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Advances in the physics of steady-state plasmas by long pulse experiments on Tore Supra

G Giruzzion behalf of the Tore Supra Team2005年Plasma Physics and Controlled FusionIF 2.2出版社

Long pulse, multi-MW operation on Tore Supra, with active control of the main plasma parameters and new diagnostics, has allowed the investigation of several important issues relevant to the physics of steady-state plasmas, sometimes leading to the discovery of new physics effects. Results obtained in the most recent experimental campaigns are reported. Discharges lasting several resistive times, with combined LHCD and minority ICRH at high power level (>10 MW) in plasmas close to the Greenwald limit, at Te ∼ Ti, were realized. In these discharges, toroidal rotation velocities of the order of 50 km s−1 induced by ICRH were measured by charge exchange spectroscopy. Doppler backscattering was used to complete these measurements and to provide turbulence spectra. MHD phenomena characteristic of steady-state plasmas, such as double tearing modes, were studied using a new 32-channel ECE radiometer and correlation ECE. After the discovery of stationary regimes characterized by non-linearly coupled temperature and current oscillations, a new regime was observed, characterized by spontaneous transitions between two cycles of electron temperature oscillations: low-amplitude (ΔTe/Te ∼ 0.1) and giant (ΔTe/Te > 0.5).

日本語訳

Tore Supraにおける長時間パルス・多メガワット運転は、主要プラズマパラメータの能動制御と新しい診断装置を用いることにより、定常状態プラズマの物理に関連するいくつかの重要な問題の研究を可能にし、時には新しい物理効果の発見につながった。最も最近の実験キャンペーンで得られた結果が報告される。Greenwald限界に近いプラズマにおいて、Te ∼ Tiの条件下で、高出力レベル(>10 MW)のLHCDと少数派ICRHを組み合わせた、数回の抵抗性時間にわたる放電が実現された。これらの放電では、ICRHによって誘起された約50 km s−1のトロイダル回転速度が、電荷交換分光法により測定された。ドップラー後方散乱を用いてこれらの測定を補完し、乱流スペクトルを提供した。二重テアリングモードなどの定常状態プラズマに特徴的なMHD現象は、新しい32チャンネルECEラジオメータと相関ECEを用いて研究された。非線形的に結合した温度・電流振動を特徴とする定常状態の発見後、電子温度振動の2つのサイクル間の自発的遷移を特徴とする新しい状態が観測された:低振幅(ΔTe/Te ∼ 0.1)と巨大振幅(ΔTe/Te > 0.5)である。

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