Coupling effects of beam-beam interaction and longitudinal impedance
Recent studies have shown a novel coherent head-tail instability induced by beam-beam interaction with a large Piwinski angle. The instability has become an important issue during the designs of CEPC and FCC-ee. Simulations have further revealed that the longitudinal impedance has a strong impact on...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-01-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.25.011001 |
| _version_ | 1818952539212611584 |
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| author | Chuntao Lin Kazuhito Ohmi Yuan Zhang |
| author_facet | Chuntao Lin Kazuhito Ohmi Yuan Zhang |
| author_sort | Chuntao Lin |
| collection | DOAJ |
| description | Recent studies have shown a novel coherent head-tail instability induced by beam-beam interaction with a large Piwinski angle. The instability has become an important issue during the designs of CEPC and FCC-ee. Simulations have further revealed that the longitudinal impedance has a strong impact on the beam stability, squeezing the horizontal stable tune area seriously. The cross-wake force has been introduced to represent beam-beam interaction. A mode coupling theory based on the localized wake (impedance) force has been developed to explain the instability. However, the theory did not consider the effects of longitudinal impedance. In this paper, we develop a new transverse mode coupling analysis method that could be used to study the beam-beam instability with and without longitudinal impedance. The result shows that the distortion of longitudinal phase space trajectory and the incoherent synchrotron tune shift induced by longitudinal impedance would reduce the stable tune area. |
| first_indexed | 2024-12-20T09:51:59Z |
| format | Article |
| id | doaj.art-694913cf364142c98d953269566b719a |
| institution | Directory Open Access Journal |
| issn | 2469-9888 |
| language | English |
| last_indexed | 2024-12-20T09:51:59Z |
| publishDate | 2022-01-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Accelerators and Beams |
| spelling | doaj.art-694913cf364142c98d953269566b719a2022-12-21T19:44:34ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882022-01-0125101100110.1103/PhysRevAccelBeams.25.011001Coupling effects of beam-beam interaction and longitudinal impedanceChuntao LinKazuhito OhmiYuan ZhangRecent studies have shown a novel coherent head-tail instability induced by beam-beam interaction with a large Piwinski angle. The instability has become an important issue during the designs of CEPC and FCC-ee. Simulations have further revealed that the longitudinal impedance has a strong impact on the beam stability, squeezing the horizontal stable tune area seriously. The cross-wake force has been introduced to represent beam-beam interaction. A mode coupling theory based on the localized wake (impedance) force has been developed to explain the instability. However, the theory did not consider the effects of longitudinal impedance. In this paper, we develop a new transverse mode coupling analysis method that could be used to study the beam-beam instability with and without longitudinal impedance. The result shows that the distortion of longitudinal phase space trajectory and the incoherent synchrotron tune shift induced by longitudinal impedance would reduce the stable tune area.http://doi.org/10.1103/PhysRevAccelBeams.25.011001 |
| spellingShingle | Chuntao Lin Kazuhito Ohmi Yuan Zhang Coupling effects of beam-beam interaction and longitudinal impedance Physical Review Accelerators and Beams |
| title | Coupling effects of beam-beam interaction and longitudinal impedance |
| title_full | Coupling effects of beam-beam interaction and longitudinal impedance |
| title_fullStr | Coupling effects of beam-beam interaction and longitudinal impedance |
| title_full_unstemmed | Coupling effects of beam-beam interaction and longitudinal impedance |
| title_short | Coupling effects of beam-beam interaction and longitudinal impedance |
| title_sort | coupling effects of beam beam interaction and longitudinal impedance |
| url | http://doi.org/10.1103/PhysRevAccelBeams.25.011001 |
| work_keys_str_mv | AT chuntaolin couplingeffectsofbeambeaminteractionandlongitudinalimpedance AT kazuhitoohmi couplingeffectsofbeambeaminteractionandlongitudinalimpedance AT yuanzhang couplingeffectsofbeambeaminteractionandlongitudinalimpedance |