Impurity effects on drift wave stability and impurity transport
Impurity effects on drift wave stability and impurity transport
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DOI：
10.1088/0029-5515/33/1/i05
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发表时间：
1993
期刊：
影响因子：
3.3
通讯作者：
R. Dominguez;G. Staebler
中科院分区：
文献类型：
--
作者：
R. Dominguez;G. Staebler
采用全动力学剪切板模型，对三组分等离子体（电子、原离子和杂质离子）中静电离子温度梯度（ITG）和耗散捕获电子（DTE）模式进行了数值线性稳定性分析。还计算了每一种粒子的准线性粒子通量和能量通量。对于ITG模式，发现增加血浆稀释度（增加Zeff）和增加Zeff曲线的峰度都有很强的稳定性。由ITG模态湍流驱动的总异常能量流的准线性计算表明，对于接近平坦且中等低值（Zeff 2）的Zeff曲线，可能存在能量“掐点”。讨论了这一结果与最近的DIII-D离轴加热实验的可能联系。这种向内的能量流动的一个伴随特征是原生离子粒子向内流动，杂质离子粒子向外流动，大大超过新古典水平。杂质对DTE模式的影响是相反的，即稀释度的增加和Zeff剖面的峰性是强烈的不稳定因素。因此，准线性理论预测了异常电子能量通量的大幅增加，而对离子种类异常通量的影响要小得多
A numerical linear stability analysis of electrostatic ion temperature gradient (ITG) and dissipative trapped electron (DTE) modes in a three-component plasma (electrons, primary ions and impurity ions) is performed using a fully kinetic, sheared slab model. The quasi-linear particle and energy fluxes for each species are also computed. For the ITG mode, it is found that increasing plasma dilution (increasing Zeff) as well as increasing peakedness of the Zeff profile are strongly stabilizing. The quasi-linear calculations of the total anomalous energy flow driven by ITG mode turbulence shows that for Zeff profiles that are nearly flat and of moderately low value (Zeff 2), an energy 'pinch' is possible. A possible connection of this result with recent DIII-D off-axis heating experiments is discussed. A concomitant feature of this inward energy flow is an inward flow of primary ion particles, and an outward flow of impurity ion particles that greatly exceeds the neoclassical level. The impurity effects on the DTE mode are opposite, i.e. increasing dilution and Zeff profile peakedness are strongly destabilizing. As a result, quasi-linear theory predicts a large increase in the anomalous electron energy flux and much smaller effects on the anomalous fluxes of the ion species