Beam-halo measurements in high-current proton beams

We present results from an experimental study of the beam halo in a high-current 6.7-MeV proton beam propagating through a 52-quadrupole periodic-focusing channel. The gradients of the first four quadrupoles were independently adjusted to match or mismatch the injected beam. Emittances and beamwidth...

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Bibliographic Details
Published in:Physical review letters 2002-11, Vol.89 (21), p.214802-214802
Main Authors: Allen, C K, Chan, K C D, Colestock, P L, Crandall, K R, Garnett, R W, Gilpatrick, J D, Lysenko, W, Qiang, J, Schneider, J D, Schulze, M E, Sheffield, R L, Smith, H V, Wangler, T P
Format: Article
Language:English
Subjects:
FREE ENERGY
NUCLEAR PHYSICS AND RADIATION PHYSICS
PARTICLE-CORE COUPLING MODEL
PROTON BEAMS
QUADRUPOLES
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Summary:We present results from an experimental study of the beam halo in a high-current 6.7-MeV proton beam propagating through a 52-quadrupole periodic-focusing channel. The gradients of the first four quadrupoles were independently adjusted to match or mismatch the injected beam. Emittances and beamwidths were obtained from measured profiles for comparisons with maximum emittance-growth predictions of a free-energy model and maximum halo-amplitude predictions of a particle-core model. The experimental results support both models and the present theoretical picture of halo formation.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.89.214802