HOM damping requirements and measurements for CEPC 650-MHz 2-cell cavity
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The circular electron–positron collider (CEPC) will use a 650-MHz RF system with 240 two-cell cavities for the collider. The collider is a double ring with shared cavities for Higgs operation and separate cavities for W and Z operations. The higher-order modes (HOM) excited by the intense beam bunches must be damped to avoid additional cryogenic loss and multi-bunch instabilities.
Materials and methods
To get the real damping results, two prototypes of HOM coupler have been fabricated and installed on the 650-MHz two-cell cavity. The HOMs have been verified by bead pulling method. A test bench with two 2-cell cavities is used to measure the real damping results and study HOM propagating properties for a cavity string.
In this paper, the impedance budget, HOM damping and HOM power requirements for the CEPC collider ring are given. The damping results measured for the fundamental mode and HOMs seem good compared with the simulated results. The absorbing efficiency of the absorber and the extraction power efficiency of HOM couplers were also achieved.
KeywordsHOM damping HOM power Coupled-bunch instabilities HOM measurement HOM propagating properties
We would like to thank Na Wang from IHEP for some useful discussions about the coupled-bunch instabilities. This work was supported by National Key Programme for S&T Research and Development (Grant No.: 2016YFA0400400), National Natural Science Foundation of China (No.: 11905232) and Xie Jialin Funding (Grant No.: 542018IHEPZZBS10505) from IHEP.
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