PPPL-3668 is available in <a href="PPPL-3668.pdf">pdf</a> format.

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<b>Neutral Particle Analyzer Measurements of Ion Behavior in NSTX</b>
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<b>Authors:</b> S.S. Medley, R.E. Bell, D.S. Darrow, and A.L. Roquemore 
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<b>Date of PPPL Report:</b> February 2002
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<b>Presented at:</b> the Seventh IAEA Technical Committee Meeting on Energetic Particles in Magnetic Confinement Systems, 8 -11 October 2001, in Gothenburg, Sweden. </p>


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Initial results obtained with the Neutral Particle Analyzer (NPA) diagnostic on the National Spherical Torus Experiment (NSTX) are presented. Magnetohydrodynamic activity and reconnection events cause depletion of the deuterium energetic ion distribution created by neutral-beam injection. Adding High Harmonic Fast Wave Heating to neutral-beam-heated discharges results in the generation of an energetic ion tail above the beam injection energy. NPA measurements of the residual hydrogen ion temperature are in good agreement with those from recombination spectroscopy.

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