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ELM particle and energy transport in the SOL and divertor of DIII-D

机译：DIII-D的SOL和偏滤器中的ELM粒子和能量传输

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摘要

Results from a series of dedicated experiments measuring the effect of particle and energy pulses from Type-I edge localized modes (ELMs) in the DIII-D scrape-off layer (SOL) and divertor are compared with a simple model of ELM propagation in the boundary plasma. The simple model asserts that the propagation of ELM particle and energy perturbations is dominated by ion parallel convection along SOL field lines and the recovery from the ELM perturbation is determined by recycling physics. Timescales associated with the initial changes of boundary plasma parameters are expected to be on the order of the ion transit time from the outer midplane, where the ELM instability is initiated, to the divertor targets. To test the model, the ion convection velocity is changed in the experiment by varying the plasma density. At moderate to high density, n(e)(Gr) = 0.5-0.8, the delays in the response of the boundary plasma to the midplane ELM pulses, the density dependence of those delays and other observations are consistent with the model. However, at the lowest densities, n(e)(Gr) similar to 0.35, small delays between the responses in the two divertors, and changes in the response of the pedestal thermal energy to ELM events, indicate that additional factors including electron conduction in the SOL, the pre-ELM condition of the divertor plasma, and the ratio of ELM instability duration to SOL transit time, may be playing a role. The results show that understanding the response of the SOL and divertor plasmas to ELMs, for various pre-ELM conditions, is just as important for predicting the effect of ELM pulses on the target surfaces of future devices as is predicting the characteristics of the ELM perturbation of the core plasma. [References: 84]
机译：一系列专用实验的结果与DIII-D刮除层（SOL）和偏滤器中的I型边缘局域模（ELM）的粒子和能量脉冲的影响进行了比较，并与ELM在管道中传播的简单模型进行了比较。边界等离子体。这个简单的模型认为，ELM粒子的传播和能量扰动是由沿SOL场线的离子平行对流主导的，而ELM扰动的恢复是由循环物理学决定的。与边界等离子体参数的初始变化相关的时间尺度预计约为从外层中平面开始的离子迁移时间，在外层中平面（ELM不稳定开始于此）到达分流器目标。为了测试模型，在实验中通过改变等离子体密度来改变离子对流速度。在中等到高密度下，n（e）/ n（Gr）= 0.5-0.8，边界等离子体对中平面ELM脉冲的响应延迟，这些延迟的密度依赖性以及其他观察结果与模型一致。但是，在最低密度n（e）/ n（Gr）类似于0.35时，两个偏滤器的响应之间的延迟很小，并且基座热能对ELM事件的响应发生了变化，这表明包括电子在内的其他因素SOL中的传导，偏滤器等离子体的ELM前状态以及ELM不稳定持续时间与SOL渡越时间之比可能起一定作用。结果表明，在各种预ELM条件下，了解SOL和偏滤器等离子体对ELM的响应，对于预测ELM脉冲对未来设备目标表面的影响与预测ELM扰动的特性一样重要核心血浆。 [参考：84]

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