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首页> 外文期刊>Physics of plasmas >Numerical simulation of runaway electrons: 3-D effects on synchrotron radiation and impurity-based runaway current dissipation
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Numerical simulation of runaway electrons: 3-D effects on synchrotron radiation and impurity-based runaway current dissipation

机译：失控电子的数值模拟：3-D对同步辐射的影响和基于杂质的失控电流耗散

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Numerical simulations of runaway electrons (REs) with a particular emphasis on orbit dependent effects in 3-D magnetic fields are presented. The simulations were performed using the recently developed Kinetic Orbit Runaway electron Code (KORC) that computes the full-orbit relativistic dynamics in prescribed electric and magnetic fields including radiation damping and collisions. The two main problems of interest are synchrotron radiation and impurity-based RE dissipation. Synchrotron radiation is studied in axisymmetric fields and in 3-D magnetic configurations exhibiting magnetic islands and stochasticity. For passing particles in axisymmetric fields, neglecting orbit effects might underestimate or overestimate the total radiation power depending on the direction of the radial shift of the drift orbits. For trapped particles, the spatial distribution of synchrotron radiation exhibits localized "hot" spots at the tips of the banana orbits. In general, the radiation power per particle for trapped particles is higher than the power emitted by passing particles. The spatial distribution of synchrotron radiation in stochastic magnetic fields, obtained using the MHD code NIMROD, is strongly influenced by the presence of magnetic islands. 3-D magnetic fields also introduce a toroidal dependence on the synchrotron spectra, and neglecting orbit effects underestimates the total radiation power. In the presence of magnetic islands, the radiation damping of trapped particles is larger than the radiation damping of passing particles. Results modeling synchrotron emission by RE in DIII-D quiescent plasmas are also presented. The computation uses EFIT reconstructed magnetic fields and RE energy distributions fitted to the experimental measurements. Qualitative agreement is observed between the numerical simulations and the experiments for simplified RE pitch angle distributions. However, it is noted that to achieve quantitative agreement, it is necessary to use pitch angle distri
机译：逃逸电子（RES）具有特别着重于3-d的磁场轨道依赖效应的数值模拟被呈现。使用最近开发的动力学轨迹失控电子码（KORC），计算全轨道在规定的电场和磁场，包括辐射阻尼和碰撞相对论动力学进行了模拟。受关注的两个主要问题是同步辐射和基于杂质-RE消散。同步加速器辐射进行了研究在轴对称领域和在3-d磁性构表现出磁岛和随机性。用于使在轴对称领域颗粒，忽略轨道影响可能低估或高估取决于漂移轨道的径向偏移的方向上的总辐射功率。对于捕集器的颗粒，同步加速器辐射表现出的空间分布的局部在香蕉轨道的前端的“热”点。一般情况下，每个颗粒的辐射功率为俘获颗粒比通过使颗粒发射的功率高。同步辐射的在随机磁场的空间分布，使用MHD代码NIMROD获得，强烈地受到磁岛的存在的影响。 3-d的磁场也介绍关于同步加速器光谱的环形依赖性，并且忽略轨道效果低估了总发射功率。在磁岛的存在，阻尼捕集颗粒的辐射比阻尼传递颗粒的辐射较大。结果建模在DIII-d静态等离子体由RE同步加速器发射还提出。计算用途EFIT重建嵌合在实验测量的磁场和RE的能量分布。定性协议的数值模拟和简化RE俯仰角分布的实验中观察到。然而，值得注意的是，实现定量的协议，因此需要使用俯仰角DISTRI

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