DocumentCode
879365
Title
Instability Studies and Double RF-System Operation at BESSY
Author
Weihreter, E. ; Gaupp, A. ; Hoberg, H.G. ; Klotz, W.-D. ; Kuske, P. ; Lehr, H. ; Maier, R. ; Mülhaupt, G.
Author_Institution
Berliner Elektronenspeicherring-Gesellschaft fÿr Synchrotronstrahlung mbH (BESSY) Lentzeallee 100, D-1000 Berlin 33
Volume
32
Issue
5
fYear
1985
Firstpage
2317
Lastpage
2319
Abstract
Longitudinal multi-bunch oscillations are observed at the BESSY storage ring even with beam currents of 1-2 mA, although stored currents up to 970 mA can be achieved. With a double rf-system the threshold currents can be increased when operating the system in the tune splitting or in the `Landau´-cavity mode. A longitudinal impedance of ¿Z/n¿¿12 ¿ is obtained from bunchlength measurements. No transverse multi-bunch instabilities have been observed. This may be explained by Landau damping induced by the non-linear fields of the ions trapped in the beam.
Keywords
Damping; Frequency; Impedance measurement; Nonlinear optics; Particle beam optics; Q measurement; Stimulated emission; Storage rings; Synchrotrons; Threshold current;
fLanguage
English
Journal_Title
Nuclear Science, IEEE Transactions on
Publisher
ieee
ISSN
0018-9499
Type
jour
DOI
10.1109/TNS.1985.4333898
Filename
4333898
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