Magnetic fringe field interference between the quadrupole and corrector magnets in the CSNS/RCS

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• 作者：Mei Yang^a ; ^b ; ^c ; ^{yangmei@ihep.ac.cn} ; Wen Kang^a ; ^b ; ^c ; Changdong Deng^a ; ^b ; ^c ; Xianjing Sun^a ; Li Li^a ; ^b ; ^c ; Xi Wu^a ; ^b ; ^c ; Lingling Gong^a ; ^d ; Da Cheng^a ; ^d ; Yingshun Zhu^a ; Fusan Chen^a
• 关键词：Magnetic fringe field ; Magnetic interference ; Field simulation ; OPERA
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：847
• 期：Complete
• 页码：29-33
• 全文大小：538 K
• 卷排序：847

文摘

The Rapid Cycling Synchrotron (RCS) of the China Spallation Neutron Source (CSNS) employs large aperture quadrupole and corrector magnets with small aspect ratios and relatively short iron to iron separations; so the fringe field interference becomes serious which results in integral field strength reduction and extra field harmonics. We have performed 3D magnetic field simulations to investigate the magnetic field interference in the magnet assemblies and made some adjustments on the magnet arrangement. The Fourier analysis is used to quantify the integral gradient reduction and field harmonic changes of the quadrupole magnets. Some magnetic field measurements are undertaken to verify the simulation results. The simulation details and the major results are presented in this paper.