PPPL-3565 is available in <a href="PPPL-3565.pdf">pdf</a> or 
<a href="PPPL-3565.ps">postscript</a> formats.

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<b>Investigation of Ion Absorption of the High Harmonic Fast Wave in NSTX using HPRT</b>
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<b>Authors:</b> A. Rosenberg, J.E. Menard, and B.P. LeBlanc


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<b>Date of PPPL Report:</b> May 2001
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<b>Presented at:</b> the 14th Topical Conference on Applications of Radio Frequency Powers in Plasmas in Oxnard, CA, May 7-9, 2001. Proceedings to be published by the American Institute of Physics (AIP). </p>


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Understanding high harmonic fast wave (HHFW) power absorption by ions in a spherical torus (ST) is of critical importance to assessing the wave's viability as a means of heating and especially driving current. In this work, HPRT is used to calculate absorption for He and D, with and without minority H in National Spherical Torus Experiment (NSTX) plasmas using experimental EFIT equilibria and kinetic profiles. HPRT is a 2-D ray-tracing code which uses the full hot plasma dielectric to compute the perpendicular wave number along the hot electron/cold ion plasma ray path. Ion and electron absorption dependence on antenna phasing, ion temperature, <FONT FACE = "symbol">b</FONT FACE = "symbol"><sub>t</sub>, and minority temperature and concentration is analyzed. These results form the basis for comparisons with other codes, such as CURRAY, METS, TORIC, and AORSA.


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