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Measurement of the hot electrical conductivity in the PBX-M tokamak

G. Giruzzi, E. Barbato, S. Bernabei, A. Cardinali1997年被引用 41Nuclear FusionIF 3出版社

A new method for the analysis of tokamak discharges in which the plasma current is driven by a combination of high power RF waves and a DC electric field is presented. In such regimes, which are the most usual in RF current drive experiments, it is generally difficult to separate the different components of the plasma current, i.e. purely ohmic, purely non-inductive and cross terms. If the bilinear (in wave power and electric field) cross-term is the dominant one, an explicit relation between the loop voltage drop and the injected power can be found. This relation involves two parameters, the purely RF current drive efficiency and the hot (power dependent) electrical conductivity. These can be simultaneously determined from a simple two parameter fit, if the loop voltage drop is measured at several RF power levels. An application to lower hybrid current drive experiments in the Princeton Beta Experiment (PBX-M) tokamak is presented. It is shown that the method also allows independent evaluation of the average power absorption fraction and the n|| upshift

日本語訳

プラズマ電流が高出力RF波と直流電場の組み合わせによって駆動されるトカマク放電を解析するための新しい方法が提示される。そのような領域はRF電流駆動実験において最も一般的であるが、そこではプラズマ電流の異なる成分、すなわち純オーミック成分、純非誘導成分、および交差項を分離することは一般に困難である。(波パワーと電場に関して)双線形の交差項が支配的であるならば、ループ電圧降下と入射パワーの間の明示的な関係を見出すことができる。この関係は、純RF電流駆動効率と高温(パワー依存性)電気伝導度という2つのパラメータを含む。これらは、ループ電圧降下が複数のRFパワーレベルで測定されるならば、単純な2パラメータフィットから同時に決定できる。プリンストン・ベータ実験(PBX-M)トカマクにおける低混成波電流駆動実験への応用が提示される。この方法が平均パワー吸収割合とn||アップシフトの独立した評価も可能にすることが示される。

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