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Spectroscopic measurements of the ion temperature profilein front of a limiter in TEXTOR-94

A Huber, A Pospieszczyk, B Unterberg, M Brix, Ph Mertens, V Philipps, B Schweer2000年Plasma Physics and Controlled FusionIF 2.2出版社

Ion temperatures have been measured in front of a limiter inTEXTOR-94 under various plasma conditions by means of theDoppler broadening of the C5+ line (λ = 529 nm), which is excited by charge exchange processes withhydrogen (deuterium) atoms recycled at the limiter surface. Theion temperatures have been compared with electron temperaturesmeasured by atomic beam techniques. It has been found that theion temperatures are considerably larger than those of theelectrons. In the scrape-off layer (SOL) the ratio between the ionand electron temperatures (Ti/Te) can reachvalues of up to three at low plasma densities, but this ratiodecreases with increasing density. The SOL e-folding lengthof the ion temperature is much larger than that of the electrontemperature. The influence of the test limiter position rL on the ion temperature measurements has been investigatedbut found to be of no significant importance.

日本語訳

イオン温度は、TEXTOR-94におけるリミッター前面で、種々のプラズマ条件下において、リミッター表面でリサイクルされた水素(重水素)原子との電荷交換過程によって励起されたC5+線(λ = 529 nm)のドップラー広がりを用いて測定された。イオン温度は、原子ビーム法によって測定された電子温度と比較された。イオン温度は電子温度よりもかなり高いことが見出された。スクレイプオフ層(SOL)において、イオン温度と電子温度の比(Ti/Te)は、低プラズマ密度では最大3に達し得るが、この比は密度の増加とともに減少する。SOLのイオン温度のe-folding長は、電子温度のそれよりもはるかに大きい。テストリミッター位置rLがイオン温度測定に及ぼす影響が調査されたが、有意な重要性はないことが見出された。

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