INTERPRETATION OF SAWTOOTH-INDUCED CHANGES OF NEUTRON EMISSION IN JOINT EUROPEAN TORUS NEUTRAL BEAM INJECTION EXPERIMENTS

Based on a new theory for redistribution of fast ions during sawtooth crashes, numerical simulations are executed of sawtooth oscillations i n the 2.5-MeV neutron emission from neutral beam injection-heated Join t European Torus (JET) plasmas. The analysis includes all sources of 2 .5-MeV neutrons: thermal, beam-plasma, and beam-beam deuterium-deuteri um reactions. Two models of sawteeth are used in the calculations - bo th based on magnetic field line reconnection. A detailed comparison wi th experimental results from JET shows that the theory for sawtooth-in duced fast ion redistribution is consistent with the observed changes of the neutron emission.