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A Code that Simulates Fast-Ion Dα and Neutral Particle Measurements

Published online by Cambridge University Press:  20 August 2015

W. W. Heidbrink ,
D. Liu ,
Y. Luo ,
E. Ruskov  and
B. Geiger
W. W. Heidbrink*
Affiliation:
Department of Physics and Astronomy, University of California, Irvine, California, CA 92697, USA
D. Liu*
Affiliation:
Department of Physics and Astronomy, University of California, Irvine, California, CA 92697, USA Department of Physics, University of Wisconsin-Madison, Madison, WI53706, USA
Y. Luo*
Affiliation:
Department of Physics and Astronomy, University of California, Irvine, California, CA 92697, USA Tri Alpha Energy Corporation, 27211 Burbank, Foothill Ranch, CA 92610, USA
E. Ruskov*
Affiliation:
Department of Physics and Astronomy, University of California, Irvine, California, CA 92697, USA
B. Geiger*
Affiliation:
Max-Planck Institute für Plasmaphysik, Garching, Germany
*
Corresponding author.Email:Bill.Heidbrink@uci.edu
Email:dliu29@wisc.edu
Email:yluo@trialphaenergy.com
Email:eruskov@uci.edu
Email:bgeiger@ipp.mpg.de
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Abstract

A code that models signals produced by charge-exchange reactions between fast ions and injected neutral beams in tokamak plasmas is described. With the fast-ion distribution function as input, the code predicts the efflux to a neutral particle analyzer (NPA) diagnostic and the photon radiance of Balmer-alpha light to a fast-ion Dα (FIDA) diagnostic. Reactions with both the primary injected neutrals and with the cloud of secondary “halo” neutrals that surround the beam are treated. Accurate calculation of the fraction of neutrals that occupy excited atomic states (the collisional-radiative transition equations) is an important element of the code. Comparison with TRANSP output and other tests verify the solutions. Judicious selection of grid size and other parameters facilitate efficient solutions. The output of the code has been validated by FIDA measurements on DIII-D but further tests are warranted.

Keywords

52.55.Pi52.65.Pp52.70.KzFast ions
Type
Research Article
Information
Communications in Computational Physics , Volume 10 , Issue 3 , September 2011 , pp. 716 - 741
Copyright
Copyright © Global Science Press Limited 2011

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