辐射反应引起逃逸电子分布的非单调特征
Radiation reaction induced non-monotonic features in runaway electron distributions
摘要：
在感应电场超过某个临界值的等离子体中产生的逃逸电子可以达到MeV范围内的非常高的能量。对于这样的高能电子，辐射损失将对动量空间动力学做出显着贡献。在某些条件下，由于辐射动量损失，在逃逸的电子尾中会形成一个非单调的特征--“凸点”，从而产生凸点-尾型不稳定性。这里我们研究凸块存在的条件。我们推导出一个分析的阈值条件的凸块出现，并给出了一个近似表达式的最小能量，凸块可以出现。数值计算进行支持的分析推导。
英文摘要：
Runaway electrons, which are generated in a plasma where the induced electric field exceeds a certain critical value, can reach very high energies in the MeV range. For such energetic electrons, radiative losses will contribute significantly to the momentum space dynamics. Under certain conditions, due to radiative momentum losses, a non-monotonic feature - a "bump" - can form in the runaway electron tail, creating a potential for bump-on-tail-type instabilities to arise. Here we study the conditions for the existence of the bump. We derive an analytical threshold condition for bump appearance and give an approximate expression for the minimum energy at which the bump can appear. Numerical calculations are performed to support the analytical derivations.
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