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Modelling of fast ion redistribution due to sawteeth in neutral beam heated plasmas

An approximate semi-analytical approach is presented which uses line-of-sight measurements of D-D fusion neutrons from beam heated Tokamak plasmas to infer the behaviour of the fast ion population at sawtooth collapses. Application to recent results on JET confirms that a large fraction of the central fast beam ions are expelled from the central plasma. The approach provides an approximate but computationally fast and convenient complement to presently used inversion techniques.