Impedance driven collective effects in CEPC

Abstract The Circular Electron Positron Collider is a double ring lepton collider covering beam energy from 45 GeV (Z) to 180 GeV (tt-bar). Beam coupling impedance and the collective effects that are triggered by the impedance are important subjects when targeting high machine performance of an elec...

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Bibliographic Details
Published inJournal of instrumentation Vol. 19; no. 2; p. P02016
Main Authors Wang, N., Zhang, Y., Xu, H.S., Liu, Y.D., Li, J.T., Lin, C.T., Wang, Y.T., Zheng, H.J., Zhai, J.Y.
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.02.2024
Subjects
Accelerator modelling and simulations (multi-particle dynamics, single-particle dynamics)
Coherent instabilities
Electron-positron accelerators
Impedance
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Summary:Abstract The Circular Electron Positron Collider is a double ring lepton collider covering beam energy from 45 GeV (Z) to 180 GeV (tt-bar). Beam coupling impedance and the collective effects that are triggered by the impedance are important subjects when targeting high machine performance of an electron positron collider. A robust impedance model is required for the instabilities evaluations as well as to investigate their possible mitigations. Meanwhile, a thorough investigation on the collective effects is essential to identify the critical issues on the beam instabilities. In this paper, a detailed impedance model has been built for the collider ring and dominant impedance contributors have been identified by evaluating the effective impedances. The potential collective instabilities driven by the impedance are also discussed.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/19/02/P02016