PPPL-3593 is available in pdf or postscript formats.
Neutral Beam Ion Confinement in NSTX
Authors: D.S. Darrow, E.D. Fredrickson, S.M. Kaye, S.S. Medley, and A.L. Roquemore
Date of PPPL Report: July 2001
Presented at: the 28th EPS Conference on Controlled Fusion and Plasma Physics, Madeira, Portugal, June 18-22, 2001.
Neutral beam (NB) heating in the National Spherical Torus Experiment (NSTX) began in September 2000 using up to 5 MW of 80 keV D beams. An initial assessment of beam ion confinement has been made using neutron detectors, a neutral particle analyzer (NPA), and a Faraday cup beam ion loss probe. Preliminary neutron results indicate that confinement may be roughly classical in quiescent discharges, but the probe measurements do not match a classical loss model. MHD activity, especially reconnection events (REs) causes substantial disturbance of the beam ion population.