EAST装置电子模湍流径向相关性实验研究

托卡马克装置等离子体电子及电子热输运反常主要缘于电子模湍流。随着等离子体电子温度及密度的增加，托卡马克装置径向不同区域等离子体参数的梯度变化将有所区别，相应的不同区域的连续多尺度湍流变化也将有所不同，径向电子的反常输运特性是否仅仅依赖于径向不同区域的电子模湍流特性？径向不同区域的电子模湍流相关性是否影响电子的径向输运？这些需要通过实验来验证。通过改变二氧化碳激光相干散射诊断激光探测束与托卡马克装置磁轴的角度，可实现托卡马克装置等离子体密度涨落的区域性分辨测量。我们将通过EAST装置径向相邻区域等离子体密度涨落的同步测量，运用低杂波、离子回旋波加热、驱动手段，改变等离子体区域的温度梯度及流的剪切量，研究径向相邻区域等离子体电子模湍流相关性与等离子体径向电子输运的联系。

Short-scale turbulence such as electron temperature gradient (ETG) mode and trapped electron mode (TEM) is considered to be a major candidate in producing anomalous electron transport in tokamak device. Along with the increase of plasma electron temperature or electron density, the change of gradient scale length about main plasma parameters will be unlike in different radial area, the corresponding variation of continuous multi-scale turbulence will also be shifted. Do the features of the radial abnormal electron transport only depend on characters of ETG mode or TEM mode in different radial area? Does the correlation of ETG mode or TEM mode among different radial area affect the radial electron transport? This needs to be verified by experiment. Changing the angle between the detective CO2 beam laser (CTS diagnostics) and the magnetic axis, we can implement the measurement of localized turbulence. Density fluctuation of radial adjacent area will be explored simultaneously in EAST tokamak. Using the method of EAST tokamak device's wave heating and driving of wave (LHW or ICRF), we can modify the localized temperature gradient and the level of shear flow, and then we will do some research on the relationship between different radial area's correlation of ETG mode or TEM mode and the radial electron transport.