Title :
New diagnostics and cures for coupled-bunch instabilities
Author :
Prabhakar, Sanjay ; Fox, J.D. ; Teytelman, D.
Author_Institution :
Dept. of Math., Stanford Univ., CA, USA
Abstract :
As circular accelerators move towards larger numbers of bunches and higher beam currents, the task of diagnosing and curing coupled-bunch instabilities becomes ever harder. This paper describes the use of phase space tracking, i.e. reconstruction of bunch phase space trajectories, as a comprehensive instability diagnostic. A new instability cure is also presented, based on recent insights into the dynamics of unevenly-filled rings. Data is shown from PEP-II and the ALS, where "optimally shaped" uneven fills have yielded significant increases in instability thresholds
Keywords :
X-ray production; electron accelerators; electron beams; high energy physics instrumentation computing; particle beam bunching; particle beam diagnostics; particle beam stability; storage rings; ALS; PEP-II; bunch phase space trajectories; circular accelerators; coupled-bunch instabilities; dynamics; high beam currents; instability diagnostic; instability thresholds; particle beam diagnostics; phase space tracking; unevenly-filled rings; Colliding beam devices; Damping; Extraterrestrial measurements; Image reconstruction; Linear accelerators; Mathematics; Optical coupling; Phase measurement; Radio frequency; Storage rings;
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.2001.987499
