CERN Accelerating science

Article
Report number	SLAC-PUB-11231
Title	Single-Bunch Tune and Beam Size Measurements Along Bunch Trains in PEP-II
Author(s)	Holtzapple, Robert ; Dujmic, Denis ; Fisher, Alan S
Affiliation	(Alfred University, Alfred, New York) ; (SLAC)
Publication	2005
Imprint	May 2005
Number of pages	4
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2006
Abstract	By scanning a gated camera and a gated tune monitor across the bunch pattern during normal colliding-bunch operation of PEP-II, the single-bunch tunes and beam sizes were measured simultaneously in the high and low energy storage rings of PEP-II. The measurements were made with 1561 colliding bunches in PEP-II, arranged in trains of 66 bunches, with each bunch in the train separated by 4.2 ns. The tune and beam size measurements were correlated with the current, luminosity, and specific luminosity of the bunch. The results show a vertical tune shift at the start and end of the mini-trains, a luminosity droop along the mini-train, and specific luminosity drop in the first and last bunches of the train, since they experience a different parasitic crossing on either side of the IP.

Corresponding record in: Inspire