Impedance and instabilities in the NLC damping rings

Author

Corlett, J. ; Li, D. ; Pivi, M. ; Rimmer, Robert ; DeSantis, S. ; Wolski, A. ; Novokhatski, A. ; Ng, C.

Author_Institution

LBNL, Berkeley, CA, USA

Volume

3

fYear

2001

fDate

2001

Firstpage

1841

Abstract

We report on impedance calculations and single-bunch and multi-bunch instabilities in the NLC damping rings. Preliminary designs of vacuum chambers and major components have addressed beam impedance issues, with the desire to increase instability current thresholds and reducing growth rates. MAFIA calculations of short-range and long-range wakefields have allowed computations of growth rates and thresholds, which are presented here. Resistive wall instability dominates long-range effects, and requires a broadband feedback system to control coupled-bunch motion. Growth rates are within the range addressable by current feedback system technologies. Single-bunch instability thresholds are safely above nominal operating current

Keywords

booster injectors; electron accelerators; particle beam bunching; particle beam stability; storage rings; time-domain analysis; MAFIA calculations; NLC damping rings; beam impedance issues; broadband feedback system; growth rates; impedance calculations; instability current thresholds; long-range wakefields; multi-bunch instabilities; resistive wall instability; short-range wakefields; single-bunch instabilities; thresholds; vacuum chambers; Apertures; Control systems; Damping; Electron beams; Feedback; Impedance; Motion control; Positrons; Radio frequency; Vacuum arcs;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.987201

Filename

987201