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31.
Takechi M Matsunaga G Aiba N Fujita T Ozeki T Koide Y Sakamoto Y Kurita G Isayama A Kamada Y;JT- team 《Physical review letters》2007,98(5):055002
The plasma rotation necessary for stabilization of resistive-wall modes (RWMs) is investigated by controlling the toroidal plasma rotation with external momentum input by injection of tangential neutral beams. The observed threshold is 0.3% of the Alfvén velocity and much smaller than the previous experimental results obtained with magnetic braking. This low critical rotation has a very weak beta dependence as the ideal wall limit is approached. These results indicate that for large plasmas such as in future fusion reactors with low rotation, the requirement of the additional feedback control system for stabilizing RWM is much reduced. 相似文献
32.
Bindslev H Nielsen SK Porte L Hoekzema JA Korsholm SB Meo F Michelsen PK Michelsen S Oosterbeek JW Tsakadze EL Westerhof E Woskov P;TEXTOR team 《Physical review letters》2006,97(20):205005
Here we present the first measurements by collective Thomson scattering of the evolution of fast-ion populations in a magnetically confined fusion plasma. 150 kW and 110 Ghz radiation from a gyrotron were scattered in the TEXTOR tokamak plasma with energetic ions generated by neutral beam injection and ion cyclotron resonance heating. The temporal behavior of the spatially resolved fast-ion velocity distribution is inferred from the received scattered radiation. The fast-ion dynamics at sawteeth and the slowdown after switch off of auxiliary heating is resolved in time. The latter is shown to be in close agreement with modeling results. 相似文献
33.
YM Jeon JK Park SW Yoon WH Ko SG Lee KD Lee GS Yun YU Nam WC Kim JG Kwak KS Lee HK Kim HL Yang;KSTAR team 《Physical review letters》2012,109(3):035004
Edge localized modes (ELMs) in high-confinement mode plasmas were completely suppressed in KSTAR by applying n=1 nonaxisymmetric magnetic perturbations. Initially, the ELMs were intensified with a reduction of frequency, but completely suppressed later. The electron density had an initial 10% decrease followed by a gradual increase as ELMs were suppressed. Interesting phenomena such as a saturated evolution of edge T_{e} and broadband changes of magnetic fluctuations were observed, suggesting the change of edge transport by the applied magnetic perturbations. 相似文献
34.
安徽大学数学建模教学小组 《大学数学》2008,24(5)
讨论引自文献[1]和[2]的一个很有趣的数学建模问题.我们给出一个出乎意料的有趣答案.所作的证明也包含一定的技巧. 相似文献