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Author(s):
K. Ida, H. Yamada, H. Iguchi, S. Hidekuma, H. Sanuki, K. Yamazaki and CHS Group
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Title:
Electric Field Profile of CHS Heliotron/Torsatron Plasma with Tangential Neutral Beam Injection
Date of publication:
Oct. 1990
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Key words:
radial electric field, poloidal rotation, CHS Heliotron/Torsatron, tangential neutral beam injection
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Abstract:
The radial electric field profiles derived from poloidal rotation velocity are compared with neoclassical estimates for a plateau regime plasma heated by tangentially injected neutral beam in CHS heliotron/torsatron device. The measured electric field (E_r) is more negative than the neoclassical prediction especially near the plasma periphery. A gradient of radial electric field (partial E_r/partial r) in this region is found to be more negative in the plasma with higher electron density. Although the corresponding poloidal rotation velocity is too small to trigger the L/H transition, these negative E_r and partial E_r/partial r are associated with a reduction of thermal electron conductivity.
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