標題: Investigating excitation-dependent and fringe-field effects of electromagnet and permanent-magnet phase shifters for a crossed undulator
作者: Chung, Ting-Yi
Yang, Chih-Sheng
Chu, Yun-Liang
Lin, Fu-Yuan
Jan, Jyh-Chyuan
Hwang, Ching-Shiang
電子物理學系
Department of Electrophysics
關鍵字: Phase shifter;Hysteresis;Crosstalk;Phase matching;Fringe field
公開日期: 1-Apr-2017
摘要: To enhance the flux density or to control polarization, a phase shifter was designed and used to modulate the phase matching between segmented undulators. A larger hysteresis loop causes, however, a repeatability issue in the phase matching; the fringe field of the phase shifter creates an extra magnetic-field error. The design of the phase shifter must therefore minimize the hysteresis loop and fringe field to maintain the phases exact and to ignore the crosstalk effect. Two critical issues are the hysteresis-loop problem and the fringe-field effect, which determine the radiation performance and the stability of the ring. To investigate these issues, a phase shifter was constructed to operate in accordance with electromagnetic- and permanent-type magnets; the results from the field measurements and shims are discussed here. The shimming algorithm and a compact permanent-magnet phase shifter that eliminates the issues are also presented.
URI: http://dx.doi.org/10.1016/j.nima.2017.01.011
http://hdl.handle.net/11536/144042
ISSN: 0168-9002
DOI: 10.1016/j.nima.2017.01.011
期刊: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume: 850
起始頁: 72
結束頁: 77
Appears in Collections:Articles