Beam-halo measurements in high-current proton beams

Journal Article · Fri Jan 11 00:00:00 EST 2002 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.89.214802· OSTI ID:821459

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

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.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 821459
• Report Number(s): LBNL-54604; PRLTAO; R&D Project: 453401; TRN: US0400801
• Journal Information: Physical Review Letters, Vol. 8921, Issue 21; Other Information: Journal Publication Date: 11/18/2002; PBD: 11 Jan 2002; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
FREE ENERGY
PARTICLE-CORE COUPLING MODEL
PROTON BEAMS
QUADRUPOLES