| Article | |
| Title | Longitudinal Collective Effects at Beam Transfer from PS to SPS at CERN |
| Author(s) | Lasheen, Alexandre (CERN) ; Damerau, Heiko (CERN) ; Karpov, Ivan (CERN) ; Papotti, Giulia (CERN) ; Vinten, Evin (CERN) |
| Publication | 2024 |
| Number of pages | 4 |
| In: | JACoW HB 2023 (2024) 587-590 |
| In: | 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.587-590 |
| DOI | 10.18429/JACoW-HB2023-THBP45 |
| Subject category | Accelerators and Storage Rings |
| Abstract | The hardware upgrades of the LHC Injectors Upgrade (LIU) project at CERN were completed during the Long Shutdown 2 (2019-2021) to prepare the injectors for the beams required by the High Luminosity (HL) LHC. Doubling the bunch intensity leads to new challenges due to collective effects. Although many bottlenecks were already solved, a remaining limitation is the important loss of particles at transfer from the Proton Synchrotron (PS) to the Super Proton Synchrotron (SPS). The maximum transmission achieved since the restart in 2021 is in the order of 90%, yet leading to unnecessary activation of the SPS. The losses are distributed at various instants of the SPS cycle: fast intensity decay right after injection, slow losses along the injection plateau while waiting for multiple injections from the PS, and uncaptured beam removed at start of acceleration. In this contribution, the focus is on longitudinal aspects of transfer losses and more specifically on intensity effects during the non-adiabatic bunch shorting performed in the PS prior to extraction, as well as on the longitudinal mismatch at injection due to misaligned bunch phases in the SPS caused by transient beam loading. |
| Copyright/License | © 2024-2025 the author(s) (License: CC-BY-3.0) |
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