83 results about "Superconducting cavity" patented technology

The invention provides a single / double-module energy-adjustable superconducting electron accelerator device, a medical isotope production system and a medical isotope production method, and the device comprises an injection system which is used for generating an electron beam current with certain energy and current intensity; the acceleration module system comprises single or double parallel acceleration modules, and each acceleration module comprises a superconducting cavity and a low-temperature unit; the low-temperature unit comprises a refrigerator, a high-thermal-conductivity cold chain, and a cold shield and a vacuum shell which sequentially cover the periphery; the radio frequency system is used for feeding microwave power into the superconducting cavity, maintaining the amplitude and phase stability of an electromagnetic field and accurately compensating the frequency deviation of the superconducting cavity; and the electron motion trail control system is used for guiding the electron beam to pass through the acceleration module and the plurality of circulating transmission pipelines with the corner radiuses sequentially enlarged for multiple times. The technical problems that an existing accelerator is limited by serious heating and cannot achieve high-flow-intensity and high-energy operation, a low-temperature cooling system is complex, so that the operation and maintenance cost is high, high energy and high flow intensity cannot be considered at the same time, and medical isotope production is difficult to meet are solved.

The invention provides a single-module double-cavity parallel superconducting electron accelerator device, a medical isotope production system and a medical isotope production method, and the device comprises an injection system which is used for generating an electron beam current with certain energy and current intensity; the acceleration module system comprises a low-temperature unit and a superconducting cavity; the low-temperature unit comprises a refrigerator, a high-thermal-conductivity cold chain, and a cold shield and a vacuum shell which sequentially cover the periphery; the refrigerating machine is connected with the superconducting cavity through a high-thermal-conductivity cold chain; the radio frequency system is used for feeding microwave power into each superconducting cavity, maintaining the amplitude and phase stability of an electromagnetic field and accurately compensating the frequency deviation of the superconducting cavity; and the electronic motion trail control system is used for guiding the electronic beam current to pass through the double parallel superconducting cavities and a plurality of circulating transmission pipelines of which the corner radiuses are sequentially enlarged for multiple times. The technical problems that an existing accelerator is limited by serious heating and cannot achieve high-flow-intensity and high-energy operation, a low-temperature cooling system is complex, so that the operation and maintenance cost is high, high energy and high flow intensity cannot be considered at the same time, and medical isotope production is difficult to meet are solved.

The invention relates to the technical field of superconducting accelerators, in particular to a solid conduction cooling structure for a superconducting radio frequency cavity. Comprising a double-cell superconducting cavity body, an equator cold ring, a beam tube cold ring and a thermal bridge structure, and through the ingenious design of the equator cold ring, the beam tube cold ring and the thermal bridge structure and the adoption of oxygen-free copper and other materials with good heat conduction performance and mechanical strength, the efficient and uniform cooling effect is achieved, and the service life of the double-cell superconducting cavity is prolonged. Powerful support is provided for miniaturization and industrial application of the radio frequency superconducting technology; according to the invention, stable operation of the superconducting cavity at a proper low temperature can be realized by adopting a commercial refrigerator, a complex thermostat design, an expensive and huge helium liquefaction low-temperature station and a specialized low-temperature station operation and maintenance team are omitted, and the application difficulty of a radio frequency superconducting technology is reduced; the method has natural advantages in miniaturization and industrial application of the radio frequency superconducting technology.

The application discloses a precision superconducting cavity processing and detecting system and a die forging process, which comprises a turret type die automatic switching device, a die forging equipment, a superconducting cavity special die and a superconducting cavity deformation detecting device; the turret type die automatic switching device is used for carrying the superconducting cavity special die; the die forging equipment is used for die forging a blank placed in the superconducting cavity special die; and the superconducting cavity deformation detecting device is used for detecting the punched superconducting cavity after die forging; the superconducting cavity deformation detecting device comprises a base, a control box is arranged in the base, and a superconducting cavity supporting convex block for placing the punched superconducting cavity is arranged on the base; the superconducting cavity supporting convex block comprises a body, and a first strain detecting ring, a second strain detecting ring, a third strain detecting ring, a fourth strain detecting ring and a fifth strain detecting ring are sequentially arranged on the body. The application has the advantages of improving product quality and reducing production cost.

