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Analysis and simulation of the tune ripple effect on beam spill ripple in RF-KO slow extraction

Nuclear Science and Techniques 2022年第5期33卷 91-101页

作者： Wen-Bo Ye Hong-Juan Yao Shu-Xin Zheng Xia-Ling Guan Xue-Wu Wang Key Laboratory of Particle and Radiation Imaging(Tsinghua University) Ministry of EducationBeijing 100084China Laboratory for Advanced Radiation Sources and Application Tsinghua UniversityBeijing 100084China Department of Engineering Physics Tsinghua UniversityBeijing 100084China

Tune ripple has a significant influence on beam spill ripple in RF-knockout(RF-KO)slow *** this study,a model was proposed to explain how the tune ripple affects the beam spill in RF-KO slow extraction;consequently,a simulation was performed using the lattice of the Xi’an Proton Application Facility(XiPAF)synchrotron to verify the *** simulation demonstrates that the tune ripple influences the beam spill in two *** the one hand,the tune ripple causes a direct fluctuation in the separatrix area,which induces beam spill *** the other hand,the tune ripple influences the emittance growth rate in RF-knockout slow *** two aspects simultaneously contribute to the beam spill ripple.

关键词： RF-knockout slow extraction Synchrotron Tune ripple power supply ripple Beam spillripple

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Simulation and analysis of the transverse spectrum in HIRFL-CSR

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Chinese Physics C 2011年第2期35卷 183-187页

作者：李朋原有进冒立军杨建成李国宏殷达鈺李杰李小妮柴伟平石健 Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

Particles in a storage ring oscillate in the longitudinal and transverse dimensions. Therefore, the signal that beam has generated can be analyzed in the frequency domain to extract many beam parameters, such as tune, momentum spread, emittance and their evolution with time and so on. In this paper, the transverse spectrum in HIRFL-CSR was simulated and analyzed under different conditions, including electron cooling, hollow electron beam, solenoid effect, the tune shift caused by power supply ripple and the misalignment between ion and electron beams. The result of the simulation shows that the longitudinal magnetic field of the electron cooling device should be compensated by a ＂compensation solenoid＂, and the power supply ripple must be controlled, otherwise the accumulation would be affected and the beam would be lost.

关键词： HIRFL-CSR transverse spectrum solenoid electron beam power supply ripple

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