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Fujisawa, Akihide*; Ido, Takeshi*; Shimizu, Akihiro*; Okamura, Shoichi*; Matsuoka, Keisuke*; Iguchi, Harukazu*; Hamada, Yasuji*; Nakano, Haruhisa*; Oshima, Shinsuke*; Ito, Kimitaka*; et al.
Nuclear Fusion, 47(10), p.S718 - S726, 2007/10
Times Cited Count：101 Percentile：95.26(Physics, Fluids & Plasmas)Present status of experiments on zonal flows is overviewed. Innovative use of modern diagnostics has revealed the existence of zonal flows, their spatio-temporal characteristics, their relationship with turbulence, and their effects on confinement. Particularly a number of observations have been accumulated on the oscillatory branch of the zonal flow, dubbed as geodesic acoustic modes suggesting necessity of theories to give their proper description. Several new methods have elucidated the zonal flow generation processes from the turbulence. Further investigation of relationship between the zonal flows and confinement is strongly encouraged as cross-device activity.
Shinohara, Koji; Isobe, Mitsutaka*; Darrow, D. S.*; Shimizu, Akihiro*; Nagaoka, Kenichi*; Okamura, Shoichi*
Plasma and Fusion Research (Internet), 2, p.042_1 - 042_8, 2007/09
Fujisawa, Akihide*; Ido, Takeshi*; Shimizu, Akihiro*; Okamura, Shoichi*; Matsuoka, Keisuke*; Hamada, Yasuji*; Hoshino, Katsumichi; Nagashima, Yoshihiko*; Shinohara, Koji; Nakano, Haruhisa*; et al.
Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 12 Pages, 2007/03
Present status of experiments on zonal flows is overviewed. Innovative use of traditional and modern diagnostics has revealed unambiguously the existense of the zonal flows, their spatio-temporal caracteristics, their relationship with turbulence, and their effects on confinement. Particularly, a number of observations have been accumulated on the oscillatory branch of zonal flows, dubbed geodesic acoustic modes, suggesting necessity of theories to give their proper description. Furthur investigation of relationship between zonal flows and confinement is strongly encouraged as cross-device activity.
Isobe, Mitsutaka*; Toi, Kazuo*; Matsushita, Hiroyuki*; Goto, Kazuyuki*; Suzuki, Chihiro*; Nagaoka, Kenichi*; Nakajima, Noriyoshi*; Yamamoto, Satoshi*; Murakami, Sadayoshi*; Shimizu, Akihiro*; et al.
Nuclear Fusion, 46(10), p.S918 - S925, 2006/10
Times Cited Count：30 Percentile：69.47(Physics, Fluids & Plasmas)no abstracts in English
Nagaoka, Kenichi*; Isobe, Mitsutaka*; Shinohara, Koji; Osakabe, Masaki*; Shimizu, Akihiro*; Okamura, Shoichi*
Plasma and Fusion Research (Internet), 1(1), p.005_1 - 005_2, 2006/01
A directional Langmuir probe (DLP) method has been applied for energetic particles (ions) measurement in a magnetically confined plasma. Two experimental demonstrations have been performed in the compact helical system (CHS). One is neutral beam modulation experiment and the other is the measurement of energetic ion loss induced by MHD bursts. The results of the DLP are consistent with that of a neutral particle analyzer (NPA) and a lost ion probe (LIP). These experiments show that this method is applicable outside and also inside of the last closed flux surface.
n eigenmode spectroscopy by application of external magnetic-field perturbations in the compact helical systemMatsunaga, Go; Toi, Kazuo*; Suzuki, Chihiro*; Shimizu, Akihiro*; Takechi, Manabu; Nakajima, Noriyoshi*; Fukuyama, Atsushi*
no journal, ,
no abstracts in English
Shinohara, Koji; Isobe, Mitsutaka*; Darrow, D. S.*; Shimizu, Akihiro*; Nagaoka, Kenichi*; Okamura, Shoichi*
no journal, ,
no abstracts in English
