IPAC'24 - 15th International Particle Accelerator Conference

Studies and mitigation of TMCI in FCC-ee

THPC60

23 May 2024, 16:00

2h

Country (MCC Exhibit Hall A)

Poster Presentation MC5.D04 Beam Coupling Impedance Theory, Simulations, Measurements, Code Development Thursday Poster Session

Speaker

Chiara Antuono (European Organization for Nuclear Research)

Description

Previous studies have identified turbulent mode coupling instability (TMCI) as one of the most severe single-bunch instabilities in the FCC-ee collider, potentially limiting its performance. Its threshold is influenced by both transverse and longitudinal wakefields arising from vacuum chamber resistive wall effects, discontinuities, and beam-beam interactions, the latter of which can be seen as a transverse cross-wake force.
In this paper, we investigate the TMCI using the most recent collider parameters and an updated impedance model. We also explore various mitigation techniques aimed at increasing the instability threshold, including positive chromaticity and a feedback system.

Funding Agency

WorkpartiallysupportedbytheEuropeanUnion’sHorizon2020research and innovation programme under grant No 951754 - FCCIS Project, and by INFN National committee I through the RD_FCC project