Edge-core relationship of ELMy H-mode plasmas in JT-60U
Edge-core relationship of ELMy H-mode plasmas in JT-60U
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JT-60U 中 ELMy H 模式等离子体的边缘-核心关系
DOI：
10.1088/0741-3335/44/5a/348
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发表时间：
2002
影响因子：
2.2
通讯作者：
T. Fukuda
中科院分区：
文献类型：
--
作者：
H. Urano;Y. Kamada;H. Shirai;T. Takizuka;H. Kubo;H. Takenaga;Y. Miura;T. Hatae;T. Fukuda
本文分析了JT-60U上(1)高三角度和(2)Ar种子Elmy H模等离子体的传导热流对能量输运的影响。在对数曲线图上，等离子体核的温度分布是保形的，与基座高度无关。随着导热通量的增加，有效导热系数Xef自我调整，以在等离子体核心中保持恒定的⊇(InTi)。在高三角度放电中，随着β极化率的增加，边界温度升高，能量约束质量得到很大改善，并伴随着较高的堆芯温度。另一方面，Ar种子放电中的峰值密度分布允许底座肩部的温度比没有注入Ar气体的情况下更高，并且核心温度也被提高。在没有Ar气体注入的情况下，随着Ar种子H模等离子体中辐射损失通量的增加，传导热流密度减小，Xeff值与等离子体核的V(Ln Ti)相近。由于Ar气体喷发，改善了粒子的约束，提高了可实现的密度，并有助于降低Xeff.
t The effects of the conductive heat flow on the energy transport concerning the temperature profile similarity have been analysed for (1) high triangularity and (2) Ar seeded ELMy H-mode plasmas on JT-60U. The temperature profiles of the plasma core on the logarithmic plot are shape preserving and independent of the varying pedestal height. As the conductive heat flux increases, the effective heat conductivity, X eff , adjusts itself to sustain a constant ⊇(ln T i ) in the plasma core. In high triangularity discharges, highly improved energy confinement quality accompanied by high core temperature is obtained when the boundary temperature rises with an increase in β pol . On the other hand, the peaked density profiles in Ar seeded discharges allow the temperature at the pedestal shoulder to be higher relative to the cases without Ar gas injection, and the core temperature is also raised. As the conductive heat flux is reduced by increasing the radiation loss flux in Ar seeded H-mode plasmas, X eff decreases with a similar V(ln T i ) of the plasma core in the case without Ar gas injection. Improved particle confinement due to Ar gas puff raises the achievable density and contributes to the reduction in X eff .