Self-adaptive centering structure for superconducting acceleration unit

Abstract

The invention relates to the technical field of low-temperature superconducting and radio-frequency superconducting, in particular to a self-adaptive centering structure for a superconducting acceleration unit. The self-adaptive centering structure comprises a cold mass support which is arranged to be of a frame structure matched with the shape of the superconducting acceleration unit and is used for supporting the superconducting acceleration unit in a low-temperature environment; the three-point centering support assembly is arranged between the cold mass bracket and the solenoid and is used for preventing the magnetic center of the solenoid from deviating along with the temperature change; and the four-point pre-offset supporting assembly is arranged between the cold mass bracket and the superconducting cavity and is used for preventing the electric center of the superconducting cavity from being offset along with the temperature change. According to the invention, the three-point centering support assembly and the four-point pre-offset support assembly are arranged between the superconducting acceleration unit and the cold mass bracket, so that the deformation difference caused by cooling of the superconducting cavity, the solenoid and the cold mass bracket can be compensated, and the collimation precision of the solenoid and the superconducting cavity in a normal temperature state can be maintained in the cooling process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-temperature superconductivity and radio frequency superconductivity, in particular to a self-adaptive centering structure for a superconducting accelerating unit. BACKGROUND

[0002] The superconducting accelerating unit is the most important component of the superconducting linear accelerator, which can provide the 2K / 4K ultra-low temperature environment and adiabatic vacuum required for the cold mass string composed of superconducting cavities and solenoids, and make the superconducting linear accelerator have beam collimation characteristics. Generally, the cold mass string contains multiple superconducting cavities and solenoids, and is placed in a normal-temperature vacuum chamber through a support structure. In order to improve the beam quality of the accelerator, the beam channels between the superconducting cavities, between the superconducting cavities and the solenoids, and between the solenoids must have high collimation accuracy.

[0003] However, the collimation and calibration of the cold mass string are usually carried out at room temperature. During the operation of the accelerator, the temperature must be reduced to the 2K / 4K liquid helium temperature range, so that the superconducting cavities, solenoids and support structures will have different amounts of cold shrinkage deformation and position offset. Moreover, the offset is uncertain, which leads to a decrease in the beam focusing efficiency of the solenoids and the beam acceleration efficiency of the superconducting cavities, and the superconducting accelerating unit cannot meet the collimation accuracy requirements of the beam channel. SUMMARY

[0004] The present application aims to solve the technical problems in the related art. To this end, the present application provides a self-adaptive centering structure for a superconducting accelerating unit to realize the preset route offset of the superconducting accelerating unit during the cooling process, and improve the collimation accuracy of the beam channel in the superconducting accelerating unit.

[0005] The present application provides a self-adaptive centering structure for a superconducting accelerating unit, the superconducting accelerating unit comprising a solenoid and a superconducting cavity, and the self-adaptive centering structure comprising: a cold mass support configured as a frame structure matching the shape of the superconducting accelerating unit, for supporting the superconducting accelerating unit in a low-temperature environment; a three-point centering support assembly arranged between the cold mass support and the solenoid, for avoiding the magnetic center of the solenoid from shifting with temperature changes; a four-point pre-offset support assembly arranged between the cold mass support and the superconducting cavity, for avoiding the electric center of the superconducting cavity from shifting with temperature changes.

[0006] According to the self-adaptive centering structure for a superconducting accelerating unit provided by the present application, the three-point centering support assembly comprises: a first support provided with a vertical guide groove; a second support provided with two inclined guide grooves; The first ear plate is provided with a fulcrum protruding from the plate surface; The second ear plate is provided with two supporting points protruding from the plate surface; The first support and the second support are mounted on the top surface of the cold mass support, the first ear plate is mounted on one side of the solenoid, and the second ear plate is mounted on the other side of the solenoid symmetrical to the first ear plate; The first ear plate is in sliding contact with the first support, and the second ear plate is in sliding contact with the second support.

