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Analysis of the impacts of mechanical errors on the RF performance of a single spoke cavity

Chinese Physics C 2010年第5期34卷 576-579页

作者：姚中元鲁向阳张保澄全胜文贺斐思赵夔 State Key Laboratory of Nuclear Physics and Technology Peking University

Mechanical errors can not be avoided in fabrication. They will cause geometry errors and have impacts on the cavity performance. This paper systematically analyzes the impacts of mechanical errors on the RF performance of Peking University single spoke cavity. The various kinds of shape and size errors are considered, the influences on the resonation frequency and field flatness are studied by numerical simulation and the theoretical models are analyzed. The results show that the single spoke cavity is robust with respect to the mechanical tolerance. It also indicates the most essential factors for fabrication.

关键词： single spoke cavity mechanical errors field flatness perturbation

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RF design of a compact 648 MHz single spoke cavity at CSNS

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Radiation Detection Technology and Methods 2019年第3期3卷 301-306页

作者： Yun Wang Huachang Liu Jianping Dai Peng Sha Ziwei Deng Bo Li Mengxu Fan Ahong Li Peihua Qu Xiaolei Wu Qiang Chen Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China University of Chinese Academy of Sciences Beijing 100049China

Purpose In order to increase CSNS beam power from 100 to 500 kW,the linac injection energy needs to be increased from 80 to 300 *** combined layout of superconducting spoke cavities and lliptical cavities will be adopted to accelerate H-beam to 300 *** this paper,a compact single spoke cavity withφ50-mm beam aperture was proposed,with the RF performance of the spoke cavity optimized to E_(p)/E_(acc).cavity geometry *** electromagnetic design was finished,multipacting behavior was studied with CST Particle Studio module,and cavity shape modification was made to get a reasonable*** The simulation got optimum results of E_(peak)/E_(acc)=4.97 and B_(peak)/E_((acc)=8.42 mT/(MV/m),and themax is 1.52at E_(acc)=7.74 MV/*** A 648 MHzβ=0.4 single spoke cavity with beam apertureФ50 mm was proposed in the *** compact cavity may be a very promising option for CSNS linac *** addition to the optimization of the RF parameters,the multipacting behavior of the cavity is also studied,and cavity shape is optimized to reducevalue.

关键词： single spoke cavity RF performance optimization Multipacting simuaion

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Design of a 325 MHz SC spoke040 cavity at IHEP

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Chinese Physics C 2014年第11期38卷 76-81页

作者：彭应华张新颖李菡沙鹏李中泉潘卫民 University of Chinese Academy of Sciences Institute of High Energy Physics Chinese Academy of Sciences

A spoke cavity is a TEM-class superconducting resonator with particular advantages： compact structure and high shunt impedance. The 325 MHz β=0.40 （β=v/c, v is the velocity of particle and c is the velocity of light） single spoke cavity （spoke040） is adopted for the Chinese ADS （Accelerator Driven Sub-critical System） project. The physics and mechanical design has been accomplished, and the fabrication of a prototype is currently in progress. In this paper, the optimization processes for the main radio frequency （RF） and mechanical parameters are analyzed in detail. Two kinds of cavity end-walls （flat and convex） are compared. The convex end-wall is preferred in order to improve mechanical performance of the cavity. Two and should be finished in early 2014. Vertical testing prototypes of the spoke040 cavity are in the machining stage is also under preparation.

关键词： single spoke cavity superconducting RF mechanical performance

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The run management system for CSNS

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Radiation Detection Technology and Methods 2019年第3期3卷 141-147页

作者： Yuliang Zhang Mingtao Kang Dapeng Jin Yongcheng He Peng Zhu Xuan Wu Fengqin Guo Lin Wang Wenchun Gao Gang Li Institute of High Energy Physics Beijing 100049China Dongguan Neutron Science Center Dongguan 523803China University of Chinese Academy of Sciences Beijing 100049China

Purpose In order to increase CSNS beam power from 100 to 500 kW,the linac injection energy needs to be increased from 80 to 300 *** combined layout of superconducting spoke cavities and elliptical cavities will be adopted to accelerate H−beam to 300 *** this paper,a compact single spoke cavity withΦ50-mm beam aperture was proposed,with the RF performance of the spoke cavity optimized to Ep/Eacccavity geometry *** electromagnetic design was finished,multipacting behavior was studied with CST Particle Studio module,and cavity shape modification was made to get a reasonable*** The simulation got optimum results of Epeak/Eacc=4.97 and Bpeak/Eacc=8.42 mT/(MV/m),and themax is 1.52 at Eacc=7.74 MV/*** A 648 MHzβg=0.4 single spoke cavity with beam apertureΦ50 mm was proposed in the *** compact cavity may be a very promising option for CSNS linac *** addition to the optimization of the RF parameters,the multipacting behavior of the cavity is also studied,and cavity shape is optimized to reducevalue.

关键词： single spoke cavity RF performance optimization Multipacting simulation

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