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Author Pabst, M. ♦ Bongardt, K. ♦ Letchford, A. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PARTICLE ACCELERATORS ♦ NEUTRON SOURCES ♦ DESIGN ♦ BEAM DYNAMICS ♦ LINEAR ACCELERATORS ♦ CYCLIC ACCELERATORS ♦ SPALLATION ♦ GEV RANGE 01-10 ♦ MILLI AMP BEAM CURRENTS ♦ BEAM EMITTANCE ♦ HYDROGEN 1 MINUS BEAMS
Abstract The accelerator part of proposed neutron spallation sources consists of a high intensity linac and compressor ring or rapid cycling synchrotron. The most critical part of such a high current machine is to keep activation caused by particle loss along the linac or at ring injection down to an acceptable limit. Sources of particle loss along the linac can be beam mismatch, resonances of any kind, temperature transfer within a bunch and/or nonlinear internal or external forces. In addition machine errors like misalignments, tolerances, and rf errors have to be considered. All these sources cause emittance growth. The common way of setting up the beam dynamics of high intensity linacs is governed by avoiding these sources and testing it by Monte-Carlo simulations. To get information on the possible loss mechanism, the only way is to increase the particle number of the Monte-Carlo simulations and to study phase space distributions in detail. Monte-Carlo simulations with 50000 particles for the 1.334 GeV coupled cavity linac of the European Spallation Source (ESS) are presented. It is shown that it is possible to design a non-space charge dominated linac for 200 mA bunch current with almost constant emittances. A detailed study of the phase space distribution along the linac shows a small number of halo particles nearby the bunch core. This halo is acceptable for ring injection. Some information related to particle loss in the linac and in the compressor ring afterwards is extracted and comments for positioning scrapers are made. {copyright} {ital 1996 American Institute of Physics.}
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Place United States
Volume Number 377
Issue Number 1
Technical Publication No. CONF-9510361-


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