| Paper | Title | Page |
|---|---|---|
| MOCXA02 | Beam-Beam Interaction with Longitudinal Impedance and Its Application in TMCI Study | 1 |
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| Simulations have showed a novel coherent head-tail instability induced by beam-beam interaction with a large Piwinski angle. The localized cross-wake force has been introduced to explain the instability. The longitudinal impedance would cause coherent and incoherent synchrotron tune shift and distort the particle¿s trajectories in longitudinal phase space. Further beam-beam simulation revealed that the longitudinal impedance has strong impacts on the beam stability, squeezing the horizontal stable tune area seriously. The instability has become an important issue during the designs of CEPC and FCC-ee. In this paper, we develop a transverse mode coupling analysis method that could be used to study beam-beam instability with and without longitudinal impedance. This method can also be applied in synchrotron light sources to study transverse mode coupling instability (TMCI) with longitudinal impedance and harmonic cavity. Some preliminary results at Shenzhen Innovation Light Source (SILF) are also shown. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOCXA02 | |
| About • | Received ※ 30 June 2023 — Accepted ※ 11 July 2023 — Issued ※ 23 September 2024 | |
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| MOPB014 | Development of a Vlasov Solver for Arbitrary Sub-optimal Lengthening Conditions in Double-RF System | 34 |
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| Solving Vlasov equation is a classic method for analyzing collective beam instabilities. Considering longitudinal impedance and the nonlinear longitudinal potential well, we developed a new Vlasov solver which can be used to study the transverse mode-coupling instability under the arbitrary sub-optimal lengthening and the optimal lengthening conditions in a double-RF system. Several different techniques to deal with the radial direction of longitudinal phase space have been tested. Numerical discretization method is selected in this paper. The development of the solver is presented in details here. Benchmarks and crosscheck of the solver have been made and presented as well. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB014 | |
| About • | Received ※ 30 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 21 August 2024 | |
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| MOPB019 | Development Status of Beam Dynamics Software APES for CEPC | 49 |
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Funding: Innovative Fund of IHEP The physical design and research work of China Electron Positron Collider (CEPC) is an unprecedented challenge in the field of international accelerator collider. In the simulation research, many physical phenomena must be considered, including large Piwinski angle, crab waist colliding, strong nonlinear effect, energy sawtooth, beam-beam, etc. To address this challenge, a software project APES is proposed in 2021. And this project received support from the IHEP innovative fund in 2022. The progress and future plans of APES project will be introduced in the poster. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB019 | |
| About • | Received ※ 05 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 16 September 2024 | |
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