The Research of EAST Pedestal Structure and Preliminary Application
The Research of EAST Pedestal Structure and Preliminary Application
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DOI：
10.1088/1009-0630/18/10/01
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发表时间：
2016-04
影响因子：
1.7
通讯作者：
Wang Tengfei;Zang Qing;Hang Xiaofeng;Xia Shumei;Hu Ailan;Zhao Junyu
中科院分区：
文献类型：
--
作者：
Wang Tengfei;Zang Qing;Hang Xiaofeng;Xia Shumei;Hu Ailan;Zhao Junyu
基座特性是高限制模(H模)研究的重要基础。由于实验先进超导托卡马克(EAST)的汤姆逊散射(TS)诊断的空间分辨率是有限的，因此有必要用合适的函数形式来表征托卡马克的基座。基于EAST的模拟和实验数据表明，双线性拟合的双线法比双曲正切(TANH)和修正双曲正切(MTNH)方法具有更好的基座参数重现性。将该方法应用于EAST I类边缘局域模(ELM)放电，发现电子基座密度与线平均密度成正比，边缘压力梯度与基座压力成正比。此外，离子极向陀螺半径被确定为描述基座压强宽度的合适参数。
The pedestal characteristic is an important basis for high confinement mode (H-mode) research. Because of the finite spatial resolution of Thomson scattering (TS) diagnostic on Experimental Advanced Superconducting Tokamak (EAST), it is necessary to characterize the pedestal with a suitable functional form. Based on simulated and experimental data of EAST, it is shown that the two-line method with a bilinear fitting has better reproducibility of pedestal parameters than hyperbolic tangent (tanh) and modified hyperbolic tangent (mtanh) methods. This method has been applied to EAST type I edge localized mode (ELM) discharges, and the electron pedestal density is found to be proportional to the line-averaged density and the edge pressure gradient is found to be proportional to the pedestal pressure. Furthermore, the ion poloidal gyro-radius has been identified as the suitable parameter to describe the pedestal pressure width.