CERN Accelerating science

Article
Title	Recent Experiment Results on Fast Ion Instability at 2.5 GeV PLS
Author(s)	Kim Eun San ; Han, Yeung-Jin ; Hukuma, Hitoshi ; Ikeda, Hitomi ; Park, Chong-Do ; Park, Sung-Ju ; Soo Ko In ; Yun Huang Jung
Affiliation	(KEK, Ibaraki) ; (PAL, Pohang)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.466
Subject category	Accelerators and Storage Rings
Abstract	We present recent experiment results on the fast ion instability that were performed at the PLS storage ring. With higher vacuum pressures of three orders of magnitude than nominal one by He gas injection into the ring, increases of a factor of around three in the vertical beam size were observed by interferometer system. From the various measurement results, we estimated growth times for the instability as a funcion of vacuum pressure and beam current. We also compared the results with those of the computer simulations and analytical calculations.