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Observation of weak impact of a stochastic magnetic field on fast-ion confinement
G Fiksel1, B Hudson, D J Den Hartog
1Department of Physics, University of Wisconsin--Madison and Center for Magnetic Self Organization in Laboratory and Astrophysical Plasmas, Madison, Wisconsin 53706, USA.
Abstract:
Fast ions are observed to be very well confined in the Madison Symmetric Torus reversed field pinch despite the presence of stochastic magnetic field. The fast-ion energy loss is consistent with the classical slowing down rate, and their confinement time is longer than expected by stochastic estimates. Fast-ion confinement is measured from the decay of d-d neutrons following a short pulse of a 20 keV atomic deuterium beam. Ion confinement agrees with computation of particle trajectories in the stochastic magnetic field, and is understood through consideration of ion guiding center islands.
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