[0007] According to an adaptive centering structure for a superconducting acceleration unit provided by the present invention, the vertical guide groove centerline of the first support and the oblique guide groove centerline of the second support intersect at one point and are located on the mechanical center of the solenoid and the beam centerline.

[0008] According to an adaptive centering structure for a superconducting acceleration unit provided by the present invention, the four-point pre-offset support assembly includes: The third support is provided with an oblique guide groove; The fourth support is provided with a raised platform surface; The third ear plate is provided with a fulcrum protruding from the plate surface; Among them, the three third supports and one fourth support are installed in a rectangular layout on the top surface of the cold mass support, the four third ear plates are symmetrically installed on both sides of the superconducting cavity, and the third ear plates are in sliding contact with the third supports.

[0009] According to an adaptive centering structure for a superconducting acceleration unit provided by the present invention, the center lines of the oblique guide grooves of the three third supports intersect at one point and are located on the mechanical center of the superconducting cavity and the beam center line.

[0010] According to an adaptive centering structure for a superconducting acceleration unit provided by the present invention, the solenoid and the superconducting cavity are connected in series via a beam bellows for error compensation.

[0011] According to an adaptive centering structure for a superconducting acceleration unit provided by the present invention, the cold mass support comprises: A side plate, wherein a top of the side plate is provided with a first recess adapted to fit the superconducting cavity; An end plate, vertically arranged at one end of the side plate; The two side uprights and the two end uprights are arranged along the rectangular edge and connected end to end to form a rectangular frame, and a top plate extending outward from the rectangular frame is provided on the top of the side uprights; The three third supports and the one fourth support are distributed on both sides of the first recess and are installed on the top plate.

[0012] According to an adaptive centering structure for a superconducting acceleration unit provided by the present invention, the cold mass support further comprises a partition disposed inside the rectangular frame, the partition being parallel to the end plate and connected to the side plate; A second recess adapted for the solenoid is provided on the top of the partition, and the first support and the second support are distributed on both sides of the second recess.

[0013] According to the adaptive centering structure for a superconducting acceleration unit provided by the present invention, the cold mass support further includes a bottom plate, and the side upright plates and the end upright plates are vertically arranged on the bottom plate.

[0014] According to an adaptive centering structure for a superconducting acceleration unit provided by the present invention, the supporting points on the first ear plate, the second ear plate and the third ear plate are configured as hemispherical protrusions.

[0015] The above one or more technical solutions in the present invention have at least one of the following technical effects: By setting a three-point centering support assembly and a four-point pre-offset support assembly between the superconducting acceleration unit and the cold mass support, the deformation difference caused by cooling of the superconducting cavity, solenoid and cold mass support can be compensated, so that the solenoid and the superconducting cavity can maintain the alignment accuracy at room temperature during the cooling process, solving the problem of the magnetic center of the solenoid and the electric center of the superconducting cavity offset with temperature changes, and improving the beam focusing efficiency of the solenoid and the beam acceleration efficiency of the superconducting cavity.

[0016] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted, and the advantages brought about by the technical features of these technical solutions described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings, or can be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only 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.

[0018] Figure 1 This is an overall three-dimensional structural diagram of the adaptive centering structure provided by an embodiment of the present invention.

[0019] Figure 2 A three-dimensional structural diagram of the cold mass support provided in an embodiment of the present invention.

[0020] Figure 3 A three-dimensional structural diagram of a superconducting acceleration unit provided in an embodiment of the present invention.

[0021] Figure 4 A bottom view of a superconducting acceleration unit provided in an embodiment of the present invention.

[0022] Figure 5 A top view of a cold mass support provided in an embodiment of the present invention.

