Development of sub-cooled liquid nitrogen cooling system for CPMU

Lijun LIU; Shuhua WANG; Jian WANG; Ming LI; Yiyong LIU; Li WANG

doi:10.11889/j.0253-3219.2017.hjs.40.070101

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Development of sub-cooled liquid nitrogen cooling system for CPMU

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | 更新时间：2021-05-19

- Development of sub-cooled liquid nitrogen cooling system for CPMU
- NUCLEAR TECHNIQUES Vol. 40, Issue 7, Article number: 070101(2017)
- 作者机构：
  
  1.中国科学院上海应用物理研究所张江园区上海 201204
  2.中国科学院大学北京 100049
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2017.hjs.40.070101
  CLC： TL503.91
- Received：22 March 2017，
  
  Revised：19 April 2017，
  
  Published：10 July 2017
- 稿件说明：
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Lijun LIU, Shuhua WANG, Jian WANG, et al. Development of sub-cooled liquid nitrogen cooling system for CPMU[J]. Nuclear techniques, 2017, 40(7): 070101
DOI：

Lijun LIU, Shuhua WANG, Jian WANG, et al. Development of sub-cooled liquid nitrogen cooling system for CPMU[J]. Nuclear techniques, 2017, 40(7): 070101 DOI： 10.11889/j.0253-3219.2017.hjs.40.070101.

摘要

低温永磁波荡器（Cryogenic Permanent Magnet Undulator

CPMU）是目前插入件技术发展的主要方向之一，其利用一些永磁材料，如钕铁硼（NdFeB）或镨铁棚（PrFeB）的磁场性能在低温下明显高于室温的特性来提高波荡器性能和光源束流品质，工作温区为50-150 K，需要冷却系统的冷却。CPMU冷却系统主要包括过冷液氮冷却系统和磁体阵列冷却回路。本文介绍了上海光源（Shanghai Synchrotron Radiation Facility

SSRF）CPMU过冷液氮冷却系统的设计方案和设计参数，进行了系统主要热负载的分析；对冷却系统中关键设备之一的过冷换热器进行了设计，并计算分析了过冷氮流经CPMU冷却系统的全程阻力损失，为系统另一关键设备液氮泵的选型提供依据。对CPMU过冷液氮冷却系统进行的在线测试表明，该设计满足CPMU样机的冷却需求。

Abstract

Background

The cryogenic permanent magnet undulator (CPMU) is one of the development trends of the insertion technology. The CPMU

made of NdFeB or PrFeB materials

has a better magnetic field performance at low temperature than that at room temperature. The operating temperature of the CPMU is in the range of 50-150 K up to the magnetic material to be adopted. The CPMU cooling system mainly consists of the CPMU sub-cooled liquid nitrogen cooling system and the CPMU magnet array cooling loop.

Purpose

This study aims to develop the CPMU sub-cooled liquid nitrogen (SLN

) cooling system.

Methods

According to the design scheme and design parameters of the first CPMU SLN

cooling system for the Shanghai synchrotron radiation facility (SSRF)

the heat loads of the system were calculated. The sub-cooled heat exchanger

one of the key components of the SLN

system was designed. The flow resistance of the sub-cooled liquid nitrogen going through the whole CPMU cooling system was calculated

which provides the design base for liquid nitrogen recirculation pump.

Results & Conclusion

The first CPMU

made of NdFeB material

and its SLN

cooling system were installed at SSRF since August

2016. Online test results showed that the SLN

system met the CPMU cooling requirements and run stably.

关键词

Keywords

references

Kitamura H, Hara T, Maréchal X, et al. Design criteria and technology challenges for the undulators of the future[C]. Proceedings of 9th European Particle Accelerator Conference, EPAC2004, Lucerne, Switzerland, 2004: 59-63.

Hara T, Tanaka T, Kitamura H. Insertion devices of next generation[C]. Proceedings of 3rd Asian Particle Accelerator Conference, APAC2004, Gyeongju, Korea, 2004: 216-220.

Kitegi C. Development of a cryogenic permanent magnet undulator at the ESRF[D]. Grenoble, France: Université Joseph Fourier, 2008.

Benabderrahmane C, Berteaud P, Tavakoli K, et al. Development of cryogenic undulator CPMU at SOLEIL[C]. Proceedings of 11th European Particle Accelerator Conference, EPAC2008, Genoa, Italy, 2008: 2225-2227.

Zhang Y C, Li S P, Lu H H, et al. Preliminary design of cooling system for a PrFeB-based cryogenic permanent magnet undulator prototype at IHEP[C]. Proceedings of 5th International Particle Accelerator Conference, IPAC2014, Dresden, Germany, 2014: 2743-2745.

Guobang CHEN , Tao JIN , Ke TANG . Low temperature heat and equipment , : Beijing National Defence Industry Press , 2008 . 36 - 45 .

Barron R F. Cryogenic heat transfer[M]. Philadelphia: Taylor & ; Francis, 1999: 100-101, 165.

齐鄂荣 , 曾玉红 . 工程流体力学 , : 武汉武汉大学出版社 , 2005 . 126 - 129 .

Erong QI , Yuhong ZENG . Engineering fluid mechanics , : Wuhan Wuhan University Press , 2005 . 126 - 129 .

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