IPAC'23 - 14th International Particle Accelerator Conference

Overview of transverse instabilities in the CERN Proton Synchrotron

WEPL148

10 May 2023, 16:30

2h

Sala Laguna

Poster Presentation MC5.D06: Coherent and Incoherent Instabilities Measurements and Countermeasures Wednesday Poster Session

Speaker

Sébastien Joly (European Organization for Nuclear Research)

Description

During Long Shutdown 2 (2019-20), the injector chain of the Large Hadron Collider (LHC) has been upgraded to reach the High Luminosity LHC goals in terms of beam intensity and brightness. In the CERN Proton Synchrotron (PS), this upgrade consisted in hardware modifications to double the intensity at extraction, while preserving the transverse emittance available from the CERN PS Booster. The gradual beam brightness ramp-up in the PS after the restart in 2021 brought to light several impedance-induced instabilities. Each of these instabilities has been thoroughly studied in order to understand the impact of several key beam parameters (chromaticity, RF voltage, damper gain). Instability observations, mitigation strategies as well as comparisons with macroparticle tracking simulations will be presented in this paper.