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Study and design of cryogenic accelerating structure and RF optimization of single cell for SXFEL energy upgrading

Radiation Detection Technology and Methods 2022年第3期6卷 367-374页

作者： Zi-He Gao Cheng Wang Wen-Cheng Fang Zhen-Tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

Purpose Recent researches of RF gun operated at cryogenic temperature have many advantages to serve as the technology to realize the future light source.In order to further improve the accelerating gradient of accelerators,the cryogenic acceleration structure is studied.Design/methodology/approach The cryogenic accelerating structure is studied by numerical analysis and simulation.Findings In this paper,the low-temperature characteristics of the material are analyzedﬁrstly,and then the preliminary design scheme of the cavity is proposed according to the analysis results.Furthermore,the prototype with RF coupler is designed and optimized systemically,and the modiﬁed Poynting vector distribution is calculated.Finally,the high-power test based on existed setup is also proposed.Originality/value The study of the cryogenic structure in this paper is helpful for improving the accelerating gradient and developing compact accelerators.

关键词： cryogenic structure C-band Copper Residual resistance ratio(RRR) RF breakdown

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Design optimization and cold RF test of a 2.6-cell cryogenic RF gun

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Nuclear Science and Techniques 2021年第9期32卷 84-93页

作者： Cheng Wang Jian-Hao Tan Xiao-Xia Huang Yi-Xing Lu Lin Wang Wen-Cheng Fang Zhen-Tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Synchrotron Radiation Facility Chinese Academy of SciencesShanghai 201204China

To further improve the performance of acceler-ators,the first cryogenic normal-conducting RF gun in China was designed and manufactured.As a new and attractive trend,this optimized cryogenic RF gun can generate a low-emittance beam with a short-driven laser pulse because of its promising high gradient on the cath-ode.In this paper,optimization of the RF design and beam dynamics,including suppression of the peak RF field and elimination of the multipole mode,is presented.In addi-tion,the emittance growth caused by the alignment devi-ation and RF jitter is discussed.After the gun was manufactured,a cold test was conducted at both room temperature and cryogenic conditions.At room tempera-ture,the field distribution was obtained by the bead pull method.Under cryogenic conditions,the RF properties,such as the coupling coefficient and quality factor,varied with temperature.The test results agreed with the design.In the cryogenic test,vibration measurements were performed.Without vibration isolation,a maximum vibration of 50 lm was observed.These cold test results are the basis of the following high-power test.

关键词： Photoinjector cryogenic structure C-band Cold test

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