The invention discloses a radio frequency superconducting material performance testing system and a surface resistance measuring method.The radio frequency superconducting material performance testing system comprises a radio frequency cavity module, a low temperature module and a measuring module, the radio frequency cavity module comprises a mushroom-shaped superconducting cavity, the inner wall of the superconducting cavity is plated with a Ni3tin film, and the inner wall of the superconducting cavity is plated with a Ni3tin film; the low-temperature module is provided with a multi-stage cooling structure and a magnetic shielding shell. The measuring module is used for collecting the sample temperature, the magnetic field, the vacuum degree, the radio frequency power and the direct-current power of the heater. According to the radio frequency superconducting material performance testing system, by optimizing the design of the mushroom-shaped cavity and adopting the Nb3Sn coating technology and the efficient conduction cooling low-temperature module, the dependence of a traditional radio frequency material testing system on a liquid helium low-temperature system is eliminated, a compact testing platform is formed, and high-field and high-resolution measurement of the surface resistance of an SRF material is achieved.

The utility model provides a superconducting electron linear accelerator device for isotope production, which comprises an injector, a superconducting acceleration module and an irradiation target area which are arranged in sequence, and the superconducting acceleration module is connected with a low-temperature cooling system, a radio frequency driving system and a control system; the superconducting acceleration module comprises a low-beta-value Ni3Sn superconducting cavity and five standard Ni3Sn superconducting cavity modules, the low-beta-value superconducting cavity is an SRF acceleration cavity of a 2-cell cavity with beta = 0.7, and each standard superconducting cavity module consists of four SRF acceleration cavities of the 2-cell cavity with beta = 1 which are connected in series; and the input end of the standard superconducting cavity module adopts a symmetrical double-input coupler. According to the linear accelerator device provided by the utility model, the Ni3Sn superconducting cavity adopts a 2-cell and double-input coupler structure, so that the power requirement of high-power input coupling can be reduced under high flow intensity, a high-power electron beam is generated at lower cost, and efficient and economic production of isotopes is realized.

The utility model relates to a high-pressure flushing device for a superconducting cavity, which comprises a bearing assembly, a first flushing assembly and a second flushing assembly, the in-place detection assembly is mounted on one side of the bearing assembly; the in-place detection assembly comprises a first lifting linear module, a supporting plate, a floating ring, a first sensor, a probing ring and a second sensor; the flushing assembly is mounted on the other side of the bearing assembly; the flushing assembly comprises a second lifting linear module, a hollow rotating motor, a spraying rod and a water inlet pipe; and the top end of the spraying rod is used for coaxially penetrating through the probing ring. The superconductive cavity high-pressure flushing device is simple in structure and convenient to use, whether a superconductive cavity is installed in place or not is detected through the synergistic effect of the floating ring and the probing ring, the spraying rod stretches into the superconductive cavity and conducts 360-degree rotary flushing, the superconductive cavity high-pressure flushing device can adapt to a high-curvature curved surface and a deep narrow cavity channel of the superconductive cavity, the cleaning coverage rate is greatly increased, and the cleaning efficiency is improved. And residues on the inner wall of the superconducting cavity are effectively and thoroughly removed.

The utility model relates to the technical field of cleaning nozzles, and discloses a superconducting cavity HPR cleaning nozzle installation structure which comprises an installation frame, installation plates are connected to the four corners of one side of the upper surface of the installation frame through bolts, and branch pipes are connected to the upper ends of the installation plates through bolts. The lower end of the branch pipe penetrates through the mounting plate to the outside of the mounting plate and is in bolted connection with a mounting ring, the inner wall of one side of the upper part of the mounting frame is fixedly connected with a mounting turntable, and the upper end of the branch pipe is in bolted connection with a connecting ring. When the superconductive cavity HPR cleaning nozzle mounting structure is used, the positioning ring is in bolted connection with the mounting turntable to determine the position of the spray rod, and the lower end of the spray rod is connected with the rotary joint through the joint, so that the mounting is convenient, and the smooth conveying of cleaning liquid is ensured; extra fixing points are provided for the spraying rod and cooperate with the positioning structure, and the stability of the spraying rod is enhanced.

