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.

中文翻译：

---

用轨道跟踪模拟评估扰动场中相对论电子传输的能量依赖性

实验观察以及理论预测表明高能电子的传输随着能量而减少。这种传输减少归因于有限轨道宽度 (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跟踪模拟，我们量化了高能电子传输的能量依赖性并确认了先前的理论估计。然而，使用 JET 中断的磁性配置特征，我们发现在更高能量下 RE 传输没有减少，我们将其归因于模式宽度与小半径相当，使得 FOW 效应可以忽略不计。相反，发现岛和非均匀磁扰的存在更为重要。