Observation of subcritical geodesic acoustic mode excitation in the large helical device
作者: T. IdoK. ItohM. LesurM. OsakabeA. ShimizuK. OgawaM. NishiuraI. YamadaR. YasuharaY. KosugaM. SasakiK. IdaS. InagakiS.-I. Itohthe LHD Experiment Group
作者单位: 1National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
2Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
3Institut Jean Lamour, UMR 7198 CNRS—Université de Lorraine, Campus Sciences, Bd des Aiguillettes, BP 70239, 54 506 VANDOEUVRE-LES-NANCY Cedex, France
4SOKENDAI (Graduate University for Advanced Study), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
5Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanohara, Kashiwa, Chiba 277-8561, Japan
刊名: Nuclear Fusion, 2017, Vol.57 (7)
来源数据库: Institute of Physics Journal
DOI: 10.1088/1741-4326/aa665a
原始语种摘要: The abrupt and strong excitation of the geodesic acoustic mode (GAM) has been found in the large helical device (LHD), when the frequency of a chirping energetic particle-driven GAM (EGAM) approaches twice that of the GAM frequency. The temporal evolution of the phase relation between the abrupt GAM and the chirping EGAM is common in all events. The result indicates a coupling between the GAM and the EGAM. In addition, the nonlinear evolution of the growth rate of the GAM is observed, and there is a threshold in the amplitude of the GAM for the appearance of nonlinear behavior. A threshold in the amplitude of the EGAM for the abrupt excitation of the GAM is also observed. According to one theory (Lesur et al 2016 Phys. Rev. Lett . 116 015003, Itoh et al 2016 Plasma Phys. Rep . 42 418) the...
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关键词翻译
关键词翻译
  • geodesic 测地的
  • subcritical 次临界的
  • excitation 激发
  • threshold 阈值
  • large 大的
  • device 装置
  • correspond 对应
  • helical 螺旋状的
  • amplitude 振幅
  • abrupt 突然的