论文标题
在ASDEX升级中断中从同步加速器图像中对失控分布函数的时空分析
Spatiotemporal analysis of the runaway distribution function from synchrotron images in an ASDEX Upgrade disruption
论文作者
论文摘要
使用Synchrotron诊断工具软和耦合的流体运动模拟分析了ASDEX升级放电中失控电子（RES）的同步辐射图像。我们表明，失控分布的演变是由最初的热尾种子种群很好地描述的，该种子在当前淬火期间加速到25-50 MEV之间，以及雪崩失控的尾巴，其能量呈指数降低。我们发现，尽管雪崩组件具有绝大多数电流，但主要的高能种子残留物主要主导同步加速器发射。有了来自流体运动模拟的见解，开发了失控种子成分演变的分析模型，并用于重建RE束的径向密度谱。分析表明，观察到的同步加速器模式从圆形到新月形的变化是由失控密度的径向谱的快速重新分布引起的。
Synchrotron radiation images from runaway electrons (REs) in an ASDEX Upgrade discharge disrupted by argon injection are analyzed using the synchrotron diagnostic tool SOFT and coupled fluid-kinetic simulations. We show that the evolution of the runaway distribution is well described by an initial hot-tail seed population, which is accelerated to energies between 25-50 MeV during the current quench, together with an avalanche runaway tail which has an exponentially decreasing energy spectrum. We find that, although the avalanche component carries the vast majority of the current, it is the high-energy seed remnant that dominates synchrotron emission. With insights from the fluid-kinetic simulations, an analytic model for the evolution of the runaway seed component is developed and used to reconstruct the radial density profile of the RE beam. The analysis shows that the observed change of the synchrotron pattern from circular to crescent shape is caused by a rapid redistribution of the radial profile of the runaway density.
