Title :
Transverse behaviour of the LHC proton beam in the SPS: an update
Author :
Arduini, G. ; Cornelis, K. ; Höfle, W. ; Rumolo, G. ; Zimmermann, F.
Author_Institution :
SL Div., CERN, Geneva, Switzerland
Abstract :
During the 1999 SPS run, strong transverse instabilities were observed with the LHC beam. Both the instability characteristics and the identical threshold current as for beam-induced electron multipacting led to consider the interaction of the beam with the electron cloud as a likely source. In 2000, we have measured the dependence of beam motion, beam loss, and emittance growth on bunch intensity, number of bunches, octupole strength, chromaticity, and gaps in the bunch train. We report on these recent studies and compare the beam observations with simulations of electron cloud build up and electron-induced single-bunch instabilities
Keywords :
colliding beam accelerators; particle beam bunching; particle beam stability; proton accelerators; storage rings; LHC beam; beam loss; beam motion; beam-induced electron multipacting; bunch intensity; bunch train; chromaticity; electron cloud; electron-induced single-bunch instabilities; emittance growth; identical threshold current; instability characteristics; octupole strength; strong transverse instabilities; Clouds; Electron beams; Frequency; Large Hadron Collider; Motion measurement; Particle beams; Performance evaluation; Tail; Threshold current; Wideband;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987215
