Design, assembly, and pre-commissioning of cryostat for 3W1 superconducting wiggler magnet
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Design, assembly, and pre-commissioning of cryostat for 3W1 superconducting wiggler magnet Miao-Fu Xu1,2,3 • Xiang-Zhen Zhang1,2,3 • Rui Ye1,2,3 • Fu-San Chen1,2,4 • Xiao-Chen Yang1,2,3 • Tong-Xian Zhao1,2,3 • Shao-Peng Li1,2,3 • Xian-Jing Sun1,2,3 Liang-Rui Sun1,2,3 • Chang-Cheng Ma1,2,3 • Rui Ge1,2,3
•
Received: 14 July 2020 / Revised: 29 August 2020 / Accepted: 3 September 2020 / Published online: 11 November 2020 Ó China Science Publishing & Media Ltd. (Science Press), Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Chinese Nuclear Society and Springer Nature Singapore Pte Ltd. 2020
Abstract One of the most important devices for the High Energy Photon Source Test Facility project, the 2.6 T 32-pole 3W1 superconducting wiggler, was designed by the Institute of High Energy Physics (IHEP); its magnetic gap is 68 mm, and its storage energy is 286 kJ. It will be installed at the storage ring of the Beijing Electron Positron Collider Upgrade Project at the IHEP to replace the old permanent wiggler. The primary purpose of the cryostat is to create a safe and reliable system and realize long-term operation with zero liquid helium consumption. To maintain liquid helium temperature, four identical two-stage cryocoolers are placed symmetrically at the wiggler ends. The cryostat has only one 60 K thermal shield, which is used to reduce the heat load to the liquid helium vessel. The cryostat has several novel features, including a suspension system with little heat leakage that is self-centered during cooling of the cryostat, a special copper liner and high-efficiency condensers, three pairs of binary current leads, and three-level safety design. The cryogenic system
This work was supported by the High Energy Photon Source Test Facility (HEPS-TF) project. & Rui Ge [email protected] 1
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2
Key Laboratory of Particle Acceleration Physics and Technology, Chinese Academy of Sciences, Beijing 100049, China
3
Center for Superconducting RF and Cryogenics, Institute of High Energy Physics, Beijing 100049, China
4
University of Chinese Academy of Sciences, Beijing 100049, China
has been cooled three times, and the residual cooling capacity is approximately 0.41 W at 4.2 K without current. Keywords Cryostat Cryocooler Superconducting wiggler Superconducting insertion device
1 Introduction In low- and medium-energy storage rings for the generation of synchrotron radiation (SR), it is necessary to use high-performance insertion devices to meet the increasing demand for the high X-ray flux and characteristic energies needed to support the life sciences and material science. A strong magnetic field is needed because the maximum beam energy and beam current of existing storage rings cannot be optimized [1]. The superconducting wiggler is a state-of-the-art high-peak-field insertion device and is suitable for extending the spectral range of SR storage rings. The performance of the cryogenic system strongly affects the
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