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Ultrahigh accelerating gradient and quality factor of CEPC 650 MHz superconducting radio-frequency cavity

Nuclear Science and Techniques 2022年第10期33卷 33-40页

作者： Peng Sha Wei-Min Pan Song Jin Ji-Yuan Zhai Zheng-Hui Mi Bai-Qi Liu Chao Dong Fei-Si He Rui Ge Liang-Rui Sun Shi-Ao Zheng Ling-Xi Ye Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Acceleration Physics and Technology Chinese Academy of SciencesBeijing 100049China Center for Superconducting RF and Cryogenics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Two 650 MHz single-cell superconducting radio-frequency(srf)cavities used for the Circular Electron Positron Collider(CEPC)were studied to achieve a high accelerating gradient(E_(acc))and high intrinsic quality factor(Q_(0)).The 650 MHz single-cell cavities were subjected to a combination of buffered chemical polishing(BCP)and electropolishing(EP),and their E_(acc) exceeded40 MV/*** a high E_(acc) may result from the cold EP with more uniform *** is easy,cheap,and rough,whereas EP is complicated,expensive,and precise Therefore,the combination of BCP and EP investigated in this study is suitable for surface treatments of mass srf *** temperature(mid-T)furnace baking was also conducted,which demonstrated an ultrahigh Q_(0) of 8×10^(10) at 22 MV/m for both cavities,and an extremely low BCS resistance(R_(BCS))of~1.0 nΩwas achieved a2.0 K.

关键词： srf cavity Accelerating gradient Quality factor Electropolishing Vertical test

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Electron bunch train excited higher-order modes in a superconducting RF cavity

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Chinese Physics C 2017年第4期41卷 164-168页

作者：高永凤黄森林王芳冯立文庄德浩林林朱凤郝建奎全胜文刘克新 Institute of Heavy Ion Physics and State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

Higher-order mode（HOM） based intra-cavity beam diagnostics has been proved effective and convenient in superconducting radio-frequency（srf） *** recent research shows that the beam harmonics in the bunch train excited HOM spectrum,which have much higher signal-to-noise ratio than the intrinsic HOM peaks,may also be useful for beam *** this paper,we will present our study on bunch train excited HOMs,including a theoretical model and recent experiments carried out based on the DC-srf photoinjector and srf linac at Peking University.

关键词： HOMs bunch train srf cavity beam diagnostics

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Measurements of Static Heat Loss and Unloaded Q_0 on the BEPCⅡ srf Cavities

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Chinese Physics C 2008年第z1期32卷 166-168页

作者：边琳李少鹏刘亚萍中国科学院高能物理研究所北京100049

The static heat loss and unloaded Q_0 are the most important values for both the cryogenic and the RF *** BEPCⅡ srf cavity operates in a liquid helium bath contained in a vacuum insulated,liquid nitrogen cooled radiation shielded *** the horizontal test at the test station,thermodynamic method is used to measure and calculate the static loss and Q_0 value of the srf *** paper has briefly introduced the method and process to measure the static loss and Q_0 value of the srf *** results under different experimental conditions are presented as important data for acceptance test of the srf cavity.

关键词： BEPCⅡ cryogenic srf cavity heat loss unloaded Q_0

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