[0023] Reference numerals: 100. Superconducting acceleration unit; 110. Solenoid; 120. Superconducting cavity; 130. Beam bellows; 200. Adaptive centring structure; 210. Cold mass support; 211. Side plate; 2111. First recess; 212. End plate; 213. Partition; 2131. Second recess; 214. Top plate; 215. Bottom plate; 220. Three-point centring support assembly; 221. First support; 222. Second support; 223. First ear plate; 224. Second ear plate; 230. Four-point pre-offset support assembly; 231. Third support; 232. Fourth support; 233. Third ear plate. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] In an embodiment of the present invention, an adaptive centering structure 200 for a superconducting acceleration unit 100 is introduced.

[0026] See also Figure 1 、 Figure 3 and Figure 4 As shown, the superconducting acceleration unit 100 includes a solenoid 110, a superconducting cavity 120 and a beam bellows 130 disposed therebetween. The superconducting cavity 120 and the solenoid 110 form a cold mass string and are placed in a room temperature vacuum chamber via a supporting structure.

[0027] The solenoid 110 and the beam flange of the superconducting cavity 120 are connected in series according to a certain rule, and the beam bellows 130 are used to compensate for errors between the two, thereby forming a vacuum-sealed beam channel.

[0028] The beam channel flanges of the solenoid 110 and the superconducting cavity 120 remain concentric at both room temperature and low temperature, and do not deviate due to shrinkage deformation.

[0029] In particular, an adaptive centering structure 200 is provided between the superconducting acceleration unit 100 and the supporting structure to solve the problem of the magnetic center of the solenoid 110 and the electric center of the superconducting cavity 120 shifting with temperature changes.

[0030] The adaptive centring structure 200 mainly includes a cold mass support 210 , a three-point centring support assembly 220 and a four-point pre-offset support assembly 230 .

[0031] The cold mass support 210 is configured as a frame structure that matches the shape of the superconducting acceleration unit 100 and is used to support the superconducting acceleration unit 100 in a low-temperature environment.

[0032] A three-point centring support assembly 220 is provided between the cold mass support 210 and the solenoid 110 to prevent the magnetic center of the solenoid 110 from shifting due to temperature changes; The four-point pre-shift support assembly 230 is disposed between the cold mass support 210 and the superconducting cavity 120 to prevent the electric center of the superconducting cavity 120 from shifting due to temperature changes.

[0033] Furthermore, the three-point centering support assembly 220 includes a first support 221 , a second support 222 , a first ear plate 223 and a second ear plate 224 .

[0034] The first support 221 is provided with a vertical guide groove. The second support 222 is provided with two oblique guide grooves. The first ear plate 223 is provided with a fulcrum protruding from the plate surface. The second ear plate 224 is provided with two fulcrums protruding from the plate surface.

[0035] See also Figure 2 and Figure 3 As shown, the first support 221 and the second support 222 are mounted on the top surface of the cold mass support 210. The first lug plate 223 is mounted on one side of the solenoid 110. The second lug plate 224 is mounted on the other side of the solenoid 110, symmetrical to the first lug plate 223. The first lug plate 223 and the second lug plate 224 extend radially outward from the outer circumference of the solenoid 110.

[0036] The first lug 223 cooperates with the first support 221 to achieve sliding contact by inserting the fulcrum into the vertical guide groove. The second lug 224 cooperates with the second support 222 to achieve sliding contact by inserting the fulcrum into the oblique guide groove.

[0037] Furthermore, the four-point pre-deflection support assembly 230 includes a third support 231 , a fourth support 232 and a third ear plate 233 .

[0038] The third support 231 is provided with an inclined guide groove, the fourth support 232 is provided with a convex surface, and the third ear plate 233 is provided with a fulcrum protruding from the plate surface.

[0039] Referring to Figure 2 As shown, three third supports 231 and one fourth support 232 are installed in a rectangular layout on the top surface of the cold mass support 210. Four third ear plates 233 are symmetrically installed on both sides of the superconducting cavity 120. The third ear plates 233 are matched with the third supports 231 to achieve sliding abutment by embedding the fulcrum into the oblique guide slot.

[0040] Further, the fulcrums on the first ear plate 223, the second ear plate 224 and the third ear plate 233 are provided as semispherical protrusions.

