CN-116625024-B - Cold mass assembly of thermostat

CN116625024BCN 116625024 BCN116625024 BCN 116625024BCN-116625024-B

Abstract

The invention discloses a cold mass assembly of a thermostat, which comprises a thermostat bottom plate, a cold mass supporting unit and a supporting component, wherein the cold mass supporting unit is slidably fixed on the top of the thermostat bottom plate through the supporting component, the cold mass supporting unit is pre-offset mounted compared with the thermostat bottom plate at normal temperature, and the pre-offset of the cold mass supporting unit is the cold contraction of a material in a low temperature state. According to the invention, the cold mass supporting unit is pre-offset installed at normal temperature, so that the whole cryostat returns to the neutral line position when cold contracted at low temperature, thereby ensuring that the neutral line at low temperature is not offset and ensuring collimation at low temperature.

Inventors

ZHANG PENG
WANG YUNHU
HAN YUANZHAO
SUN ZHIHE
ZHANG XUEHUA
DING HUAIKUANG
LU MAOLEI
LI YANAN
WANG PEI
BAI FENG
HU JULI
YE HAIFENG
REN QICHEN
LI JIASHUN

Assignees

中国科学院近代物理研究所
安徽万瑞冷电科技有限公司

Dates

Publication Date: 20260505
Application Date: 20230413

Claims (8)

1. The cold mass assembly of the thermostat is characterized by comprising a cold mass supporting part, a plurality of superconducting cavities and superconducting magnets which are connected in series and are arranged on the cold mass supporting part, wherein the cryostat comprises a thermostat bottom plate and a cold mass supporting unit, the cold mass supporting unit is adjustably arranged at the top of the thermostat bottom plate through a supporting component, two ends of the top of the cold mass supporting unit, which are connected with the superconducting cavities and the superconducting magnets, are respectively provided with a connecting piece matched with the cold mass supporting unit, one end of each superconducting cavity is fixed with one connecting piece, the other end of each superconducting cavity is in sliding fit with the other connecting piece, the superconducting cavities and the superconducting magnets move in cold contraction from the sliding fit ends of the superconducting cavities and the superconducting magnets to the fixed ends of the superconducting cavities at low temperature, and a central line of a connecting pipeline between the superconducting cavities and the superconducting magnets is connected in series, and the cold mass supporting part, the superconducting cavities and the superconducting magnets are arranged in a pre-offset manner compared with the central line of the current at normal temperature; the cold mass supporting part comprises two cold mass brackets which are symmetrically distributed, a connecting piece is fixedly arranged at the top of the cold mass bracket, one end of a superconducting cavity is fixedly connected with the cold mass bracket, the other end of the superconducting cavity is in sliding fit with the cold mass bracket, one end of a superconducting magnet is fixedly connected with the cold mass bracket, the other end of the superconducting magnet is in sliding fit with the cold mass bracket, the adjacent superconducting cavities and the superconducting magnet and the superconducting cavity are communicated with each other through a telescopic bellows, the two ends of the superconducting cavity are respectively fixedly connected with a first connecting plate and a second connecting plate, the connecting piece fixedly connected with the top of the cold mass bracket is matched with the first connecting plate and the second connecting plate, the connecting piece comprises a first connecting table and a second connecting table, the first connecting plate is in sliding connection with the first connecting table through a supporting sliding mechanism, the second connecting plate is connected and fastened with the second connecting table through bolts.
2. A cold mass assembly of a thermostat according to claim 1 wherein the pre-deflection of the cold mass support, superconducting cavity, superconducting magnet is the difference in dimensions at normal temperature and at low temperature, respectively.
3. The cold mass assembly of claim 1, wherein the second connecting plate is a rectangular plate, waist holes are respectively formed in two sides of one end top of the second connecting plate, the guide posts are fixed on the top of the second connecting plate, the waist holes are matched with the guide posts, and the bolts are located at the centers of connecting lines of the two waist holes.
4. The thermostat cold mass assembly of claim 3, wherein the supporting sliding mechanism comprises a lower sliding plate and a lower fixing plate, the first connecting plate is a U-shaped plate, the large end face of the first connecting plate is fixedly connected with the superconducting cavity, the two small end faces of the first connecting plate are both formed with mounting holes matched with the lower sliding plate, the lower sliding plate is fixedly connected in the mounting holes, the lower fixing plate is fixedly embedded in the top of the cold mass bracket, the lower sliding plate is in sliding fit with the lower fixing plate through a plurality of spheres, and the radius of each sphere is larger than the sum of the first connecting plate, the superconducting cavity and the second connecting plate under low-temperature cold shrinkage.
5. The cold mass assembly of claim 4, wherein the two ends of the superconducting magnet are respectively and fixedly connected with a third connecting plate and a fourth connecting plate, a third connecting table and a fourth connecting table which are matched with the third connecting plate and the fourth connecting plate are fixedly connected to the top of the cold mass support, and the third connecting plate is in sliding connection with the third connecting table through a supporting sliding mechanism.
6. The thermostat cold mass assembly of claim 1 further comprising a low temperature line, the cold mass support unit further comprising a low temperature line mounting bracket fixedly disposed on top of the cold mass bracket and providing mounting support for the low temperature line.
7. The thermostat cold mass assembly of claim 6, wherein the low-temperature pipeline comprises a main pipe and branch pipes, the main pipe comprises a vertical section and a horizontal section, a telescopic bellows is arranged on the vertical section of the main pipe, a plurality of branch pipes are connected to the bottom of the horizontal section of the main pipe, connecting pipes are respectively arranged at the tops of the superconducting cavity and the superconducting magnet, and the branch pipes are respectively connected with the connecting pipes in a corresponding mode through the telescopic bellows.
8. A thermostat cold mass assembly as claimed in claim 7 wherein the bellows connecting the branch and connecting tube are mounted horizontally.

