| Internal Note | |
| Report number | CERN-ACC-NOTE-2021-0002 |
| Title | Different approaches for minimising proton beam losses on the 11 T dipole in the IR7 dispersion suppressor |
| Author(s) | Belli, Eleonora ; Bruce, Roderik (CERN) ; Giovannozzi, Massimo (CERN) ; Mereghetti, Alessio ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN) |
| Corporate author(s) | CERN. Geneva. ATS Department |
| Publication | 2021 |
| Imprint | 14 Jan 2021 |
| Subject category | Accelerators and Storage Rings |
| Accelerator/Facility, Experiment | CERN LHC |
| Project | CERN HL-LHC |
| Abstract | The High Luminosity Large Hadron Collider (HL–LHC) project aims at increasing the integrated luminosity by a factor of 10 beyond the LHC design value. With the increased intensities of the proton beams expected for HL–LHC, the losses on superconducting magnets in the dispersion suppressor (DS) regions of the accelerator could limit the machine performance by inducing magnet quenches. In order to improve the collimation cleaning, the HL–LHC upgrade baseline foresees to replace one standard 8.33 T main dipole with a pair of shorter and stronger 11 T dipoles and a collimator (Target Collimator Long Dispersion suppressor, TCLD) installed in between for each beam and on each side of the betatron cleaning insertion. Different locations were compared for the optimal installation of the TCLD in terms of global and local cleaning, leading to the choice of cell 9 as baseline location. This note reviews different mitigation strategies and techniques performed to minimize the amount of losses reaching the upstream 11 T dipole that is not protected by the new collimator. Possible operational scenarios are also presented. |
| Submitted by | [email protected] |
Journalen skapades 2021-01-14, och modifierades senast 2021-04-26
