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residual orbit of BC bump for CSNS/RCS

Radiation Detection Technology and Methods 2019年第3期3卷 262-267页

作者： Ming-Yang Huang Sheng Wang Shouyan Xu Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Institute of Neutron Science Dongguan 523808China

Background In a beam cycle,there is a chicane bump(BC bump)in the injection region of the China Spallation Neutron Source(CSNS).It is a core part of the injection system and the important guarantee that the Linac beam injecting into the rapid cycling synchrotron(RCS).During the beam commissioning,the residual orbit of BC bump,i.e.,the closed-orbit distortion(COD)due to the imperfect BC bump,was an important problem which can affect the orbit correction and beam loss control of the *** The purpose is to develop a suitable method to judge and correct the residual orbit of BC *** According to the physics design,there is no residual orbit of BC bump in ***,if the residual orbit of BC bump exists in the actual operation,the circular beam orbit outside the injection region would be *** comparing the circular beam orbit outside the BC bump region in theory and that is measured in the actual operation,whether the residual orbit of BC bump exists can be *** using the three auxiliary windings of BC magnets,the residual orbit of BC bump can be *** The numerical simulation results showed that the measurement and correction methods had worked well and they can be applied to the beam commissioning of CSNS/*** measurement results in the machine study showed that the residual orbit of BC bump is not large and can be reduced by the three auxiliary windings of BC *** The methods to judge and correct the residual orbit of BC bump worked well and had been applied to the beam commissioning of CSNS/RCS.

关键词： CSNS Injection system BC bump residual orbit

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