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

Venturini, Marco ; Venturini, Marco

关键词: 43;    BOLTZMANN-VLASOV EQUATION;    CRITICAL CURRENT;    DAMPING;    DESIGN;    INSTABILITY;    LINEAR COLLIDERS;    NUMERICAL SOLUTION;    OPTIMIZATION;    SPECIFICATIONS collective instabilities;    damping rings;   

DOI  :  10.2172/934960
RP-ID  :  LBNL-626E
PID  :  OSTI ID: 934960
Others  :  TRN: US0804142

美国|英语

来源: SciTech Connect

【 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.