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.

The application discloses a high-order mode coupler based on a double-inhibition structure of a transmission line model and a design method, and belongs to the accelerator physics and superconducting high-frequency technical field.The method comprises the following steps: determining a superconducting cavity base mode frequency, a high-order mode frequency band and an external quality factor Qe requirement; establishing an equivalent transmission line model comprising two parallel resonance base mode inhibition structures; optimizing a transmission curve through a normalized scattering matrix theory; converting the optimized transmission line model into a three-dimensional structure and further optimizing; modeling and calculating the external quality factor Qe in combination with the superconducting cavity; performing secondary electron multiplication effect simulation analysis; performing thermal load analysis by using an iterative process; and finally completing mechanical design.The application adopts the double-inhibition structure, greatly improves the base mode inhibition bandwidth, realizes deep inhibition of the base mode without pre-tuning, significantly reduces the superconducting module integration cost, improves the assembly efficiency and reduces the operation risk.

The embodiment of the specification discloses a coupling control method, device and equipment of an Xmon type superconducting quantum bit and a medium. The method comprises the following steps: coupling two ends of a half-wavelength superconducting cavity with Xmon type superconducting quantum bits based on capacitance, and embedding a superconducting quantum interference device at a middle position of the half-wavelength superconducting cavity, wherein the distance between the Xmon type superconducting quantum bits is greater than a preset threshold, so that the direct coupling between the Xmon type superconducting quantum bits is lower than a preset influence value; acquiring the frequency of each Xmon type superconducting quantum bit through a reading cavity connected with each Xmon type superconducting quantum bit; adjusting the frequency of an adjustable cavity mode of the half-wavelength superconducting cavity according to a preset magnetic flux applied to the superconducting quantum interference device; and controlling the indirect coupling of the Xmon type superconducting quantum bits by adjusting the frequency difference between the adjustable cavity mode of the half-wavelength superconducting cavity and each Xmon type superconducting quantum bit, so as to realize the indirect coupling or disconnection between the Xmon type superconducting quantum bits.

An HWR015 type superconducting cavity inner conductor end face turning machining method comprises the following steps that centering clamps are placed in the two ends of a workpiece to be machined, and a lathe chuck and a lathe tailstock tip are used for fixing the centering clamps; turning the right end face of the to-be-machined workpiece until the end face of the to-be-machined workpiece is integrally flat, and stopping feeding; turning the left end face of the to-be-machined workpiece, and stopping feeding until the end face of the to-be-machined workpiece is integrally flat; the theoretical removal amount Q1 of the left end face and the theoretical removal amount Q2 of the right end face of the workpiece to be machined are measured and calculated; turning the right end face of the to-be-machined workpiece, and stopping feeding until the feeding amount is consistent with the required feeding amount of the to-be-machined workpiece; turning the left end face of the to-be-machined workpiece, and stopping feeding until the feeding amount is consistent with the required feeding amount of the to-be-machined workpiece; and confirming that the cut removal amount of the end faces of the two sides of the workpiece is consistent with the theoretical removal amount Q1 and Q2, and completing turning. The planeness of the machining end face of the to-be-machined workpiece, the circle run-out of the end and the perpendicularity of the turning end face and the central axis are effectively guaranteed.

