英国物理学会
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作者:S.-I. Itoh , K. Itoh
来源:[J].Nuclear Fusion(IF 2.734), 2009, Vol.49 (5), pp.055016 (11pp)IOP
摘要:We present numerical simulation studies of 2D reduced MHD equations investigating the impact of the electronic β parameter and of curvature effects on the nonlinear evolution of drift tearing islands. We observe a bifurcation phenomenon that leads to an amplification of the ...
作者:... M. Yagi , S.-I. Itoh , K. Itoh
来源:[J].Nuclear Fusion(IF 2.734), 2009, Vol.49 (7), pp.075023 (9pp)IOP
摘要:The mechanism of internal transport barrier (ITB) collapse in the reversed magnetic shear configuration is investigated using a global ion temperature gradient (ITG) driven drift wave turbulence code. A heating source and a toroidal momentum source are introduced to follow the se...
作者:... K. Itoh , S.-I. Itoh , S. Benkadda
来源:[J].Nuclear Fusion(IF 2.734), 2010, Vol.50 (5), pp.054007 (12pp)IOP
摘要:The drift-tearing mode is nonlinearly simulated, using a reduced set of two-fluid equations and locking of magnetic island rotation by a static error field is investigated. Detailed analysis shows that Maxwell stress and ion viscosity play important roles in the locking proc...
作者:... K. Itoh , S.-I. Itoh , LHD Experimental Group
来源:[J].Nuclear Fusion(IF 2.734), 2010, Vol.50 (6), pp.064012 (5pp)IOP
摘要:The electron internal transport barrier (ITB) is formed by an edge perturbation induced by a tracer encapsulated solid pellet injection in a net-current free LHD plasma. The ITB trigger by an edge perturbation takes place in the low density regime and the ITB is not accompanied b...
作者:S.-I. Itoh , T. Kobayashi ...
来源:[J].Nuclear Fusion(IF 2.734), 2013, Vol.53 (11)IOP
摘要:We report observations of the dynamic response of micro-fluctuations and turbulent flux to a low-frequency heating power modulation in the Large Helical Device. The responses of heat flux and micro-fluctuation intensity differ from that of the change in temperature gradient. This...
作者:S.-I. Itoh , Y. Miura ...
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (7)IOP
摘要:In the JFT-2M tokamak (JFT standing for JAERI Fusion Torus), the limit cycle oscillation (LCO), together with several variables, i.e., the electrostatic potential, radial electric field, electron density, turbulence intensity, and D α emission from the divertor ...
作者:... K. Itoh , M. Yagi , S.-I. Itoh
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (11)IOP
摘要:Nonlinear competition of turbulent structures and their roles in transport are investigated by using three-dimensional simulation code of resistive drift wave turbulence in magnetized cylindrical plasmas. Selective formation of zonal flows and streamers has been obtained by contr...
作者:... A. Fujisawa , S.-I. Itoh , K. Itoh
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (11)IOP
摘要:Meso-scale streamer has a radially elongated structure and is believed to enhance the radial transport. In order to study the control of the streamer, we demonstrated an end plate biasing to the streamer state in the PANTA linear plasma. During the end plate biasing, the electron...
作者:S.-I. Itoh , K. Itoh ...
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (11)IOP
摘要:Non-linear coupling between fluctuations at different radial locations is observed on the Large Helical Device (LHD) plasma. The summed bi-coherence between the low frequency macro-scale fluctuation (frequency is f = 2.75 kHz) at ρ = r eff/ a 99 = 0.63 ...
作者:S.-I. Itoh , Y. Miura ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (6)IOP
摘要:This article presents a radial electric field measurement by a heavy ion beam probe in the JFT-2M tokamak, during the L-H transition. An abrupt increase (time scale of O(100 µ s)) of the strong edge radial electric field (localized in the radius with FWHM ∼7 mm) results in t...

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