Development of hollow electron beams for proton and ion collimation

Stancari, G.; Kuznetsov, G.; Shiltsev, V.; Vorobiev, L.G.; Kabantsev, A.; Still, D.A.; Assmann, R.; Drozhdin, A.I.; Valishev, A.

Article
Report number	arXiv:1202.0252 ; IPAC-2010-TUPEB076 ; FERMILAB-CONF-10-182-AD-APC
Title	Development of hollow electron beams for proton and ion collimation
Author(s)	Stancari, G. (Fermilab) ; Drozhdin, A.I. (Fermilab) ; Kuznetsov, G. (Fermilab) ; Shiltsev, V. (Fermilab) ; Still, D.A. (Fermilab) ; Valishev, A. (Fermilab) ; Vorobiev, L.G. (Fermilab) ; Assmann, R. (CERN) ; Kabantsev, A. (UC, San Diego)
Publication	2012
Imprint	Jun 2010
Number of pages	3
Note	3 pp. 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010: Kyoto, Japan
In:	Conf. Proc. C 100523 (2010) pp.TUPEB076
In:	1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB076
Subject category	Accelerators and Storage Rings
Abstract	Magnetically confined hollow electron beams for controlled halo removal in high-energy colliders such as the Tevatron or the LHC may extend traditional collimation systems beyond the intensity limits imposed by tolerable material damage. They may also improve collimation performance by suppressing loss spikes due to beam jitter and by increasing capture efficiency. A hollow electron gun was designed and built. Its performance and stability were measured at the Fermilab test stand. The gun will be installed in one of the existing Tevatron electron lenses for preliminary tests of the hollow-beam collimator concept, addressing critical issues such as alignment and instabilities of the overlapping proton and electron beams.