This invention discloses a composite superconducting cavity string reinforcing rib and a bidirectional frequency modulation method for the superconducting cavity string. The composite superconducting cavity string reinforcing rib of this invention is characterized by comprising two horizontal beams, two central vertical beams, four edge vertical beams, four connecting pressure plates, and four superconducting cavity lower flanges located in the same plane; a rectangular area is formed between the two horizontal beams by the two central vertical beams; two edge vertical beams are provided on the outer side of each horizontal beam; the four superconducting cavity lower flanges within the rectangular area are respectively connected and fixed to one side by a connecting pressure plate for connecting the superconducting cavity string; both ends of the horizontal beams have raised contact platforms as force points for contacting the end plate of the superconducting cavity liquid helium tank; the outer ends of the edge vertical beams have raised contact platforms as force points for connecting to the end plate of the superconducting cavity liquid helium tank; the superconducting cavity lower flanges have several threaded holes, the inner threaded holes for connection and fixation with the superconducting cavity small bundle tube flange, and the outer threaded holes for connection and fixation with the reinforcing ribs.

The application discloses a three-dimensional scanning-based superconducting cavity welding allowance precision judgment method and system, and the method comprises the following steps: obtaining actual surface point cloud data of a target welding area of a superconducting cavity to be welded based on three-dimensional scanning; the actual surface point cloud data comprises a plurality of measurement points; the actual surface point cloud data is matched with a preset theoretical model imported to obtain a matching result; the preset theoretical model comprises a plurality of corresponding points; based on the obtained matching result, the deviation value between the measurement points and the matched corresponding points is calculated, and a deviation value dataset is obtained; a visual deviation cloud map is generated according to the deviation value dataset; the deviation value dataset and the visual deviation cloud map are output; and qualified judgment is performed based on the deviation value dataset and / or the visual deviation cloud map. The application realizes automatic and digital detection, converts traditional contact measurement depending on manual experience into non-contact precision evaluation based on data driving, and improves detection efficiency and consistency of results.

The invention discloses a high-order mode coupler based on a transmission line model dual-suppression structure and a design method, and belongs to the technical field of accelerator physics and superconducting high frequency. The method comprises the following steps: determining the fundamental mode frequency, high-order mode frequency band and no-load quality factor Qe requirements of the superconducting cavity; establishing an equivalent transmission line model comprising two parallel resonant fundamental mode suppression structures; optimizing a transmission curve through a normalized scattering matrix theory; converting the optimized transmission line model into a three-dimensional structure and further optimizing the three-dimensional structure; carrying out overall modeling with the superconducting cavity to calculate a no-load quality factor Qe; secondary electron multiplication effect simulation analysis is carried out; carrying out thermal load analysis by adopting an iterative process; and finally, mechanical design is completed. The dual-suppression structure is adopted, the fundamental mode suppression bandwidth is greatly improved, deep suppression of a fundamental mode is achieved, pre-tuning is not needed, the integration cost of the superconducting module is remarkably reduced, the assembly efficiency is improved, and the operation risk is reduced.

The application discloses a high-order mode coupler with double-inhibiting structure and a manufacturing method thereof. The high-order mode coupler comprises an extraction component and a coupling component; the coupling component is provided with a coupling hook for deeply coupling electromagnetic field transmitted by a superconducting cavity and inputting the electromagnetic field to the extraction component; the extraction component is used for extracting the input electromagnetic field to a normal temperature zone; a first coupling capacitor is formed between the lower end of the coupling hook and the tube wall of the superconducting cavity tube for determining the frequency point of the base mode inhibition; a second coupling capacitor is formed between a T-shaped probe and the tube wall of the extraction component for adjusting the bandwidth of the base mode inhibition frequency point; a third coupling capacitor is formed between the bottom end of the inner conductor of the extraction component and the top end of the coupling hook for adjusting the transmission efficiency of electromagnetic field energy; the first coupling capacitor is a first inhibiting structure, and the LC resonant circuit composed of the T-shaped probe and the second coupling capacitor is a second inhibiting structure. The application solves the base mode tuning problem and the heating problem of the high-order mode coupler.

