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Modelling the Neutraliser Plasma of ITER Negative Ion Beams E. Surrey EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, Abstract: Indirect heating of the neutraliser gas by the beam has been shown to be responsible for the reduced neutralisation efficiency observed in positive ion neutral beam systems. The translational gas temperature can be predicted from the density and electron temperature and, in general, a higher gas temperature implies a lower neutralisation target. A simple, one-dimensional model, originally developed for the JET positive ion neutral injection system, has been adapted for ITER relevant negative ion systems. The results imply that gas heating for the ITER heating and diagnostic beams is unlikely to be severe and hence the neutralisation target might be expected to be close to the design value.
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