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Interpretation of Sawtooth-Induced Changes of Neutron Emission in Joint European Torus Neutral Beam Injection Experiments

D. Anderson, Ya. I. Kolesnichenko, M. Lisak, F. Wising, Yu. V. Yakovenko

Fusion Science and Technology

Volume 26 / Number 3P1 / November 1994 / Pages 227-233


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

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