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Title |
Other Keywords |
Page |
| MOPB018 |
Longitudinal Beam Dynamics Design for Super Tau-Charm Facility |
luminosity, impedance, collective-effects, synchrotron |
45 |
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- L.H. Zhang, J.Y. Tang
USTC/SNST, Hefei, Anhui, People’s Republic of China
- S.Y. Li, T. Liu, Q. Luo
USTC/NSRL, Hefei, Anhui, People’s Republic of China
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The project of Super Tau-Charm Facility (STCF) pro-posed in China, as a new-generation high-luminosity e⁺/e⁻ collider in the low-energy region with the center-of-mass energy of 2¿7 GeV, is well underway. The luminosity is targeted at 1.0×1035 cm-2s⁻¹ at the optimized beam energy of 2 GeV. Longitudinal beam dynamics becomes of great importance for the STCF due to the constraints from the novel beam-beam effect called coherent X-Z instability and severe beam collective effects. In this paper, we will develop an iterative optimization model for the STCF longitudinal beam dynamics design, which takes into account the influence of transverse dynamics, coherent X-Z instability, and collective effects.
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-SAP2023-MOPB018
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| About • |
Received ※ 30 June 2023 — Accepted ※ 11 July 2023 — Issued ※ 01 November 2023 |
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| Cite • |
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| MOPB028 |
Investigation on the Trapped Modes of CPMU at HEPS |
impedance, synchrotron, simulation, wakefield |
62 |
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- S. Yue, J.T. Li, S.K. Tian, N. Wang
IHEP, Beijing, People’s Republic of China
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The Cryogenic Permanent Magnet Undulator (CPMU) is a crucial component in synchrotron radiation sources. Due to the small magnet gap of CPMU, the interaction between the beam and its surroundings is strong, which can result in a significant contribution to coupling impedance. In this work, the influence of CPMU on coupling impedance was investigated using wakefield and eigenmode solvers. The results indicated that some of the transverse impedance resonances in CPMU were much stronger than the impedance threshold determined by synchrotron radiation damping, which could cause vertical beam instability. To address this issue, different types of damping materials were investigated through simulations to suppress the resonances.
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-SAP2023-MOPB028
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| About • |
Received ※ 10 July 2023 — Revised ※ 11 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 01 October 2023 |
| Cite • |
reference for this paper using
※ BibTeX,
※ LaTeX,
※ Text/Word,
※ RIS,
※ EndNote (xml)
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