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Evolution of the electron temperature profile of ohmically heated plasmas in TFTR

G. Taylor, P.C. Efthimion, V. Arunasalam, R.J. Goldston, B. Grek, K.W. Hill, D.W. Johnson, K. McGuire, A.T. Ramsey, F.J. Stauffer1986年被引用 18Nuclear FusionIF 3出版社

Blackbody electron cyclotron emission was used to ascertain and study the evolution and behaviour of the electron temperature profile in ohmically heated plasmas in the Tokamak Fusion Test Reactor (TFTR). The emission was measured with absolutely calibrated millimetre wavelength radiometers. The electron temperature profile normalized to the central temperature and the minor radius was observed to broaden substantially with decreasing limiter safety factor qa and to be insensitive to the plasma minor radius. Sawtooth activity was seen in the core of most TFTR discharges and appeared to be associated with a flattening of the electron temperature profile within the plasma core where q ⪅ 1. Two types of sawtooth behaviour were identified in large TFTR plasmas (minor radius a ⪆ 0.8 m): a 'normal' sawtooth with typically 35–40 ms period and a 'compound' sawtooth with 70–80 ms period. The compound sawtooth was characterized by what appeared to be a partial reconnection, which occurs away from the plasma core, in addition to a full reconnection. A multiple linear regression analysis of the central electron temperature Te(0), with toroidal field BT, major radius R, minor radius a, plasma current Ip and effective ion charge Zeff, results in a scaling of the form , for which the major radial dependence was obtained by comparison with earlier PLT data.

日本語訳

黒体電子サイクロトロン放射を用いて、トカマク核融合試験炉(TFTR)におけるオーム加熱プラズマ中の電子温度分布の進化と挙動を確認し、研究した。この放射は、絶対校正されたミリ波長ラジオメータで測定された。中心温度と小半径に正規化した電子温度分布は、リミター安全係数qaの減少に伴って大幅に広がり、プラズマ小半径には鈍感であることが観測された。鋸歯状活動はほとんどのTFTR放電のコア領域で見られ、q ⪅ 1となるプラズマコア内の電子温度分布の平坦化と関連しているように思われた。大型TFTRプラズマ(小半径a ⪆ 0.8 m)では、2種類の鋸歯状挙動が確認された:典型的な周期35〜40 msの「通常の」鋸歯状と、周期70〜80 msの「複合的な」鋸歯状である。複合的な鋸歯状は、完全な再結合に加えて、プラズマコアから離れた場所で発生する部分的な再結合と思われる現象によって特徴づけられた。中心電子温度Te(0)の、トロイダル磁場BT、大半径R、小半径a、プラズマ電流Ip、実効イオン電荷Zeffを用いた多重線形回帰分析により、次の形のスケーリング則が得られた:、この大半径依存性は、以前のPLTデータとの比較によって得られた。

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tftr高精度(タイトル一致)

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Ohmic heatingTFTR
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