RF linac designs with beams in thermal equilibrium

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.51083· OSTI ID:383697

Reiser, M; Brown, N ^[1]

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1. Institute for Plasma Research, University of Maryland, College Park, Maryland 20742 (United States)

Beams in conventional radio-frequency linear accelerators (rf linacs) usually have a transverse temperature which is much larger than the longitudinal temperature. With high currents, space charge forces couple the transverse and longitudinal particle motions, driving the beam toward thermal equilibrium, which leads to emittance growth and halo formation. A design strategy is proposed in which the beam has equal transverse and longitudinal temperatures through the entire linac, avoiding these undesirable effects. For such equipartitioned linac beams, simple analytical relationships can be derived for the bunch size, tune depression, and other parameters as a function of beam intensity, emittance, and external focusing. These relations were used to develop three conceptual designs for a 938 MeV, 100 mA proton linac with different tune depressions, which are presented in this paper. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 383697
• Report Number(s): CONF-9510361--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 377; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM DYNAMICS
FOCUSING
LINEAR ACCELERATORS
MEV RANGE 100-1000
MILLI AMP BEAM CURRENTS
RF SYSTEMS
SPACE CHARGE
THERMAL EQUILIBRIUM