High electron temperature plasmas with steep temperature gradient in the core are obtained in recent experiments in the Large Helical Device [A. Komori et al, Fusion Sci. Technol. 58, 1 (2010)]. Such plasmas are called core electron-root confinement (CERC) and have attracted much attention. In typical CERC plasmas, the radial electric field shows a transition phenomenon from a small negative value (ion root) to a large positive value (electron root) and the radial electric field in helical plasmas are determined dominantly by the ambipolar condition of neoclassical particle flux. To investigate such plasmas’ neoclassical transport precisely, the numerical neoclassical transport code, FORTEC-3D [S. Satake et al, J. Plasma Fusion Res. 1, 002 (2006)], which solves drift kinetic equation based on Monte Carlo method and has been applied for ion species so far, is extended to treat electron neoclassical transport. To check the validity of our new FORTEC-3D code, benchmark calculations are carried out with GSRAKE [C. D. Beidler et al, Plasma Phys. Controlled Fusion 43, 1131 (2001)] and DCOM/NNW [A. Wakasa et al, Jpn. J. Appl. Phys. 46, 1157 (2007)] codes which calculate neoclassical transport using certain approximations. The benchmark calculation shows a good agreement among FORTEC-3D, GSRAKE and DCOM/NNW codes for a low temperature plasma. It is also confirmed that finite orbit width effect included in FORTEC-3D affects little neoclassical transport even for the low collisionality plasma if the plasma is at the low temperature. However, for a higher temperature (5 keV at the core) plasma, significant difference arises among FORTEC-3D, GSRAKE, and DCOM/NNW. These results show an importance to evaluate electron neoclassical transport by solving the kinetic equation rigorously including effect of finite radial drift for high electron temperature plasmas.
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March 2011
Research Article|
March 22 2011
Neoclassical electron transport calculation by using Monte Carlo method
Seikichi Matsuoka;
Seikichi Matsuoka
a)
1
The Graduate University for Advanced Studies (SOKENDAI)
, Toki 509-5292, Japan
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Shinsuke Satake;
Shinsuke Satake
1
The Graduate University for Advanced Studies (SOKENDAI)
, Toki 509-5292, Japan
2
National Institute for Fusion Science
, Toki 509–5292, Japan
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Masayuki Yokoyama;
Masayuki Yokoyama
1
The Graduate University for Advanced Studies (SOKENDAI)
, Toki 509-5292, Japan
2
National Institute for Fusion Science
, Toki 509–5292, Japan
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Arimitsu Wakasa;
Arimitsu Wakasa
3Department of Nuclear Engineering,
Kyoto University
, Kyoto 606–8501, Japan
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Sadayoshi Murakami
Sadayoshi Murakami
3Department of Nuclear Engineering,
Kyoto University
, Kyoto 606–8501, Japan
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a)
Electronic mail: matsuoka.seikichi@LHD.nifs.ac.jp.
Phys. Plasmas 18, 032511 (2011)
Article history
Received:
November 12 2010
Accepted:
February 01 2011
Citation
Seikichi Matsuoka, Shinsuke Satake, Masayuki Yokoyama, Arimitsu Wakasa, Sadayoshi Murakami; Neoclassical electron transport calculation by using Monte Carlo method. Phys. Plasmas 1 March 2011; 18 (3): 032511. https://doi.org/10.1063/1.3562890
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