[0041] In this embodiment, by setting the three-point centering support assembly 220 and the four-point pre-offset support assembly 230 between the superconducting accelerating unit 100 and the cold mass support 210, the deformation amount difference of the superconducting cavity 120, the solenoid 110 and the cold mass support 210 caused by cooling can be compensated, and the solenoid 110 and the superconducting cavity 120 can maintain the collimation accuracy at room temperature during the cooling process, thereby solving the problem that the magnetic center of the solenoid 110 and the electric center of the superconducting cavity 120 are offset with temperature changes, and improving the beam focusing efficiency of the solenoid 110 and the beam accelerating efficiency of the superconducting cavity 120.

[0042] On the basis of the above-mentioned embodiment, another embodiment of the present application introduces a self-adaptive centering structure 200 for the superconducting accelerating unit 100.

[0043] Referring to Figure 5 As shown, the vertical guide slot center line of the first support 221 and the oblique guide slot center line of the second support 222 intersect at a point.

[0044] Further, the intersection point of the vertical guide slot center line and the oblique guide slot center line of the second support 222 is located on the mechanical center of the solenoid 110 and the beam center line, so that the solenoid 110 can always maintain the same magnetic center as the theoretical position at room temperature and the theoretical position at low temperature during the process of reducing from 300K room temperature to 4K / 2K low temperature, thereby improving the beam focusing efficiency of the solenoid 110.

[0045] In addition, the oblique guide slot center lines of the three third supports 231 intersect at a point. The intersection point of the oblique guide slot center lines of the three third supports 231 is located on the mechanical center of the superconducting cavity 120 and the beam center line.

[0046] Therefore, the superconducting cavity 120 can always maintain the same electric center as the theoretical position at room temperature and the theoretical position at low temperature during the process of reducing from 300K room temperature to 4K / 2K low temperature, thereby improving the beam accelerating efficiency of the superconducting cavity 120.

[0047] On the basis of the above-mentioned embodiment, in another embodiment of the present application, an adaptive centering structure 200 for the superconducting accelerating unit 100 is introduced.

[0048] Please refer to Figure 2 As shown in the figure, the cold mass support 210 mainly comprises side upright plates 211, end upright plates 212 and a top plate 214.

[0049] The top of the side upright plate 211 is provided with a first notch 2111 adapted to the superconducting cavity 120. The end upright plate 212 is vertically arranged at one end of the side upright plate 211.

[0050] The two side upright plates 211 and the two end upright plates 212 are arranged along the rectangular boundary line. Moreover, the side upright plates 211 and the end upright plates 212 are alternately connected head to tail to form a rectangular frame.

[0051] The top of the side upright plate 211 is provided with the top plate 214 extending to the outside of the rectangular frame.

[0052] The three third supports 231 and the fourth support 232 are distributed on both sides of the first notch 2111 and are mounted on the top plate 214.

[0053] Further, the cold mass support 210 further comprises a partition plate 213 arranged inside the rectangular frame. The partition plate 213 is parallel to the end upright plate 212. Moreover, the partition plate 213 is connected with the side upright plate 211.

[0054] The top of the partition plate 213 is provided with a second notch 2131 adapted to the solenoid 110. The first support 221 and the second support 222 are distributed on both sides of the second notch 2131.

[0055] Further, the cold mass support 210 further comprises a bottom plate 215. The side upright plate 211 and the end upright plate 212 are vertically arranged on the bottom plate 215.

[0056] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0057] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0058] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms are not limited to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0060] 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 various embodiments of the present invention.

Claims

1. An adaptive centering structure for a superconducting acceleration unit, wherein the superconducting acceleration unit (100) comprises a solenoid (110) and a superconducting cavity (120), characterized in that: The adaptive centring structure (200) includes: A cold mass support (210) is provided as a frame structure adapted to the shape of the superconducting acceleration unit (100), and is used for supporting the superconducting acceleration unit (100) in a low-temperature environment; a three-point centring support assembly (220), arranged between the cold mass support (210) and the solenoid (110), and used to prevent the magnetic center of the solenoid (110) from shifting due to temperature changes; A four-point pre-offset support assembly (230) is provided between the cold mass support (210) and the superconducting cavity (120) and is used to prevent the electric center of the superconducting cavity (120) from being offset due to temperature changes.

