超相对论性Laser -等离子体相互作用中普适强度标度的反常
Anomalies in Universal Intensity Scaling in Ultrarelativistic Laser-Plasma Interactions
摘要：
以电子动力学为超相对论性的强度入射到目标上的激光会产生延伸到高阶的谐波功率谱，其特征是谐波数m的相对缓慢的衰减，遵循幂律依赖性m^{-p}。相对论相似性理论预言了p = 8/3直到某个截止值m = m* 的普适值。在这项工作中提出的结果表明，在条件下，等离子体效应有助于发射光谱，这种贡献的程度可能会使普遍衰变的概念无效。我们报告了一个在超相对论范围内的谐波数衰变，其特征在于指数为5/3 < p < 7/3，明显弱于相似模型预测的结果。
英文摘要：
Laser light incident on targets at intensities such that the electron dynamics is ultrarelativistic gives rise to a harmonic power spectrum extending to high orders and characterized by a relatively slow decay with the harmonic number m that follows a power law dependence, m^{-p}. Relativistic similarity theory predicts a universal value for p = 8/3 up to some cut-off m = m*. The results presented in this work suggest that under conditions in which plasma effects contribute to the emission spectrum, the extent of this contribution may invalidate the concept of universal decay. We report a decay with harmonic number in the ultrarelativistic range characterised by an index 5/3 < p < 7/3, significantly weaker than that predicted by the similarity model.
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