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Author(s):
S. Murakami, N. Nakajima, U. Gasparino and M. Okamoto
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Title:
Simulation Study of Radial Electric Field in CHS and LHD
Date of publication:
Jan. 1997
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Key words:
energetic particle, radial electric field, NBI, ICR heating, ECR heating, Compact Helical System, Large Helical Device
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Abstract:
The influence of energetic particles generated by various plasma heating methods on the radial electric field is studied numerically in CHS and LHD. The important role played by the radial flux of beam particles during tangentially injected NBI is pointed out in CHS and the strong negative radial electric field experimentally observed near the plasma periphery is reproduced. A strong negative radial electric field, expected to reduce anomalous transport, is found near the plasma periphery in LHD due to the flux of energetic ion generated by ICR heating. On the contrary, a positive radial electric field is obtained by taking into account the energetic electron flux driven by ECR heating in CHS. This can explain the radial electric field transition phenomena observed experimentally.
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