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Modelling of detachment in a limiter tokamak as a nonlinear phenomenon caused by impurity radiation

M Z Tokar1994年Plasma Physics and Controlled FusionIF 2.2出版社

A numerical one-dimensional radial time-dependent model of particle and energy transport in tokamak plasmas taking the interaction of background and impurity particles through the radiation losses of energy and ion dilution is developed. Detachment in ohmic discharges caused by an increase in the electron density is modelled and the effect of particle and energy transport on detachment conditions is studied. Investigation of dynamic changes in plasma parameters during detachment provoked by an increase in impurity influx is performed. The effect of the nature of heat source on the stabilization of the radiating layer is elucidated. The influence of neo-classical transport and charge-exchange with hydrogen neutrals on the impurity behaviour in 'attached' and 'detached' plasmas is discussed.

日本語訳

トカマクプラズマにおける粒子およびエネルギーの輸送の数値的1次元動径モデルを、背景粒子と不純物粒子の相互作用を放射によるエネルギー損失およびイオン希釈を通じて考慮して構築した。電子密度の増加によって引き起こされるオーミック放電におけるデタッチメントをモデル化し、粒子およびエネルギーの輸送がデタッチメント条件に及ぼす影響を調べた。不純物流入の増加によって引き起こされるプラズマパラメータの動的変化をデタッチメント中に調査した。熱源の性質が放射層の安定化に及ぼす影響を明らかにした。『アタッチド』および『デタッチド』状態における不純物挙動に対する新古典輸送および水素中性粒子との電荷交換の影響を議論した。

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ITERImpurityLimiterDivertor detachment
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