system and the horizontal test valve box; obtain the values ​​of the first pressure sensor to the ninth pressure sensor, and when the maximum value of the values ​​of the first pressure sensor to the ninth pressure sensor is lower than 100Pa, close the replacement pump group and the first normal temperature pneumatic valve to the fifth normal temperature pneumatic valve; then open the switch valve, the sixth normal temperature pneumatic valve and the seventh normal temperature pneumatic valve, and slowly inject 300K helium into the pipeline. When the maximum value of the values ​​of the first pressure sensor to the ninth pressure sensor reaches 1.5bar, close the switch valve, the sixth normal temperature pneumatic valve and the seventh normal temperature pneumatic valve, and let it stand for a first predetermined time; Step S3, repeating step S2 multiple times to ensure the replacement effect; Step S4, open the ninth cryogenic valve and the fifteenth cryogenic valve, and maintain the opening of the fifteenth cryogenic valve at more than 90%, gradually increase the opening of the second cryogenic valve and the ninth cryogenic valve to cool down the cold shield components of the horizontal test valve box and the thermostat, obtain the value of the sixth temperature sensor, and when the value of the sixth temperature sensor stabilizes to 75K, open and slowly and gradually increase the opening of the sixteenth cryogenic valve, and slowly close the fifteenth cryogenic valve; Step S5, opening the first cryogenic valve and the fourteenth cryogenic valve, and then opening the seventh cryogenic valve, and gradually increasing the opening of the seventh cryogenic valve to prepare 4.5K@1.3bar liquid helium; at the same time, opening the sixth cryogenic valve and maintaining a small opening to cool the negative pressure heat exchanger; Step S6, controlling the opening of the seventh cryogenic valve so that the value of the 4.5K liquid helium level gauge in the thermostat is 95%, and limiting the minimum opening of the seventh cryogenic valve to 10%; Step S7, turning on the 2K gas heater of the superfluid helium acquisition system and preheating it for a second predetermined time to fully activate the heater; Step S8, start the superfluid helium decompression and cooling pump group of the superfluid helium acquisition system, slowly close the seventh cryogenic valve, close the fourteenth cryogenic valve, and then slowly open the thirteenth cryogenic valve; gradually increase the opening of the sixth cryogenic valve, start throttling and decompression, and obtain 2K@0.03bar superfluid helium; Step S9, when the 4.5K@1.3bar liquid helium in the thermostat is converted into 2K@0.03bar superfluid helium, the opening of the sixth cryogenic valve is adjusted so that the value of the 2K superfluid helium level gauge is 95%, a 2K test is performed, and then the minimum opening of the sixth cryogenic valve is adjusted to 10%; Step S10, after the test is completed, open the fourteenth cryogenic valve, close the thirteenth cryogenic valve and the superfluid helium acquisition system, and slowly close the first cryogenic valve and the second cryogenic valve to stop supplying cold to the horizontal test valve box and the thermostat; Step S11, turning on the solid contact DC power heater in the thermostat, and controlling the power of the solid contact DC power heater to be within a predetermined range; when the value of the temperature sensor around the solid contact DC power heater reaches 70K, turning off the solid contact DC power heater; Step S12, opening the switch valve, the fifth normal temperature pneumatic valve and the sixth normal temperature pneumatic valve, and inputting 300K normal temperature helium into the horizontal test valve box and the thermostat to accelerate the rewarming speed; Step S13, when the value of the temperature sensor around the solid contact DC power heater reaches normal temperature, the vacuum pump group of the horizontal test valve box vacuum obtaining device and the thermostat vacuum obtaining device is turned off.

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