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[en] In the local Electron Cyclotron Heating (ECH) experiments, high electron temperature plasmas have been obtained in Compact Helical System (CHS), and recently in the Large Helical Device (LHD). The internal transport barrier (ITB) with strong positive radial electric field has been experimentally observed in CHS, which reduces neo-classical ripple transport and anomalous transport losses. The same physics pictures are expected in LHD high temperature plasmas. Several ion temperature profiles are assumed for analyzing LHD experimental data, and it is found that the experimentally obtained electron thermal transport coefficients seem to roughly agree with neoclassical ripple transport outside the ITB region. However, around ITB region, about ten times higher than the neoclassical coefficients with strong ambipolar electric field prediction are obtained. The anomalous transport losses might be dominant and be reduced by this strong electric field shear around the ITB region. (author)
Source
Nishimura, K.; Inagaki, S.; Sanuki, H.; Yamazaki, K. (National Inst. for Fusion Science, Toki, Gifu (Japan)) (eds.); 650 p; ISBN 4-9900586-7-4; 
; 2003; p. 611-615; ITC-12: 12. international Toki conference on plasma physics and controlled nuclear fusion; Toki, Gifu (Japan); 11-14 Dec 2001; APFA'01: 3. general scientific assembly of Asia plasma and fusion association; Toki, Gifu (Japan); 11-14 Dec 2001; 5 refs., 3 figs.
; 2003; p. 611-615; ITC-12: 12. international Toki conference on plasma physics and controlled nuclear fusion; Toki, Gifu (Japan); 11-14 Dec 2001; APFA'01: 3. general scientific assembly of Asia plasma and fusion association; Toki, Gifu (Japan); 11-14 Dec 2001; 5 refs., 3 figs.