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Thermal energy confinement of high-triangularity ELMy H-mode plasmas in JT-60U

H Urano, Y Kamada, H Shirai, T Takizuka, H Kubo, T Hatae, T Fukuda2002年Plasma Physics and Controlled FusionIF 2.2出版社

High-triangularity ELMy H-mode experiments (δx~0.45) have been carried out in JT-60U. In the low-density regime (e/nGW<0.5), the discharges are characterized by type-I ELMs and high-triangularity plasmas produced higher H-mode pedestal pressure than low-triangularity plasmas (δx~0.20). In the high-density regime (e/nGW>0.5), at fixed neutral beam heating power type-III ELMs are generated and the pedestal pressure reduces gradually with density whereas the ELM frequency at low triangularity is much lower at a given density. Compared to low-triangularity plasmas at low densities, higher pedestal temperature was obtained at high triangularity and the core temperature was also improved by almost the same factor. The profiles of temperature are stiff in the sense that there seems to exist a minimum scale length of temperature gradient. Since plasma shaping affects strongly the peripheral region of toroidal magnetic flux surfaces, the improvement of the edge stability by triangularity leads to higher pedestal temperature, which in turn raises the core temperature.

日本語訳

高三角形度ELMy Hモード実験(δx~0.45)がJT-60Uで実施された。低密度領域(e/nGW<0.5)では、放電はタイプI ELMによって特徴づけられ、高三角形度プラズマは低三角形度プラズマ(δx~0.20)よりも高いHモードペデスタル圧力を生成した。高密度領域(e/nGW>0.5)では、固定された中性粒子ビーム加熱パワーにおいてタイプIII ELMが生成され、ペデスタル圧力は密度とともに徐々に減少する。一方、低三角形度におけるELM周波数は、所定の密度ではるかに低い。低密度における低三角形度プラズマと比較して、高三角形度ではより高いペデスタル温度が得られ、コア温度もほぼ同じ係数で改善された。温度分布は、温度勾配の最小スケール長が存在するように思われるという意味で、スティフである。プラズマ形状はトロイダル磁気面の周辺領域に強く影響するため、三角形度によるエッジ安定性の向上はより高いペデスタル温度をもたらし、それが今度はコア温度を上昇させる。

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Edge localized modeH-modeJT-60UEnergy confinementTriangularityELMy H-mode
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