The application relates to the technical field of spectrum measurement, and discloses a method for characterizing the thickness of a superconducting cavity film of an accelerator, which comprises the following steps: focusing a laser pulse on the surface of a superconducting cavity film to be detected to form an excited micro area on the surface of the superconducting cavity film to be detected; performing single-point ablation on the excited micro area by multiple laser pulses, and recording a LIBS spectrum corresponding to each laser pulse; selecting a tracer element for each recorded LIBS spectrum, and extracting to-be-detected characteristic information according to a fingerprint spectrum line of the tracer element; measuring the ablation depth corresponding to each laser pulse; establishing a corresponding relationship between the to-be-detected characteristic information and the ablation depth; and establishing a thickness prediction model, which represents the thickness of the superconducting cavity film to be detected. The application has the technical effect of realizing convenient and nearly nondestructive characterization of the thickness of the superconducting cavity film of the accelerator.

The present invention discloses a radio frequency (RF) superconducting material performance testing system and surface resistance measurement method. The RF superconducting material performance testing system comprises an RF cavity module, a cryogenic module, and a measurement module. The RF cavity module includes a mushroom-shaped superconducting cavity with a niobium-tin thin film coated on its inner wall. The cryogenic module is equipped with a multi-stage cooling structure and a magnetic shielding shell. The measurement module is used to collect sample temperature, magnetic field, vacuum level, RF power, and heater DC power. By optimizing the mushroom-shaped cavity design, utilizing Nb3Sn coating technology, and a cryogenic module with efficient conduction cooling, this RF superconducting material performance testing system eliminates the reliance of traditional RF material testing systems on liquid helium cryogenic systems, creating a compact testing platform that enables high-field and high-resolution measurement of the surface resistance of SRF materials.

The invention relates to the field of superconducting cavity technology application, in particular to a superconducting cavity high-pressure jet cleaning simulation system developed based on an MATLAB software platform and an operation method of the superconducting cavity high-pressure jet cleaning simulation system. The system comprises a model import module, a parameter input module, a simulation calculation module and a result display module, efficient simulation is carried out on the superconducting cavity inner surface high-pressure flushing (HPR) process by utilizing an M-T algorithm, and the system aims at deeply researching the cleaning process and optimizing HPR process parameters, so that the performance and reliability of the superconducting cavity cleaning process are improved, and the service life of the superconducting cavity is prolonged. The device is especially suitable for batch cleaning production requirements before superconductive radio frequency cavities are assembled in an international linear collider (ILC) project. According to the technology, rapid simulation is achieved through a mathematical model, the calculation complexity is remarkably reduced compared with a traditional finite element method, and the method has the advantages of being efficient and accurate and saving resources.

The present invention provides a tuning device and a superconducting accelerator. The tuning device includes an elastic member, a fast tuning assembly, and a connecting bracket. The fast tuning assembly includes a piezoelectric ceramic, a first mounting seat, and a second mounting seat. The first mounting seat is used to connect and fix to the liquid helium tank of the superconducting cavity. The connecting bracket is connected to the second mounting seat and has an extrusion portion that acts on the beam port of the superconducting cavity in a first direction. The first mounting seat and the second mounting seat are slidably engaged along the first direction. The piezoelectric ceramic is fixedly mounted between the first mounting seat and the second mounting seat. The first direction is consistent with the axial direction of the piezoelectric ceramic. The two ends of the elastic member respectively transmit force to the first mounting seat and the second mounting seat, so that the spacing between the first mounting seat and the second mounting seat is adaptively adjusted as the axial dimension of the piezoelectric ceramic changes. The tuning device has a simple mechanical structure and good tuning accuracy and adjustment response speed.

