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Saigusa, Mikio*; Kanazawa, Sadayoshi*; Ogawa, Toshihide; Kawashima, Hisato; Kikuchi, Kazuo; Ido, Takeshi*; Fukuyama, Atsushi*
Nuclear Fusion, 42(4), p.412 - 417, 2002/04
Times Cited Count:2 Percentile:6.81(Physics, Fluids & Plasmas)A new diagnostic method is proposed for direct measurements of electromagnetic field patterns of fast waves in toroidal plasmas. The fluctuation of ponderomotive potential at a beat wave frequency between the two frequency fast waves produces the actual potential fluctuation via electron and ion motions. A heavy ion beam probe (HIBP) detected the potential fluctuation patterns at a beat wave frequency during the fast wave pulse. The amplitude of potential fluctuations decreases with increasing an electron temperature in fast wave current drive (FWCD) experiments of JFT-2M, due to the improvement of wave absorption via electron Landau damping. The measured potential fluctuation does not contradict with the prediction using a full wave code calculations.