| Internal Note | |
| Report number | CERN-ACC-NOTE-2016-0019 |
| Title | Long range beam-beam interaction and the effect on the beam and luminosity lifetimes |
| Author(s) | Crouch, Matthew (University of Manchester, Manchester, U.K / The Cockcroft) ; Pieloni, Tatiana (CERN) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Banfi, Danilo ; Buffat, Xavier (CERN) ; Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Alexahin, Yuri ; Bruce, Roderik (CERN) ; Giachino, Rossano (CERN) ; Pojer, Mirko (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Trad, Georges (CERN) |
| Corporate author(s) | CERN. Geneva. ATS Department |
| Publication | 2016 |
| Imprint | 18 Jan 2016 |
| Number of pages | 12 |
| Note | Research supported by the High luminosity LHC project |
| Subject category | Accelerators and Storage Rings |
| Accelerator/Facility, Experiment | CERN LHC |
| Keywords | CERN LHC ; Beam-Beam Effects |
| Abstract | Identifying the minimum crossing angle achievable in the LHC is a key parameter to identify the collider luminosity reach. In this note, we summarise the observations collected during a dedicated experiment performed in 2015, where the strength of the long range beam-beam interaction is varied by reducing the crossing angle at IP1 and IP5. The crossing angle and the impact of the long range beam-beam interaction is analysed with respect to the beam and luminosity lifetimes. The effect of reducing Landau octupoles initially operating at 476 [A] and high chromaticity values (15 units) are also shown. The minimum crossing angle achievable with collisions is identified, together with the impact on beam and luminosity lifetimes |
| Submitted by | [email protected] |
Record created 2016-01-18, last modified 2016-06-30
