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ryosuke Ikeda,C. Suzuki,G. Matsunaga,K. Toi,M. Takeuchi,S. Okamura 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
For the purpose of transport simulation, low temperature plasmas having similar dimensionless parameters to those of high temperature plasmas are produced by 2.45 GHz microwaves up to and 30 kW at low toroidal field (Bt < 0.1 T) in the Compact Helical System (CHS). In the configuration where the fundamental electron cyclotron resonance layer is placed near the last closed flux surface, electron density exceeds the ordinary (O)-mode cutoff density by a factor of 2 . 3 in hydrogen plasmas. The deposition of microwave power occurs in the interior region beyond the (O)-mode and extraordinary (X)-mode cutoff layers through which electron cyclotron waves (ECW) cannot penetrate. This suggests that a mode conversion of ECW to electron Bernstein wave (B-mode) would occur. Moreover, superimposition of ECW power was performed on target over-dense plasmas which have a steep density gradient at the upper hybrid resonance layer. In this condition, the mode conversion efficiency of superimposed ECW power was theoretically estimated to be about 50 . 60 %. The absorption rate of superimposed ECW power reached up to about 30 %.