Electron cloud generation and trapping in a quadrupole magnet at the Los Alamos PSR

Author

Macek, R.J. ; Browman, A.A. ; Ledford, J.E. ; Borden, M.J. ; O´Hara, J.F. ; McCrady, R.C. ; Rybarcyk, L.J. ; Spickermann, T. ; Zaugg, T.J. ; Pivi, M.T.F.

Author_Institution

TechSource Inc., Santa Fe

fYear

2007

fDate

25-29 June 2007

Firstpage

828

Lastpage

830

Abstract

A diagnostic to measure electron cloud formation and trapping in a quadrupole magnet has been developed, installed, and successfully tested at PSR. Beam studies with this diagnostic show that the electron flux striking the wall in the quadrupole is comparable to or larger than in an adjacent drift. In addition, the trapped electron signal, obtained using the sweeping feature of diagnostic, was larger than expected and decayed very slowly with an exponential time constant of 50 to 100 mus. Experimental results were also obtained which suggest that a significant fraction of the electrons observed in the adjacent drift space were seeded by electrons ejected from the quadrupole.

Keywords

accelerator magnets; electron traps; particle beam diagnostics; proton accelerators; storage rings; Los Alamos PSR; drift space; electron cloud diagnostics; electron flux; proton storage ring; quadrupole magnet; trapped electron signal; Clouds; Electrodes; Electron beams; Electron traps; Laboratories; Magnetic flux; Particle beams; Protons; Pulse measurements; Structural beams;

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.2007.4440754

Filename

4440754