Description

Cold mass assembly of thermostat Technical Field The invention relates to the technical field of low-temperature superconducting accelerators, in particular to a thermostat cold mass assembly. Background The cryostat is used as the most important component equipment of the superconducting particle accelerator device, and is used for providing liquid helium and mechanical support for a superconducting cavity, a superconducting magnet and the like, realizing and maintaining the temperature and pressure environment required by the normal operation of a superconducting element, forming a heat shield and a heat partition to reduce the overall heat load of the system, and the performance of the cryostat directly determines the investment and the running cost of the whole low-temperature system of the accelerator. The cold mass of the thermostat is formed by connecting a plurality of superconducting cavities and superconducting magnets in series, the relative positions of the superconducting cavities and the superconducting magnets are required to be kept fixed in order to ensure particle acceleration performance, the cold mass can be collimated at normal temperature, but cold shrinkage phenomenon exists in materials at low temperature, and the cold shrinkage amounts of different materials are different. The problem of low temperature collimation of the superconducting cavity and superconducting magnet within the cold mass is critical to the performance of the thermostat. The patent document with the prior patent publication number of CN 205175896U discloses an adjustable coupling connector of a spectrometer and a cryostat, which comprises a bracket, wherein the bracket comprises an upper support plate, a lower support plate and a support column, a containing cavity for placing a spectrometer sample cup is formed between the upper support plate and the lower support plate, the lower support plate is provided with a base, the upper end surface of the base is provided with a groove with an upward opening for placing the spectrometer sample cup, the upper support plate is provided with a jack and a reserved observation hole penetrating through the end surfaces of the two ends, the periphery of the jack is provided with a direction fine-tuning device, the direction fine-tuning device is used for clamping and adjusting the position of a cold head in the containing cavity, the side surface of the bracket is provided with a back baffle, the top of the back baffle is connected with the upper support plate, the bottom of the back baffle is connected with the lower support plate, the joint of the bottom of the back baffle and the lower support plate is provided with an angle link, and the edge of the jack is provided with a flexible material layer. However, the materials of the superconducting cavity and the superconducting magnet have cold shrinkage phenomenon at low temperature, and the cold shrinkage amounts of different materials are different, so that collimation at low temperature cannot be ensured. Disclosure of Invention The technical problem to be solved by the invention is how to ensure the collimation of the superconducting cavity of the cold mass support and the superconducting magnet at low temperature. The invention solves the technical problems by adopting the technical means that the thermostat cold mass assembly comprises a cold mass supporting part, a plurality of superconducting cavities and superconducting magnets which are arranged on the cold mass supporting part and connected in series, wherein connecting pieces matched with the superconducting cavities and the superconducting magnets are arranged at two ends of the top of the cold mass supporting unit, which are connected with the superconducting cavities and the superconducting magnets, one end of each superconducting cavity is fixed with one connecting piece, the other end of each superconducting cavity is in sliding fit with the other connecting piece, the superconducting cavities and the superconducting magnets move from the sliding fit ends to the fixed ends at low temperature in a shrinkage way, the central line of the connecting pipeline between the superconducting cavities and the superconducting magnets is connected with the beam center, and the cold mass supporting part, the superconducting cavities and the superconducting magnets are arranged in a pre-offset way at normal temperature compared with the beam center. The cold mass supporting part, the superconducting cavity and the superconducting magnet are pre-offset installed at normal temperature, so that the whole cold mass assembly can shrink at low temperature, the superconducting cavity and the superconducting magnet move from the sliding fit end to the fixed end at low temperature, and collimation at low temperature is guaranteed. As a preferable technical scheme, the pre-offset amounts of the cold mass supporting part, the superconducting cavity and the superconducting magnet are re