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Monte Carlo simulation of neutral transport in the non-axisymmetric region of the GAMMA 10 anchor-cell

Published online by Cambridge University Press:  20 December 2006

Y. NAKASHIMA ,
Y. HIGASHIZONO ,
M. SHOJI ,
S. KOBAYASHI ,
Y. KUBOTA ,
M. YOSHIKAWA ,
T. KOBAYASHI ,
M.K. ISLAM  and
T. CHO
Y. NAKASHIMA
Affiliation:
Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, Japan
Y. HIGASHIZONO
Affiliation:
Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, Japan
M. SHOJI
Affiliation:
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
S. KOBAYASHI
Affiliation:
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Y. KUBOTA
Affiliation:
Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, Japan
M. YOSHIKAWA
Affiliation:
Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, Japan
T. KOBAYASHI
Affiliation:
Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, Japan
M.K. ISLAM
Affiliation:
Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, Japan
T. CHO
Affiliation:
Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, Japan
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Abstract

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A three-dimensional neutral transport model using the DEGAS version 63 Monte Carlo code is described in order to understand the behavior of neutrals in the non-axisymmetric anchor region of the GAMMA 10 tandem mirror. A precise mesh structure with three-dimensional geometry was built up and the simulation was carried out under a plausible assumption of the particle source on the basis of experimental data. In standard ion-cyclotron-range-of-frequency heated plasmas, detailed measurements of Hα line emission were performed using a 5-ch Hα detector array in the outer-transition region of the east anchor cell and the experimental results were compared with the simulation. The spatial profile of Hα emission predicted from the simulation agreed well with the experimental result and the distinctive behavior of neutrals in this region was clarified.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 1123 - 1126
Copyright
2006 Cambridge University Press