Field shimming for effect of EPU148 dynamic field integral at SSRF

Miao ZHANG; Qiaogen ZHOU

doi:10.11889/j.0253-3219.2016.hjs.39.070103

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Field shimming for effect of EPU148 dynamic field integral at SSRF

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | 更新时间：2021-05-24

- Field shimming for effect of EPU148 dynamic field integral at SSRF
- NUCLEAR TECHNIQUES Vol. 39, Issue 7, Article number: 070103(2016)
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800;
  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.0253-3219.2016.hjs.39.070103
  CLC： TL594
- Received：04 May 2016，
  
  Revised：19 May 2016，
  
  Published：2016-07
- 稿件说明：
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Miao ZHANG, Qiaogen ZHOU. Field shimming for effect of EPU148 dynamic field integral at SSRF[J]. Nuclear techniques, 2016, 39(7): 070103
DOI：

Miao ZHANG, Qiaogen ZHOU. Field shimming for effect of EPU148 dynamic field integral at SSRF[J]. Nuclear techniques, 2016, 39(7): 070103 DOI： 10.11889/j.0253-3219.2016.hjs.39.070103.

摘要

阐述了减少“APPLE （Advanced Planar Polarized Light Emitter）-Ⅱ”型可变椭圆极化波荡器动力学积分场效应的“L-Shimming”垫补方法的原理。优化设计了上海光源“梦之线”光束线站波荡器EPU148磁场垫补方案，磁场实际测量结果和模拟计算结果基本一致，误差小于最大垫补量的10%，垫补后动力学积分场效应对束流的影响减少一个数量级。机器研究结果显示，波荡器EPU148所有工作磁气隙和所有工作相位下引起的工作点漂移小于0.001，对束流注入效率基本没有影响，证明了其动力学积分场效应垫补是成功的。

Abstract

Background

The dynamic field integral means the integrated magnetic field along the electron's trajectory in undulator

which will cause the tune shift

dynamic aperture reduction and beam lifetime shortening

etc.

The effect is inversely proportional to the square of the electron energy and the filed transverse roll-off. The field of the APPLE-Ⅱ type Elliptical Polarization Undulator (EPU) has a very fast

intrinsic

transverse roll-off

especially for the vertical polarization mode

creating significant dynamic field integral effect to the beam motion. The research on the dynamic field integral effect of APPLE-Ⅱ type EPU and the corresponding magnetic field shimming method is the hotspot in the field of international particle accelerator.

Purpose

The principle of "L-Shimming" method to reduce dynamic field integral effect for APPLE-Ⅱ type EPU is stated in this paper. Methods: The optimization design of "L-Shimming" for EPU148 dynamic field integral effect has been done with "RADIA Code".

Results

The measurement results of flipping coil indicate that the magnetic field strength measured is coincident with the simulation result

and the error is less than 10% of the maximum shimming quantity. After shimming

the dynamic field integral effect of EPU148 will reduce an order of magnitude. The machine study has been done after EPU148 is installed in SSRF storage ring with the tune shift less than 0.001

and the beam injection efficiency has almost not been influenced with EPU148 in all operation polarization modes and all operation gaps.

Conclusion

It is proved that the shimming to reduce EPU148 dynamic field integral effect is successful.

关键词

Keywords

references

Elleaume P. A new approach to the electron beam dynamics in undulators and wigglers[C]. Proceedings of European Particle Accelerator Conference, 1992:661-663

M Zhang , Q G Zhou . Study of the beam tune-shift effects for DEPU at SSRF . IEEE Transactions on Applied Superconductivity , 2012 . 22 ( 3 ): 4002203 .

Hwang C S, Lin P H, Huang M H, et al. Magnet block arrangements for the APPLE-Ⅱ elliptically polarized undulator[C]. Proceedings of European Particle Accelerator Conference, 2007:1079-1081

Wang T, Jia Q K. Study of magnetic block arrangement of APPLE-Ⅱ undulator[C]. Proceedings of European Particle Accelerator Conference, 2008:2362-2364

Chavanne J, van Vaerenbergh P, Elleaume P, et al. Recent achievements and future prospect of ID activities at the ESRF[C]. Proceedings of European Particle Accelerator Conference, 2000:2346-2348

Elleaume P, Chubar O, Chavanne J. Computing 3D magnetic fields from insertion devices[C]. Proceedings of Particle Accelerator Conference, 1997:3509-3511

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Related Institution

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science & Technology

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Shanghai Institute of Applied Physics, the Chinese Academy of Sciences

中国科学院上海应用物理研究所

National Synchrotron Radiation Laboratory, University of Science and Technology of China

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