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<專題討論>2017/3/23(四)14:10綜合大樓2樓48218教室演講「Introduction to tokamak experiments」( Dr. Hyungho Lee / KSTAR Research Center, National Fusion Research Institute, Korea )

張貼者:2017年3月16日 下午8:48Dabby Lu   [ 已更新 2017年3月16日 下午8:54 ]
This talk provides a brief overview of tokamak experiments. The tokamak is widely recognized as the most promising candidate for realizing a nuclear fusion power plant.  However, there still remain many issues to be resolved in order to harness the fusion energy in a tokamak.  The critical parameters for realizing fusion energy reactor can be found in the fusion triple product ni Ti tE, which results from a power balance consideration. Here, ni , Ti  and tE   are the ion density, the ion temperature, and plasma energy confinement time, respectively. Thus, the tokamak research has been dominated by the search for improved confinement regime (tE ) with high plasma pressure (ni  and Ti ). In this talk, the history of research into improved confinement regimes such as H-mode and ITB discharges are briefly introduced followed by a short overview of theoretical and numerical models which have been suggested to understand the confinement regimes. On the one hand, it has been observed that improved confinement regimes occasionally accompany several macroscopic magneto- hydrodynamics (MHD) modes such as tearing modes and edge localized modes. To avoid their harmful effects on the plasma operation, we have to suppress or mitigate them in a reactor-sized tokamak plasma.  Here, the experimental efforts in suppressing these MHD modes are briefly discussed.  In a reactor-sized tokamak, the high heat flux from high pressure plasma onto the plasma facing components is also one of critical issues. Thus, searching for the effective power exhausting methods has become one of main research goals in fusion community. Several experimental achievements in this research field are also included in this talk.
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Dabby Lu,
2017年3月16日 下午8:48
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