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High density experiments with gas puffing and ECRH in T-10

Yu V Esipchuk, N A Kirneva, A A Borschegovskij, V V Chistyakov, V Ph Denisov, M M Dremin, E P Gorbunov, S A Grashin, D V Kalupin, L N Khimchenko2003年Plasma Physics and Controlled FusionIF 2.2出版社

High density experiments were carried out in T-10 with gas puffing and electron cyclotron resonance heating (with absorbed power value up to 1.4 MW) with oblique and perpendicular power launch. Densities exceeding the Greenwald limit (nGw) by up to a factor of 1.8 were achieved in a regime with a high value of the edge safety factor at the current flat-top, q(a)≅8.2. The decrease of q(a) to a value of 3 led to the reduction of the ratio (e) lim /nGw to 1. Confinement degradation with density increase was not significant up to the density limit. However, the typical T-10 linear increase of energy confinement time with density saturates at e⩾0.6nGw. This saturation is the result of the development of an additional transport in the electron heat channel. However, the saturated τE values exceeded the ITER L-mode scaling predictions by up to a factor of 1.2 and were close to the value predicted by the ITER H-mode scaling. Effect of the strong gas puffing on the plasma confinement and experiments with neon seeding are also discussed in this paper.

日本語訳

高密度実験は、T-10においてガス入射および電子サイクロトロン共鳴加熱(吸収パワー値は最大1.4 MW)を用いて、斜めおよび垂直パワー入射により実施された。グリーンワルド限界(nGw)を最大1.8倍超える密度が、電流平坦部における高いエッジ安全係数値q(a)≅8.2の領域で達成された。q(a)を3まで低下させると、密度限界(nGwに対する比)は1まで減少した。密度限界までの密度増加に伴う閉じ込めの劣化は顕著ではなかった。しかしながら、典型的なT-10におけるエネルギー閉じ込め時間の密度に対する線形増加は、e⩾0.6nGwで飽和する。この飽和は、電子熱輸送チャネルにおける追加輸送の発生に起因する。しかしながら、飽和したτE値は、ITERのLモードスケーリング予測を最大1.2倍上回り、ITERのHモードスケーリング予測に近い値であった。強いガス入射がプラズマ閉じ込めに及ぼす影響およびネオン入射を用いた実験についても、本論文で議論する。

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Electron cyclotron heatingGas puff
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