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

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...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2017-03, Vol.847, p.29-33
Main Authors: Yang, Mei, Kang, Wen, Deng, Changdong, Sun, Xianjing, Li, Li, Wu, Xi, Gong, Lingling, Cheng, Da, Zhu, Yingshun, Chen, Fusan
Format: Article
Language:English
Subjects:
Field simulation
Magnetic fringe field
Magnetic interference
OPERA
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Summary: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.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2016.11.013