Beam dynamics aspects of crab cavities in the CERN Large Hadron Collider
Modern colliders bring into collision a large number of bunches to achieve a high luminosity. The long-range beam-beam effects arising from parasitic encounters at such colliders are mitigated by introducing a crossing angle. Under these conditions, crab cavities (CC) can be used to restore effectiv...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2009-10-01
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| Series: | Physical Review Special Topics. Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevSTAB.12.101002 |
| _version_ | 1819109228053266432 |
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| author | Yi-Peng Sun (孙一鹏) Ralph Assmann Javier Barranco Rogelio Tomás Thomas Weiler Frank Zimmermann Rama Calaga Akio Morita (森田 昭夫) |
| author_facet | Yi-Peng Sun (孙一鹏) Ralph Assmann Javier Barranco Rogelio Tomás Thomas Weiler Frank Zimmermann Rama Calaga Akio Morita (森田 昭夫) |
| author_sort | Yi-Peng Sun (孙一鹏) |
| collection | DOAJ |
| description | Modern colliders bring into collision a large number of bunches to achieve a high luminosity. The long-range beam-beam effects arising from parasitic encounters at such colliders are mitigated by introducing a crossing angle. Under these conditions, crab cavities (CC) can be used to restore effective head-on collisions and thereby to increase the geometric luminosity. Such crab cavities have been proposed for both linear and circular colliders. The crab cavities are rf cavities operated in a transverse dipole mode, which imparts on the beam particles a transverse kick that varies with the longitudinal position along the bunch. The use of crab cavities in the Large Hadron Collider (LHC) may not only raise the luminosity, but it could also complicate the beam dynamics, e.g., crab cavities might not only cancel synchrobetatron resonances excited by the crossing angle but they could also excite new ones, they could reduce the dynamic aperture for off-momentum particles, they could influence the aperture and orbit, also degrade the collimation cleaning efficiency, and so on. In this paper, we explore the principal feasibility of LHC crab cavities from a beam dynamics point of view. The implications of the crab cavities for the LHC optics, analytical and numerical luminosity studies, dynamic aperture, aperture and beta beating, emittance growth, beam-beam tune shift, long-range collisions, and synchrobetatron resonances, crab dispersion, and collimation efficiency will be discussed. |
| first_indexed | 2024-12-22T03:22:29Z |
| format | Article |
| id | doaj.art-b329429ae009411f894f9da02dfac8f9 |
| institution | Directory Open Access Journal |
| issn | 1098-4402 |
| language | English |
| last_indexed | 2024-12-22T03:22:29Z |
| publishDate | 2009-10-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Special Topics. Accelerators and Beams |
| spelling | doaj.art-b329429ae009411f894f9da02dfac8f92022-12-21T18:40:41ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022009-10-01121010100210.1103/PhysRevSTAB.12.101002Beam dynamics aspects of crab cavities in the CERN Large Hadron ColliderYi-Peng Sun (孙一鹏)Ralph AssmannJavier BarrancoRogelio TomásThomas WeilerFrank ZimmermannRama CalagaAkio Morita (森田 昭夫)Modern colliders bring into collision a large number of bunches to achieve a high luminosity. The long-range beam-beam effects arising from parasitic encounters at such colliders are mitigated by introducing a crossing angle. Under these conditions, crab cavities (CC) can be used to restore effective head-on collisions and thereby to increase the geometric luminosity. Such crab cavities have been proposed for both linear and circular colliders. The crab cavities are rf cavities operated in a transverse dipole mode, which imparts on the beam particles a transverse kick that varies with the longitudinal position along the bunch. The use of crab cavities in the Large Hadron Collider (LHC) may not only raise the luminosity, but it could also complicate the beam dynamics, e.g., crab cavities might not only cancel synchrobetatron resonances excited by the crossing angle but they could also excite new ones, they could reduce the dynamic aperture for off-momentum particles, they could influence the aperture and orbit, also degrade the collimation cleaning efficiency, and so on. In this paper, we explore the principal feasibility of LHC crab cavities from a beam dynamics point of view. The implications of the crab cavities for the LHC optics, analytical and numerical luminosity studies, dynamic aperture, aperture and beta beating, emittance growth, beam-beam tune shift, long-range collisions, and synchrobetatron resonances, crab dispersion, and collimation efficiency will be discussed.http://doi.org/10.1103/PhysRevSTAB.12.101002 |
| spellingShingle | Yi-Peng Sun (孙一鹏) Ralph Assmann Javier Barranco Rogelio Tomás Thomas Weiler Frank Zimmermann Rama Calaga Akio Morita (森田 昭夫) Beam dynamics aspects of crab cavities in the CERN Large Hadron Collider Physical Review Special Topics. Accelerators and Beams |
| title | Beam dynamics aspects of crab cavities in the CERN Large Hadron Collider |
| title_full | Beam dynamics aspects of crab cavities in the CERN Large Hadron Collider |
| title_fullStr | Beam dynamics aspects of crab cavities in the CERN Large Hadron Collider |
| title_full_unstemmed | Beam dynamics aspects of crab cavities in the CERN Large Hadron Collider |
| title_short | Beam dynamics aspects of crab cavities in the CERN Large Hadron Collider |
| title_sort | beam dynamics aspects of crab cavities in the cern large hadron collider |
| url | http://doi.org/10.1103/PhysRevSTAB.12.101002 |
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