Abstract
The power loss of cavity high-order modes (HOMs) is a key issue in Circular Electron and Positron Collider (CEPC) RF system design. A large HOM power may cause a quench of SC cavity. The purpose of this article is to study the beam-induced HOM power for CEPC collider ring. The factors influencing the cavity HOM power are also investigated. Starting with the beam filling patterns, the beam spectrums of different beam time structures are deduced. Then, the longitudinal impedance is simulated for CEPC 2-cell 650 MHz cavity. Finally, the cavity HOM power is calculated for CEPC CDR design. The cavity HOM power is 459 W for Higgs, 506 W for W and 1026 W for Z-pole. These values are smaller than the average values. There is no overlap between beam spectral lines and cavity HOM frequency. The filling patterns of CEPC CDR Higgs, W and Z are safe. The dangerous filling patterns can be identified for CEPC Z-pole by scanning different parameters.
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