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Purpose <p>The upgrade project of the Beijing Electron Positron Collider (BEPCII) requires raising the magnetic field gradient of the superconducting quadrupole magnets located on both sides of the collision point from 18 T/m to 25 T/m, which necessitates the development of two new compact cryostats. Since these cryostats need to be inserted into the detector, the available space is limited. Its structural design faces challenges such as high heat insulation requirements, strict control over component deformation, and enhanced heat exchange efficiency requirements for narrow flow channels.</p> Methods <p>We have designed a compact structural configuration for the compact SCQ-B cryostat. For this structure, we adopted the finite element method (FEM) to optimize the structure of key components including K-type supports and thermal shields. Furthermore, we verified the effectiveness of helium bath cooling via CFD simulations and compared two distinct cooling modes. In addition, a horizontal test platform was established to validate the thermal performance of the SCQ-B cryostat.</p> Results <p>Following fabrication, the SCQ-B cryostat was integrated with the BEPCII SCQ horizontal test station for offline performance testing. The static heat load of the cryostat was 29.3 W, and the SCQ-B magnet was successfully energized to its design current, with the generated magnetic field fully meeting design specifications.</p> Conclusions <p>By developing the SCQ-B cryostat, we have gained substantial design expertise relevant to compact cryostats for superconducting magnet applications. Furthermore, the cryostat is scheduled for installation in the BEPCII tunnel, where it will underpin high-energy physics research efforts.</p>

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Optimized design and horizontal testing of the SCQ-B cryostat for BEPCII upgrade

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Penghui Li,
  • Miaofu Xu,
  • Ruixiong Han,
  • Minjing Sang,
  • Rui Ye,
  • Jiehao Zhang,
  • Rui Ge,
  • Shaopeng Li,
  • Wan Chen

摘要

Purpose

The upgrade project of the Beijing Electron Positron Collider (BEPCII) requires raising the magnetic field gradient of the superconducting quadrupole magnets located on both sides of the collision point from 18 T/m to 25 T/m, which necessitates the development of two new compact cryostats. Since these cryostats need to be inserted into the detector, the available space is limited. Its structural design faces challenges such as high heat insulation requirements, strict control over component deformation, and enhanced heat exchange efficiency requirements for narrow flow channels.

Methods

We have designed a compact structural configuration for the compact SCQ-B cryostat. For this structure, we adopted the finite element method (FEM) to optimize the structure of key components including K-type supports and thermal shields. Furthermore, we verified the effectiveness of helium bath cooling via CFD simulations and compared two distinct cooling modes. In addition, a horizontal test platform was established to validate the thermal performance of the SCQ-B cryostat.

Results

Following fabrication, the SCQ-B cryostat was integrated with the BEPCII SCQ horizontal test station for offline performance testing. The static heat load of the cryostat was 29.3 W, and the SCQ-B magnet was successfully energized to its design current, with the generated magnetic field fully meeting design specifications.

Conclusions

By developing the SCQ-B cryostat, we have gained substantial design expertise relevant to compact cryostats for superconducting magnet applications. Furthermore, the cryostat is scheduled for installation in the BEPCII tunnel, where it will underpin high-energy physics research efforts.