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| 1 | MHD Instabilities and Their Effects on Plasma Confinement in Large Helical Device Plasmas with Intense Neutral Beam Injection显示文摘MHD stability of the Large Helical Device (LHD) plasmas produced with intense neutral beam injection is experimentally studied. When the steep pressure gradient near the edge is produced through L-H transition or linear density ramp experiment, interchange-like MHD modes whose rational surface is located very close to the last closed flux surface are strongly excited in a certain discharge condition and affect the plasma transport appreciably. In NBI-heated plasmas produced at low toroidal field, various Alfvén eigenmodes are often excited. Bursting toroidal Alfvén egenmodes excited by the presence of energetic ions induce appreciable amount of energetic ion loss, but also trigger the formation of internal and edge transport barriers. | K.Toi S.Ohdachi S.Yamamoto S.Sakakibara K.Y.Watanabe N.Nakajima X.Ding J.Li S.Morita K.Narihara K.Tanaka T.Tokuzawa H.Yamada Q.Yang | 2004 | Plasma Science and Technology2004，6，3： | 3 |
| 2 | HT-7诊断中性束电源控制系统设计显示文摘本文介绍了HT-7托卡马克实验装置上研制的基于脉宽调制(PWM)的诊断中性束电源系统的组成、结构和控制需求,以及控制系统的组成和控制功能等。经实际调试与多轮HT-7实验运行,验证了该套电源控制系统的稳定性与可靠性。 | 张健 韦维 郝旭 黄懿赟 | 2013 | 原子能科学技术2013，47，12： | 0 |
| 3 | Formation of Edge Transport Barriers by L-H Transition and Large Reversed Plasma Current on LHD显示文摘On the Large Helical Device(LHD)where nested magnetic surfaces are surroundedby the ergodic field layer,edge transport barrier(ETB)was produced in neutral-beam-injection(NBI)heated plasmas through transition and non-transition processes.The former case is the ETBformation by L-H transition,where characteristics of L-H transition observed in a tokamak plasmaare clearly recognized.The confinement improvement is the modest(~10%),compared with theISS95 international stellarator scaling.The threshold power for the transition is comparable orslightly lower than the ITER scaling law established by tokamaks and compact tori.The ETBis formed inside the ergodic field layer of the vacuum field.The ETB formation destabilizes edgecoherent modes such as m/n=1/1,2/3 and 1/2,of which rational surfaces are in the magnetichill.The formed ETB is partially and transiently destroyed by these coherent edge MHD modesand edge localized modes(ELMs)typically observed in Hα signals.The latter ETB is observed ina plasma with large reversed NBI-driven current more than 100 kA at Bt = 1 T.In these plasmas,the edge magnetic shear is enhanced by the current and the rotational transform in the core regionis expected to be appreciably reduced.Thus reduced rotational transform in the plasma centralregion will enhance outward heat and particle fluxes toward ergodic edge layer.The ETB withsteep electron temperature gradient up to~5 keV/m is formed by blocking enhanced outwardheat flux. | K. TOI S. OHDACHI F. WATANABE K. NARIHARA T. MORISAKI 高翔 M. GOTO K. IDA S. MASUZAKI K. MIYAZAWA S. MOR.ITA S. SAKAKIBARA K. TANAKA T. TOKUZAWA K.W. WATANABE 严龙文 M. YOSHINUMA | 2006 | Plasma Science and Technology2006，8，1： | 0 |
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