Electron-cloud mitigation in the Spallation Neutron Source ring

Author

Wei, Jason ; Blaskiewicz, M. ; Brodowski, J. ; Cameron, P. ; Davino, D. ; Fedotov, A. ; He, P. ; Hseuh, H. ; Lee, Y.Y. ; Ludewig, H. ; Meng, W. ; Raparia, D. ; Tuozzolo, J. ; Zhang, S.Y. ; Aleksandrov, A. ; Cousineau, S. ; Danilov, V. ; Henderson, S. ; Fu

Author_Institution

Brookhaven Nat. Lab., Upton, NY, USA

Volume

4

fYear

2003

fDate

12-16 May 2003

Firstpage

2598

Abstract

The Spallation Neutron Source (SNS) accumulator ring is designed to accumulate, via H^- injection, protons of 2 MW beam power at 1 GeV kinetic energy at a repetition rate of 60 Hz. At such beam intensity, electron-cloud is expected to be one of the intensity-limiting mechanisms that complicate ring operations. This paper summarizes mitigation strategy adopted in the design, both in suppressing electron-cloud formation and in enhancing Landau damping, including tapered magnetic field and monitoring system for the collection of stripped electrons at injection, TiN coated beam chamber for suppression of the secondary yield, clearing electrodes dedicated for the injection region and parasitic on BPMs around the ring, solenoid windings in the collimation region, and planning of vacuum systems for beam scrubbing upon operation.

Keywords

accelerator magnets; particle beam diagnostics; particle beam injection; proton accelerators; solenoids; storage rings; titanium compounds; BPM; H^- injection; Landau damping; SNS; Spallation Neutron Source accumulator ring; TiN; TiN coated beam chamber; beam intensity; beam scrubbing; clearing electrodes; collimation region; electron-cloud mitigation; intensity-limiting mechanisms; monitoring system; protons; repetition rate; secondary yield suppression; solenoid windings; stripped electrons; tapered magnetic field; vacuum systems; Damping; Electron beams; Kinetic energy; Magnetic fields; Monitoring; Neutrons; Particle beam injection; Particle beams; Protons; Tin;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1289201

Filename

1289201