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Simulational study on losses of neutral beam-injected energetic ions via collisional ripple transport in the low aspect ratio helical system CHS

Published online by Cambridge University Press:  20 December 2006

M. ISOBE ,
D. A. SPONG ,
A. SHIMIZU ,
K. TOI ,
H. MATSUSHITA ,
K. NAGAOKA ,
M. NISHIURA ,
K. MATSUOKA ,
S. OKAMURA  and
S. MURAKAMI
M. ISOBE
Affiliation:
National Institute for Fusion Science, Toki 509-5292, Japan
D. A. SPONG
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6169, USA
A. SHIMIZU
Affiliation:
National Institute for Fusion Science, Toki 509-5292, Japan
K. TOI
Affiliation:
National Institute for Fusion Science, Toki 509-5292, Japan
H. MATSUSHITA
Affiliation:
The Graduate University for Advanced Studies, Toki 509-5292, Japan
K. NAGAOKA
Affiliation:
National Institute for Fusion Science, Toki 509-5292, Japan
M. NISHIURA
Affiliation:
National Institute for Fusion Science, Toki 509-5292, Japan
K. MATSUOKA
Affiliation:
National Institute for Fusion Science, Toki 509-5292, Japan
S. OKAMURA
Affiliation:
National Institute for Fusion Science, Toki 509-5292, Japan
S. MURAKAMI
Affiliation:
Kyoto University, Kyoto 606-8501, Japan
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Abstract

Confinement and loss properties of tangentially co-injected beam ions have been studied for a standard configuration of the Compact Helical System (Rax/Bt=0.921 m/1.9 T) by use of the global particle simulation code DELTA5D. Both ripple transport and collisions with a background plasma are taken into account. It has appeared that partially thermalized, pitch-angle scattered beam ions are dominantly lost at the small major radius side. It has also been shown that the negative potential can enhance beam ions losses.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 1189 - 1192
Copyright
2006 Cambridge University Press

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