Phase space dynamics after the breaking of a relativistic Langmuir wave in a thermal plasma
Phase space dynamics after the breaking of a relativistic Langmuir wave in a thermal plasma
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热等离子体中相对论性朗缪尔波破裂后的相空间动力学
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
F. Pegoraro
中科院分区：
文献类型：
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作者：
A. Grassi;L. Fedeli;A. Macchi;S. V. Bulanov;F. Pegoraro
为了研究热等离子体中相对论性朗缪尔波的相空间发展，在欧拉框架下对相对论性弗拉索夫方程进行了数值积分。相对论运动学和电子束加载效应导致电子在相空间中演化所需的时间中的“差分延迟”，最大动量的电子花费最长的时间。这导致了在动量空间中以接近光速的速度传播的波裂位置处形成持久的尖峰，并导致坐标空间中的密度变化非常陡峭。
The relativistic Vlasov equation is integrated numerically in an Eulerian framework in order to investigate the phase space development of the wavebreak of a relativistic Langmuir wave in a thermal plasma. Relativistic kinematic and beam loading effects lead to a “differential retardation” in the time required by the electrons to evolve in phase space, the largest momentum electrons taking the longest time. This leads to the formation of a long lasting spike in momentum space at the wavebreak position that propagates with a velocity close to the speed of light and to an extremely steep density change in coordinate space.