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H-mode pedestal characteristics, ELMs, and energy confinement in ITER shape discharges on DIII-D

T H Osborne, R J Groebner, L L Lao, A W Leonard, R Maingi, R L Miller, G D Porter, D M Thomas, R E Waltz1998年Plasma Physics and Controlled FusionIF 2.2出版社

The H-mode confinement enhancement factor, H, is found to be strongly correlated with the height of the edge pressure pedestal in ITER shape discharges. In discharges with type I edge-localized modes (ELMs) the pedestal pressure is set by the maximum pressure gradient before the ELM and the width of the H-mode transport barrier. The pressure gradient before type I ELMs is found to scale as would be expected for a stability limit set by ideal ballooning modes, but with values significantly in excess of that predicted by stability code calculations. The width of the H-mode transport barrier is found to scale equally well with pedestal or . The improved H value in high- discharges may be due to a larger edge pressure gradient and wider H-mode transport barrier consistent with their higher edge ballooning mode limit. Deuterium puffing is found to reduce H, which is consistent with the smaller pedestal pressure which results from the reduced barrier width and critical pressure gradient. Type I ELM energy loss is found to be proportional to the change in the pedestal energy.

日本語訳

Hモード閉じ込め増倍因子Hは、ITER形状の放電におけるエッジ圧力ペデスタルの高さと強く相関することが見出された。タイプIエッジ局在モード(ELM)を伴う放電では、ペデスタル圧力はELM前の最大圧力勾配とHモード輸送障壁の幅によって決定される。タイプI ELM前の圧力勾配は、理想バルーニングモードによって設定される安定性限界から期待されるスケーリングを示すが、その値は安定性コード計算による予測値を有意に上回る。Hモード輸送障壁の幅は、ペデスタルβまたはペデスタル圧力と同様にスケーリングすることが見出された。高β放電におけるH値の改善は、より高いエッジバルーニングモード限界と整合的な、より大きなエッジ圧力勾配とより広い輸送障壁幅に起因する可能性がある。重水素ガス入射はHを低下させることが見出されたが、これは輸送障壁幅と臨界圧力勾配の減少に起因するペデスタル圧力の低下と整合的である。タイプI ELMエネルギー損失は、ペデスタルエネルギーの変化に比例することが見出された。

装置

diii-d高精度(タイトル一致)iter高精度(タイトル一致)

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ITERDIII-DEdge localized modeH-modePedestalEnergy confinementH-mode pedestal
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