| Internal Note | |
| Report number | CERN-ACC-NOTE-2020-0046 |
| Title | Simulations of particle loss due to hollow e-lens and non-linearities for the HL-LHC |
| Author(s) | Cai, Rongrong (Imperial College (GB)) ; Mirarchi, Daniele (University of Manchester (GB)) ; Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH)) |
| Corporate author(s) | CERN. Geneva. ATS Department |
| Publication | 2020 |
| Imprint | 13 Aug 2020 |
| Number of pages | 19 |
| Subject category | Accelerators and Storage Rings |
| Project | CERN HL-LHC |
| Abstract | Simulations on the effects of an electron lens (e-lens) on the halo population depletion have been carried out for the High Luminosity LHC (HL-LHC). In particular, the different operational modes, and the interaction with the non-linearities introduced by octupoles and chromaticity have been explored. This study has found that the random activation of the electron beam removes completely the halo above its inner radius on a timescale of 10 s. For all other operational modes, the octupole current variation increases the loss to higher values and to different rates depending on the specific mode and current value. Also, the increase of chromaticity causes a growth in population loss. Finally, an estimation is given for chromaticity and octupole current at HL-LHC baseline values. |
| Submitted by | [email protected] |
Notice créée le 2020-09-23, modifiée le 2020-09-25
