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The scrape-off layer characteristics as a function of the plasma current and density in the FT Tokamak discharges

V Pericoli-Ridolfini1985年Plasma Physics and Controlled FusionIF 2.2出版社

The temperature and the density of the plasma at the limiter shadow of FT (Frascati Tokamak) during ohmic operation and their radial variation have been measured by means of single Langmuir probes. No clear dependence on the radius for the temperature has been found, while the density decays towards the wall exponentially with an e-folding length lambda n approximately 0.5 cm, in agreement with a simple model. The influence of the plasma current Ip and line averaged density n on the scrape-off conditions has been studied. The scrape-off density ne increases with n at a fixed value Ip, but is substantially reduced when Ip is raised, at fixed n. Neither Ip nor n seem to alter the scrape-off temperature Te appreciably, at least in the region accessible to the probes.

日本語訳

オーミック運転中のFT(フラスカティ・トカマク)のリミター・シャドウにおけるプラズマの温度と密度、およびそれらの半径方向の変化が、単一ラングミュアプローブを用いて測定された。温度については半径に対する明確な依存性は見いだされなかったが、密度は壁に向かって指数関数的に減衰し、そのe-folding長はλn≒0.5 cmであり、単純なモデルと一致した。スクレイプオフ条件に対するプラズマ電流Ipと線平均密度nの影響が研究された。スクレイプオフ密度neは、Ipが固定された値ではnとともに増加するが、nが固定された値ではIpが増加すると大幅に減少する。Ipもnも、少なくともプローブが到達可能な領域では、スクレイプオフ温度Teを顕著に変化させるようには見えない。

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Scrape-off layer
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