Longitudinal Single-Bunch Instability in the ILC Damping Rings: Estimate of Current Threshold

Venturini, Marco ; Venturini, Marco

Lawrence Berkeley National Laboratory

关键词: Numerical Solution;    Linear Colliders;    Boltzmann-Vlasov Equation;    Specifications Collective Instabilities, Damping Rings;    43;   

DOI  :  10.2172/934960
RP-ID  :  LBNL-626E
RP-ID  :  DE-AC02-05CH11231
RP-ID  :  934960

美国|英语

来源: UNT Digital Library

【 摘 要 】

Characterization of single-bunch instabilities in the International Linear Collider (ILC) damping rings (DRs) has been indicated as a high-priority activity toward completion of an engineering design. In this paper we report on a first estimate ofthe current thresholds for the instability using numerical and analytical models of the wake potentials associated with the various machine components. The numerical models were derived (upon appropriate scaling) from designs of the correspondingcomponents installed in existing machines. The current thresholds for instabilities were determined by numerical solution of the Vlasov equation for the longitudinal dynamics. For the DR baseline lattice as of Feb. 2007 we find the critical current forinstability to be safely above the design specifications leaving room for further optimization of the choice of the momentum compaction.