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Transport and turbulence studies in the T-10 tokamak

M.V. Ossipenko, the T-10 team2003年被引用 12Nuclear FusionIF 3出版社

Transitions to the improved confinement regimes were studied in the T-10 tokamak with electron cyclotron resonance heating (ECRH). The H-mode regime with and without internal transport barrier (ITB) was obtained and studied. The H-mode was obtained by power increase, pellet injection and biasing. The confinement time in the pellet enhanced confinement regime is 30% higher than that in the spontaneous H-mode. In biasing experiments an enhancement factor of up to 1.55 was obtained for the energy confinement time. It was shown that subtle changes in the safety factor q profile allow us to obtain either ITB or external transport barrier only, or both of them, other conditions being approximately similar. The global confinement in the regime with the density above the Greenwald limit under strong gas-puffing and ECRH was investigated. To identify the type of turbulence responsible for transport, the Ohmic and ECRH regimes with variation of safety factor at the limiter qL and gas puffing were considered. Two regions were observed along the minor radius with different turbulence properties.

日本語訳

T-10トカマクにおける電子サイクロトロン共鳴加熱(ECRH)を用いた改善閉じ込め状態への遷移を研究した。内部輸送障壁(ITB)を伴う場合と伴わない場合のHモード状態を実現し、研究を行った。Hモードは、出力増加、ペレット入射、バイアス印加によって達成された。ペレット入射による改善閉じ込め状態における閉じ込め時間は、自然発生的なHモードよりも30%高い値を示した。バイアス実験では、エネルギー閉じ込め時間について最大1.55倍の向上係数が得られた。安全係数qプロファイルのわずかな変化により、他の条件がほぼ同様であっても、内部輸送障壁のみ、外部輸送障壁のみ、あるいはその両方を実現できることが示された。強いガス入射とECRH下でグリーンワルド限界を超える密度領域における全体閉じ込めを調査した。輸送の原因となる乱流の種類を特定するため、リミター部の安全係数qLとガス入射を変化させたオーミックおよびECRH状態を検討した。小半径方向に沿って、異なる乱流特性を示す2つの領域が観測された。

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