论文标题
评估具有轨道遵循模拟的磁场中相对论电子传输的能量依赖性
Assessing energy dependence of the transport of relativistic electrons in perturbed magnetic fields with orbit-following simulations
论文作者
论文摘要
实验观测以及理论预测表明，能量电子的运输随能量而降低。运输的减少归因于有限的轨道宽度（FOW）效应。在边缘具有理想均匀随机层的扰动托卡马克磁场中，使用轨道遵循的模拟，我们量化了能量电子传输的能量依赖性并确认先前的理论估计值。但是，使用磁性破坏的磁构型特征，我们发现在较高能量的RE传输没有减少，我们将其归因于模式宽度与次要半径相当，从而使FOW效应可忽略不计。取而代之的是，发现岛屿和非均匀磁扰动的存在更为重要。基于电子能量10 keV-100 meV的模拟，可以在减少的动力学模型中使用这项工作中计算出的扩散辅助传输系数，以说明由于磁场扰动而导致的传输。
Experimental observations, as well as theoretical predictions, indicate that the transport of energetic electrons decreases with energy. This reduction in transport is attributed to finite orbit width (FOW) effects. Using orbit-following simulations in perturbed tokamak magnetic fields that have an ideal homogeneous stochastic layer at the edge, we quantify the energy dependence of energetic electrons transport and confirm previous theoretical estimates. However, using magnetic configurations characteristic of JET disruptions, we find no reduction in RE transport at higher energies, which we attribute to the mode widths being comparable to the minor radius, making the FOW effects negligible. Instead, the presence of islands and nonuniform magnetic perturbations are found to be more important. The diffusive-advective transport coefficients calculated in this work, based on simulations for electron energies 10 keV -- 100 MeV, can be used in reduced kinetic models to account for the transport due to the magnetic field perturbations.