The application discloses a cavity processing method for RF superconducting accelerating cavity conduction cooling, and the steps of the method comprise the following steps: 1) depositing a niobium tri-tin film on the inner surface of a superconducting cavity, and vertically testing the obtained niobium tri-tin film cavity in liquid helium; 2) after cleaning and vacuumizing the niobium tri-tin film cavity, filling the inside with a protective gas; 3) performing sand blasting treatment on the outer surface of the superconducting cavity to facilitate copper powder deposition; 4) adopting a cold spraying process to coat copper on the outer surface of the superconducting cavity after sand blasting treatment, so as to form a cold sprayed copper layer; 5) performing mechanical polishing on the equatorial position of the superconducting cavity and the positions close to the ellipsoid part on both sides of the beam tube; 6) sleeving an oxygen-free copper hoop ring matched with the equatorial position of the superconducting cavity into the equator of the superconducting cavity, and fixing an oxygen-free copper hoop matched with the beam tube of the superconducting cavity on both beam tubes of the superconducting cavity; and 7) performing cold sprayed copper treatment on the oxygen-free copper hoop ring and the positions on both sides of the oxygen-free copper hoop of the superconducting cavity again, so as to form a secondary cold sprayed copper layer.

The present invention relates to the field of welding technology, specifically to an electron beam welding device and a control method thereof, comprising the steps of: obtaining an initial state of the welding device; obtaining a three-dimensional geometric model of a superconducting cavity, and generating an optimal welding path scheme based on the three-dimensional geometric model and the initial state of the welding device; obtaining parameter data for the welding device to control the movement of the superconducting cavity according to the optimal welding path scheme, and mapping it to the same time axis for synchronous processing to obtain a synchronous control signal, fusing the synchronous control signal with the optimal welding path scheme to obtain a control instruction for the welding device; controlling a welding workbench to weld the superconducting cavity, and during the welding process, controlling the welding device to move the superconducting cavity according to the control instruction until the welding is completed. The present application can significantly improve the accuracy, continuity and stability of electron beam welding by comprehensively controlling position calibration, path optimization and motion synchronization during the welding process.

The invention discloses a superconductive cavity welding allowance accurate judgment method and system based on three-dimensional scanning. The method comprises the following steps that actual surface point cloud data of a target welding area of a to-be-welded superconductive cavity is obtained based on three-dimensional scanning; the actual surface point cloud data comprises a plurality of measurement points; registering the actual surface point cloud data with an imported preset theoretical model to obtain a registration result; the preset theoretical model comprises a plurality of corresponding points; calculating a deviation value between the measurement point and the matched corresponding point based on the obtained registration result, and obtaining a deviation value data set; generating a visual deviation cloud picture according to the deviation value data set; outputting a deviation value data set and a visual deviation cloud picture; and carrying out qualification judgment based on the deviation value data set and / or the visual deviation cloud picture. According to the invention, automatic and digital detection is realized, traditional contact measurement depending on artificial experience is converted into non-contact precision evaluation based on data driving, and the detection efficiency and the result consistency are improved.

The invention discloses a superconducting cavity string assembly tool, and relates to the technical field of superconducting accelerator processing. The superconducting cavity string assembling tool comprises a bottom plate; the first supporting unit comprises a gate valve supporting mechanism, a beam tube supporting mechanism, a movable end supporting mechanism and a fixed end supporting mechanism, the gate valve supporting mechanism, the movable end supporting mechanism and the fixed end supporting mechanism are sequentially arranged in the first direction and are all installed on the same side of the bottom plate in a sliding mode in the first direction, and the beam tube supporting mechanism is installed on the gate valve supporting mechanism; the gate valve supporting mechanism is positioned on one side deviating from the movable end supporting mechanism; the second supporting unit is arranged on the side, away from the movable end supporting mechanism, of the fixed end supporting mechanism; the coupler supporting units are arranged on one side of the first supporting unit or the second supporting unit side by side in the second direction, and the second direction is perpendicular to the first direction. According to the superconducting cavity string assembling tool provided by the invention, the assembling efficiency of the superconducting cavity string assembling tool can be improved.

1. The name of the design product: graphical user interface with waveform monitoring for electronic device. 2. The use of the design product: the design product is used for running programs and displaying graphical user interfaces. 3. The design points of the design product: the content of the graphical user interface in the screen. 4. The picture or photo that best indicates the design points: front view. 5. The use of the graphical user interface: the graphical user interface of the design is used for superconducting cavity level test in the field of particle accelerators. Click the "human brain" icon next to the time in the upper right corner of the front view to enter the password input box of interface change state figure 1. Click the password input box of interface change state figure 1 and input the correct password, then click confirm to enter the expert interface of interface change state figure 2. Click "Trigger WF" in the lower right corner of interface change state figure 2 to enter interface change state figure 3. 6. Other circumstances that need to be explained: the electronic device of the design can be a computer, a notebook computer, a tablet computer, or a mobile phone.

