离子运动对纵向相对论强等离子体波破碎的影响：Khachatryan 模式再考察
Effect of Ion Motion on Breaking of Longitudinal Relativistically Strong Plasma Waves: Khachatryan mode revisited
AI总结：
本文通过一维流体模拟研究离子运动对相对论强空间电荷波演化的影响，发现 Khachatryan 模式会因相位混合而在远低于理论破碎极限的振幅下破碎，且破碎时间与波能量密度成反比。
摘要：
本文利用一维流体模拟程序，研究了离子运动对相对论强空间电荷波时空演化的影响。在我们的模拟中，这些波是在刚性电子束穿过冷均匀等离子体并以接近光速传播时，在其尾流中激发的。观测到激发波是 Khachatryan [Phys. Rev. E 58, 7799 (1998)] 所描述的一种模式，其剖面逐渐变陡，并在经历数个等离子体周期后最终破碎，表现出爆发性行为。研究发现，破碎发生在远低于 Khachatryan [Phys. Rev. E 58, 7799 (1998)] 解析推导的破碎极限的振幅处。这种在远低于破碎极限的振幅下发生波破碎的现象，可以通过激发波的相位混合来理解。进一步发现，相位混合时间（波破碎时间）与波的能量密度成反比。
英文摘要：
Effect of ion motion on the spatio-temporal evolution of a relativistically strong space charge wave, is studied using a 1-D fluid simulation code. In our simulation, these waves are excited in the wake of a rigid electron beam propagating through a cold homogeneous plasma with a speed close to the speed of light. It is observed that the excited wave is a mode as described by Khachatryan [Phys. Rev. E 58, 7799 (1998)] whose profile gradually sharpens and the wave eventually breaks after several plasma periods exhibiting explosive behaviour. It is found that breaking occurs at amplitudes, which is far below the breaking limit analytically derived by Khachatryan [Phys. Rev. E 58, 7799 (1998)]. This phenomenon of wave breaking, at amplitudes well below the breaking limit, is understood in terms of phase mixing of the excited wave. It is further found that the phase mixing time (wave breaking time) scales inversely with the energy density of the wave.
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