Impact of Atomic Data on Tokamak Modeling
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概要
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The behavior of plasmas in Tokamaks has been considerably well understood by extensive studies in the last two decades. Yet one cannot help using such empirical relations for designing Tokamaks that require deeper understandings. Recent progress in spectroscopic studies cuts wedges through the cloudy atmosphere to clarify what is happening in Tokamaks. The Tokamak is a device which forms a magnetohydrodynamically stable plasma separated from the container wall. Microscopically, however, there are a number of processes which cause the loss of particles and radiation that hit solid walls. Wall materials are therefore scraped off and fed in a hot plasma to become impurities. The impuries enhance the particle and radiation loss in various ways and often destroy the otherwise stable plasma. The impuries are mostly heavy elements such as oxygen and iron, and they give a major contribution to the radiation loss, even if their density is a fraction of per mil, and also enhance the particle loss by a factor of the square root of the ion-electron mass ratio. The effect of impurities is of great importance at the plasma boundary. The plasma near the boundary is exposed to impurity particles emitted from the wall and is cooled by ionization and excitation thereof which are mostly neutral atoms. Ions in the plasma are lost by the charge exchange collisions with impurity atoms. Hence the plasma profile at the boundary becomes sharp and corrugated, and therefore the plasma is liable to disruption. It is important to note for the cooling process that the radiation loss rate has tripple values against temperature, as shown in Figure 1.
- 核融合科学研究所の論文
著者
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Hayakawa S
Department Of Astrophysics Nagoya University
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HAYAKAWA S.
Department of Applied Chemistry, Faculty of Engineering, University of Tokyo
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