2. The adaptive centering structure for a superconducting acceleration unit according to claim 1, characterized in that: The three-point centring support assembly (220) comprises: The first support (221) is provided with a vertical guide groove; The second support (222) is provided with two oblique guide grooves; The first ear plate (223) is provided with a fulcrum protruding from the plate surface; The second ear plate (224) is provided with two supporting points protruding from the plate surface; The first support (221) and the second support (222) are mounted on the top surface of the cold mass support (210), the first ear plate (223) is mounted on one side of the solenoid (110), and the second ear plate (224) is mounted on the other side of the solenoid (110) symmetrical to the first ear plate (223); The first ear plate (223) is in sliding contact with the first support (221), and the second ear plate (224) is in sliding contact with the second support (222).

3. The adaptive centering structure for a superconducting acceleration unit according to claim 2, characterized in that: The vertical guide groove centerline of the first support (221) and the oblique guide groove centerline of the second support (222) intersect at one point and are located on the mechanical center and beam centerline of the solenoid (110).

4. The adaptive centering structure for a superconducting acceleration unit according to claim 2 or 3, characterized in that: The four-point pre-deflection support assembly (230) comprises: The third support (231) is provided with an oblique guide groove; The fourth support (232) is provided with a raised platform surface; The third ear plate (233) is provided with a fulcrum protruding from the plate surface; The three third supports (231) and the one fourth support (232) are arranged in a rectangular shape and are mounted on the top surface of the cold mass support (210); the four third ear plates (233) are symmetrically mounted on both sides of the superconducting cavity (120); and the third ear plates (233) are in sliding contact with the third support (231).

5. The adaptive centering structure for a superconducting acceleration unit according to claim 4, characterized in that: The center lines of the inclined guide grooves of the three third supports (231) intersect at one point and are located at the mechanical center and beam center line of the superconducting cavity (120).

6. The adaptive centering structure for a superconducting acceleration unit according to claim 5, characterized in that: The solenoid (110) and the superconducting cavity (120) are connected in series via a beam bellows (130) for error compensation.

7. The adaptive centering structure for a superconducting acceleration unit according to claim 6, characterized in that: The cold mass support (210) comprises: A side plate (211), wherein a top of the side plate (211) is provided with a first notch (2111) adapted to fit the superconducting cavity (120); An end stand (212) is vertically arranged at one end of the side stand (211); The two side upright plates (211) and the two end upright plates (212) are arranged along the rectangular edge and connected end to end to form a rectangular frame, and a top plate (214) extending toward the outside of the rectangular frame is provided on the top of the side upright plates (211); The three third supports (231) and the one fourth support (232) are distributed on both sides of the first recess (2111) and are mounted on the top plate (214).

8. The adaptive centering structure for a superconducting acceleration unit according to claim 7, characterized in that: The cold mass support (210) further includes a partition (213) arranged inside the rectangular frame, wherein the partition (213) is parallel to the end upright plate (212) and connected to the side upright plate (211); A second recess (2131) adapted for the solenoid (110) is provided on the top of the partition (213), and the first support (221) and the second support (222) are distributed on both sides of the second recess (2131).

9. The adaptive centering structure for a superconducting acceleration unit according to claim 8, characterized in that: The cold mass support (210) further includes a bottom plate (215), and the side upright plates (211) and the end upright plates (212) are vertically arranged on the bottom plate (215).

10. The adaptive centering structure for a superconducting acceleration unit according to claim 9, characterized in that: The supporting points on the first ear plate (223), the second ear plate (224) and the third ear plate (233) are configured as hemispherical protrusions.

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