Abstract
The presence of fishbone events in the PDX tokamak is correlated with a reduction in the burnup of 0.8-MeV /sup 3/He ions. This reduction is probably caused by distortion of the /sup 3/He drift orbitals in the helical magnetic fields associated with the instability, resulting in the loss of about 70% of the confined /sup 3/He ions in a moderately strong fishbone. Such a nonresonant loss of particles with large orbits indicates that fishbone events may influence 3.5-MeV alphas in ignition experiments.
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