Analysis of performance degradation in an electron heating dominant H-mode plasma after ECRH termination in EAST
Analysis of performance degradation in an electron heating dominant H-mode plasma after ECRH termination in EAST
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EAST 中 ECRH 终止后电子加热主导 H 模式等离子体的性能退化分析
DOI：
10.1088/1741-4326/aabaab
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发表时间：
2018-04
期刊：
影响因子：
3.3
通讯作者：
Gong Xianzu
中科院分区：
文献类型：
--
作者：
Du Hongfei;Ding Siye;Chen Jiale;Wang Yifeng;Lian Hui;Xu Guosheng;Zhai Xuemei;Liu Haiqing;Zang Qing;Lyu Bo;Duan Yanmin;Qian Jinping;Gong Xianzu
在最近的EAST实验中，在电子加热占主导地位的H模式等离子体的电子回旋共振加热终止后，观察到显着的性能下降伴随着内部电感的减少。计算了低杂波沉积和有效电子热扩散率，解释了这一现象。分析表明，LHW加热沉积的变化而不是输运的增加是导致能量约束显著降低的原因（）。约束退化发生在一个长的时间尺度上的原因可以归因于良好的本地能量约束的核心，也LHW沉积的磁剪切的依赖性。电子温度分布在电子加热占主导地位的近轴区域比大半径区域显示出更弱的刚度。用线性GYRO方法计算了堆芯等离子体中从低k到高k的不稳定电子模，与实验结果定性一致。对等离子体性能退化机制的理解将有助于找到改善EAST射频主导方案中全局约束的方法。
In recent EAST experiments, significant performance degradation accompanied by a decrease of internal inductance is observed in an electron heating dominant H-mode plasma after the electron cyclotron resonance heating termination. The lower hybrid wave (LHW) deposition and effective electron heat diffusivity are calculated to explain this phenomenon. Analysis shows that the changes of LHW heating deposition rather than the increase of transport are responsible for the significant decrease in energy confinement (). The reason why the confinement degradation occurred on a long time scale could be attributed to both good local energy confinement in the core and also the dependence of LHW deposition on the magnetic shear. The electron temperature profile shows weaker stiffness in near axis region where electron heating is dominant, compared to that in large radius region. Unstable electron modes from low to high k in the core plasma have been calculated in the linear GYRO simulations, which qualitatively agree with the experimental observation. This understanding of the plasma performance degradation mechanism will help to find ways of improving the global confinement in the radio-frequency dominant scenario in EAST.
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影响因子：
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