CERN Accelerating science

Article
Report number	CERN-SL-2001-062-AP
Title	Study of coherent tune shift caused by electron cloud in positron storage rings
Author(s)	Ohmi, K ; Heifets, S ; Zimmermann, Frank
Affiliation	(CERN) ; (SLAC)
Corporate Author(s)	CERN. Geneva. SL (SPS+LHC) Division
Publication	2001
Imprint	8 Oct 2001
Number of pages	4
Series	(Report)
In:	2nd Asian Particle Accelerator Conference, Beijing, China, 17 - 21 Sep 2001, pp.WEP056
Subject category	Accelerators and Storage Rings
Abstract	We discuss the transverse betatron tune shift of the coherent dipole motion of a beam interacting with an electron cloud. A positron beam which passes through a frozen charge distribution experiences an electric field, which shifts its tune in the positive direction. The electrons in the actual cloud are not frozen, but move during the bunch passage. Thus, the electron distribution varies due to the interaction with the beam and it is "soft". We study the dipole tune shift of the beam interacting with such a "soft" charge distribution.
Copyright/License	publication: (License: CC-BY)

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