SSRF波荡器EPU148动力学积分场效应磁场垫补

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。...

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Bibliographic Details
Published in核技术 Vol. 39; no. 7; pp. 15 - 20
Main Author 张淼 周巧根
Format Journal Article
LanguageChinese
Published 中国科学院大学 北京100049%中国科学院上海应用物理研究所嘉定园区 上海201800 2016
中国科学院上海应用物理研究所嘉定园区 上海201800
Subjects
动力学积分场
波荡器
磁场垫补
动力学积分场
Undulator
波荡器
Dynamic field integral
磁场垫补
Field shimming
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ISSN0253-3219
DOI10.11889/j.0253-3219.2016.hjs.39.070103

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Summary: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。
Bibliography: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 m
ISSN:0253-3219
DOI:10.11889/j.0253-3219.2016.hjs.39.070103