Electron cloud observations and cures in RHIC

Author

Fischer, W. ; Blaskiewicz, M. ; Brennan, M. ; Huang, H. ; Hseuh, H.C. ; Ptitsyn, V. ; Roser, T. ; Thieberger, P. ; Trbojevic, D. ; Wei, J. ; Zhang, S.Y. ; Iriso, U.

Author_Institution

BNL, Upton

fYear

2007

fDate

25-29 June 2007

Firstpage

759

Lastpage

763

Abstract

Since 2001 RHIC has experienced electron cloud effects, which have limited the beam intensity. These include dynamic pressure rises - including pressure instabilities, tune shifts, a reduction of the stability threshold for bunches crossing the transition energy, and possibly incoherent emittance growth. We summarize the main observations in operation and dedicated experiments, as well as countermeasures including baking, NEG coated warm beam pipes, solenoids, bunch patterns, anti-grazing rings, pre-pumped cold beam pipes, scrubbing, and operation with long bunches. This article is a short version of [1].

Keywords

beam handling equipment; ion accelerators; particle beam bunching; particle beam diagnostics; particle beam dynamics; particle beam stability; solenoids; synchrotrons; NEG coated warm beam pipes; RHIC; antigrazing rings; beam intensity; bunch crossing; bunch patterns; electron cloud effects; incoherent emittance growth; prepumped cold beam pipes; pressure instabilities; solenoids; transition energy; tune shifts; Acceleration; Clouds; Electron beams; Gold; Ion beams; Particle beams; Polarization; Protons; Solenoids; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2007. PAC. IEEE

Conference_Location

Albuquerque, NM

Print_ISBN

978-1-4244-0916-7

Type

conf

DOI

10.1109/PAC.2007.4441092

Filename

4441092