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High recycling steady H-mode regime in the JFT-2M tokamak

K Kamiya, M Bakhtiari, S Kasai, H Kawashima, Y Kusama, Y Miura, H Ogawa, N Oyama, M Sato, K Shinohara2004年Plasma Physics and Controlled FusionIF 2.2出版社

A new operating regime, 'high recycling steady' (HRS) H-mode regime, has been discovered in the JFT-2M tokamak. It is easily reproduced with neutral beam heating of any co-, balanced-, or counter-injection under wall fuelling from the boronized first wall. The HRS is characterized by good energy confinement (H89P ∼ 1.6) at a high density (ne/nGW ∼ 0.7; nGW is the Greenwald density), low radiation loss power fraction (, typically), and the complete disappearance of large ELMs. Accompanying the HRS H-mode transition, the coherent magnetic fluctuations in the frequency range of the order of 10–100 kHz with significant variation are seen on magnetic probes at the vessel wall. In addition, the HRS H-mode edge condition is compatible with an improved core confinement. We have demonstrated that an internal transport barrier can be produced under a HRS H-mode edge condition, achieving βNH89P ∼ 6 at ne/nGW ∼ 0.7–1.0, transiently.

日本語訳

JFT-2Mトカマクにおいて、新しい運転領域である「高リサイクリング定常」(HRS)Hモード領域が発見された。これは、ボロナイズされた第一壁からの壁燃料供給を伴う、任意の共方向、バランス方向、または逆方向の中性粒子ビーム加熱によって容易に再現される。HRSは、高密度(ne/nGW ∼ 0.7;nGWはグリーンワルド密度)における良好なエネルギー閉じ込め(H89P ∼ 1.6)、低い放射損失電力割合(、典型的には)、および大きなELMの完全な消失によって特徴づけられる。HRS Hモード遷移に伴い、10–100 kHzのオーダーの周波数範囲におけるコヒーレントな磁気揺動が、容器壁の磁気プローブで有意な変動を伴って観測される。さらに、HRS Hモードの周辺条件は、改善されたコア閉じ込めと両立する。我々は、HRS Hモードの周辺条件下で内部輸送障壁が生成可能であることを実証し、ne/nGW ∼ 0.7–1.0においてβNH89P ∼ 6を過渡的に達成した。

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