This invention discloses an additive manufacturing method for a copper layer on the surface of a superconducting cavity, comprising the following steps: S1: preparing powdered brazing material; S2: depositing the brazing material onto the outer surface of the superconducting cavity by cold spraying in a solid-state molding manner to form a brazing layer, the thickness of which is 0.1-0.5 mm, and the surface of the superconducting cavity being a niobium layer; S3: electroplating copper onto the surface of the brazing layer to form a copper coating; S4: annealing the composite layer consisting of the niobium layer, the brazing layer, and the copper coating. This invention uses a high thermal conductivity brazing material to form a brazing layer on the outer surface of a superconducting cavity by cold spraying, and then electroplating a copper layer on the brazing layer, resulting in a composite coating on the outer surface of the superconducting cavity that is low in oxidation, resistant to cracking and delamination. The bonding strength between the copper layer, the brazing layer, and the niobium layer is high, while also giving the superconducting cavity excellent heat dissipation performance.

The invention relates to the technical field of spectral measurement, and discloses a method for characterizing the thickness of a superconducting cavity film of an accelerator, which comprises the following steps: focusing a laser pulse on the surface of the superconducting cavity film to be detected, and forming an excitation micro-area on the surface of the superconducting cavity film to be detected; performing single-point ablation of multiple laser pulses on the excitation micro-area, and recording an LIBS spectrum corresponding to each laser pulse; for each recorded LIBS spectrum, selecting a tracer element, and extracting to-be-detected feature information according to a fingerprint spectral line of the tracer element; the ablation depth corresponding to each laser pulse is measured; establishing a corresponding relationship between the to-be-detected feature information and the ablation depth; and establishing a thickness prediction model, wherein the thickness prediction model represents the thickness of the superconducting cavity film to be detected. According to the invention, the technical effect of convenient and near-lossless characterization of the thickness of the superconducting cavity film of the accelerator is achieved.

The present invention discloses a cryostat for conduction-cooled superconducting cavity testing and its cooling method. The cryostat of the present invention includes a vacuum container, and a support rod is connected to the top cover of the vacuum container; a magnetic shield is provided inside the vacuum container, and a cold screen is provided inside the magnetic shield; a superconducting cavity support plate is provided inside the cold screen; the magnetic shield, the cold screen and the superconducting cavity support plate are respectively connected and fixed to the support rod; a pulse tube refrigerator is provided on the vacuum container, and its second-stage cold head is connected to the superconducting cavity through a flexible heat conduction material connection unit; a liquid nitrogen input pipe and a liquid nitrogen output pipe are provided on the vacuum container for inputting liquid nitrogen to cool the cold screen. The cooling and rewarming times of the cryostat of the present invention are greatly shortened, greatly improving the test efficiency; at the same time, the volume and cost are also reduced, and it can also be used as a cryogenic experimental platform for other cryogenic measurement experiments.

The invention relates to the technical field of manufacturing of radio frequency superconducting cavities for particle accelerators, in particular to an electron beam welding method for a middle dumbbell component of an ellipsoidal radio frequency superconducting cavity. The beam channel main welding fixing tool comprises a first elastic compensation structure, the reinforcing rib welding fixing tool comprises a second elastic compensation structure, and the two elastic compensation structures can provide correction force opposite to the deformation direction and positively correlated with the deformation amount during welding. The tool with the compensation structure is adopted for achieving the sequential single-face welding process of axial pressing fit of the beam channel area and the reinforcing rib, the number of tools and the welding frequency are reduced, real-time defect compensation in the welding process is achieved through the first elastic compensation structure and the second elastic compensation structure, and irreversible deformation and deviation are reduced.