PPPL-3593 is available in <a href="PPPL-3593.pdf">pdf</a> or 
<a href="PPPL-3593.ps">postscript</a> formats.

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<b>Neutral Beam Ion Confinement in NSTX</b>
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<b>Authors:</b> D.S. Darrow, E.D. Fredrickson, S.M. Kaye, S.S. Medley, and A.L. Roquemore
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<b>Date of PPPL Report:</b> July 2001
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<b>Presented at:</b> the 28th EPS Conference on Controlled Fusion and Plasma Physics, Madeira, Portugal, June 18-22, 2001.</p>


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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.




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