The electron cloud instability of the LHC beam in the CERN SPS

Author

Arduini, G. ; Cornelis, K. ; Hofle, W. ; Rumolo, G. ; Zimmermann, E.

Author_Institution

CERN, Geneva, Switzerland

Volume

5

fYear

2003

fDate

12-16 May 2003

Firstpage

3038

Abstract

The electron cloud induced by the LHC beam in the SPS occurs mainly in the dipoles and it is responsible for strong transverse instabilities. In the horizontal plane a coupled bunch mode instability develops in a few tens of turns at injection. Tune shift measurements, mode number and phase space analyses have been performed at different energies and provide information about the electron cloud distribution and its dynamics. In the vertical plane a single bunch head-tail like instability occurs. The equivalent ´electron-cloud wake field´ is inferred from the analysis of the head-tail motion of the bunches of the LHC beam train.

Keywords

beam handling techniques; particle beam dynamics; particle beam stability; proton accelerators; storage rings; synchrotrons; CERN SPS; LHC beam; coupled bunch mode instability; dipoles; electron cloud distribution; electron cloud instability; electron-cloud wakefield; mode number; phase space analyses; single bunch head-tail like instability; strong transverse instabilities; tune shift measurements; Clouds; Electron beams; Energy measurement; Extraterrestrial measurements; Information analysis; Large Hadron Collider; Motion analysis; Performance analysis; Performance evaluation; Phase measurement;

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.2003.1289806

Filename

1289806