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Degradation of energy and particle confinement in high-density ELMy H-mode plasmas on JT-60U

N Asakura, K Shimizu, H Shirai, Y Koide, T Takizuka1997年Plasma Physics and Controlled FusionIF 2.2出版社

Degradation of energy and particle confinement was investigated with a high-recycling divertor in ELMy H-mode plasma on JT-60U with high-power neutral beam injection of 18 - 19 MW; the plasma parameters were fixed at . The reduction in global energy confinement time was due to a reduction in the stored energy of fast ions with increasing plasma density, while the thermal energy confinement time decreased slightly from 0.088 - 0.092 s to 0.083 s under an attached divertor condition. On the other hand, the global particle confinement time decreased greatly from 0.13 to 0.08 s due to increase in neutral influx from the divertor. Combining the results, decreased from 1.5 to 1. Increased neutral density and enhanced asymmetry in the poloidal direction had less effect on maintaining the edge transport barrier as long as the attached divertor condition was maintained.

日本語訳

高リサイクリング・ダイバータを有するELMy Hモードプラズマにおいて、JT-60Uでの高出力中性粒子ビーム入射(18〜19 MW)によるエネルギーおよび粒子閉じ込めの劣化を調査した。プラズマパラメータは[値]に固定された。全エネルギー閉じ込め時間の減少は、プラズマ密度の増加に伴う高速イオンの蓄積エネルギーの減少によるものであり、一方、熱エネルギー閉じ込め時間は、アタッチド・ダイバータ条件下で0.088〜0.092秒から0.083秒へとわずかに減少した。他方、全粒子閉じ込め時間は、ダイバータからの中性粒子流入の増加により、0.13秒から0.08秒へと大幅に減少した。これらの結果を組み合わせると、[値]は1.5から1へと減少した。アタッチド・ダイバータ条件が維持される限り、中性粒子密度の増加とポロイダル方向の非対称性の増強は、エッジ輸送障壁の維持に及ぼす影響は小さかった。

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Edge localized modeH-modeJT-60UELMy H-mode
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