Modelling and beam instability studies for Future ERL-based Applications

by Mr Lode Vanhecke

Wednesday 25 Nov 2026, 14:30 → 15:30 Europe/Zurich

WBGB/019

Energy Recovery Linacs (ERLs) demand precise control of collective effects to sustain high-current, high-energy operation while preserving efficient energy recovery. Beam loading and beam break-up (BBU) set fundamental stability limits, so higher-order mode (HOM) damping and beam-current tolerances must be quantified to suppress destructive modes and to define the thresholds at which BBU and beam loading drive unacceptable transverse or longitudinal emittance growth. These limits are studied for the energy-efficient cryomodules being developed by Innovate for Sustainable Accelerating Systems (iSAS). Multi-pass beam-cavity coupling is modelled with a self-consistent particle-tracking framework in which multi-bunch beams are dynamically routed through multiple beamlines according to their evolving phase-space parameters, and HOM wakefields, implemented natively in RF-Track, are excited and evaluated over successive recirculation passes, including the accumulation of wakefields from previously transported bunches. The methodology supports assessment of the achievable beam performance within the iSAS cryomodules, their future use in ERL-based colliders, and the evaluation of overall energy-recovery efficiency.