英国物理学会
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作者:T. Tokuzawa , Y. Takemura ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (7)IOP
摘要:We report the first observation of the formation of a magnetic island before the occurrence of mode locking in helical plasma. New analysis and observation techniques applied to the ECE signal and poloidal flow in LHD experiments yield the following results. (i) A magnetic island...
作者:T. Tokuzawa , I. Yamada ...
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (3)IOP
摘要:In the Large Helical Device (LHD), H-mode plasmas are produced, having large amplitude edge-localized modes (ELMs) which are induced by resistive interchange modes (RICs) at the ι /2 π = 1 rational surface near the foot of the edge transport barrier (ETB). These large ELMs e...
作者:T. Tokuzawa , T. Kobayashi ...
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:T. Tokuzawa , I. Yamada ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (8)IOP
摘要:Effects of low- n magnetohydrodynamic instabilities on plasma performance have been assessed in the regime where an achieved beta value is limited by instabilities. The unstable regime of an ideal interchange mode is characterized by enhanced magnetic hill and reduced magnetic sh...
作者:T. Tokuzawa , K.Y. Watanabe ...
来源:[J].Journal of Instrumentation(IF 1.869), 2016, Vol.11 (02)IOP
摘要:We have upgraded the multi-channel microwave reflectometer system which uses a frequency comb as a source and measure the distribution of the density fluctuation caused by magneto-hydro dynamics instability. The previous multi-channel system was composed of the Ka-band, and the U...
作者:... A. Mase , K. Takehara , T. Tokuzawa
来源:[J].Journal of Instrumentation(IF 1.869), 2016, Vol.11 (01)IOP
摘要:Turbulence measurement is important in the study of plasma confinement. We developed a multi-channel correlation electron cyclotron emission (cECE) radiometer system, using an existing conventional ECE radiometer system (RADH) on a large helical device (LHD) . The signal received...
作者:T. Tokuzawa , T. Morisaki ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (6)IOP
摘要:In the large helical device, plasma with more than 4% average beta was successfully produced by multi-pellet injections in a regime with a collisionality one order of magnitude lower than that in previous high-beta operations. An improvement in particle confinement was observed d...
作者:T. Tokuzawa , S. Kubo ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (10)IOP
摘要:This article assesses current understanding of hysteresis in transport relations, and its impact on the field. The rapid changes of fluxes compared to slow changes of plasma parameters are overviewed for both core and edge plasmas. The modulation ECH experiment is explained,...
作者:T. Tokuzawa , M. Yoshinuma ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (11)IOP
摘要:Surveys of the ion and electron heat transports of neutral beam (NB) heating plasma were carried out by power balance analysis in He and H rich plasma at LHD. Collisionality was scanned by changing density and heating power. The characteristics of the transport vary dependin...
作者:T. Tokuzawa , T.I. Tsujimura ...
来源:[J].Nuclear Fusion(IF 2.734), 2018, Vol.58 (10)IOP
摘要:The dependence of the energy confinement and energy transport on the isotope mass is a long-standing open question in the stellarator community. With the recent upgrade of the Large Helical Device to allow for deuterium plasma operation, systematic isotope experiments could ...

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