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Measurements of charge exchange neutral particles in Heliotron J
masashi Kaneko,F. Sano,H. Okada,K. Hanatani,K. Nagasaki,K. Kondo,S. Kobayashi,S. Murakami,T. Mizuuchi,Y. Suzuki,Y. Nakamura 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The ion behavior in Heliotron J plasmas is investigated through measurements of the ion energy distribution function, which is measured with a charge-exchange neutral particle analyzer system. The bulk ion temperature is estimated from the measured energy spectrum. In NBI heated plasma, the pitch angle distribution of energy spectra is measured. Dependence of the high energy tail and bulk ion temperature of injection power is investigated in an ion-cyclotron range of frequency heating experiment.)
Plasma Breakdown using Second Harmonic EC Waves in Helical Devices
Kazunobu Nagasaki,A. Cappa,A. Fernandez,D. Tafalla,E. de la Cal,F. Tabares,F. Sano,F. Castejon,H. Shidara,H. Okada,K. Kondo,K. Takahashi,S. Kobayashi,T. Mizuuchi,T. Estrada,V. Tribaldos,Y. Yoshimura 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Plasma breakdown using second-harmonic electron cyclotron (EC) waves has been studied experimentally in three helical devices, Heliotron J, TJ-II and CHS. Recent technological progress on electron cyclotron heating (ECH) systems enables us to determine what the important factors for second-harmonic plasma breakdown are. Comparison of the experimental results among three devices shows a common feature that the plasma starts up from the good confinement region and strongly depends on the nonlinear interactions with the electric field of the local beam rather than the multi-reflected field. This suggests that the confinement of high energy electrons generated by ECH has a dominant role in second-harmonic plasma breakdown.