Relativistic collisional current-filamentation instability and two-stream instability in dense plasma.
Relativistic collisional current-filamentation instability and two-stream instability in dense plasma.
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DOI：
10.1103/physreve.79.046409
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发表时间：
2009-04
期刊：
影响因子：
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通讯作者：
B. Hao;Z. Sheng;C. Ren;J. Zhang
中科院分区：
文献类型：
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作者：
B. Hao;Z. Sheng;C. Ren;J. Zhang
研究了碰撞对以相对论性强电子束穿透冷致密等离子体的电流-丝化不稳定性（CFI）和双流不稳定性（TSI）的影响。结果表明，随着背景等离子体与光束密度比的增大，CFI模式的增长速率先衰减后增强。同时，由于体等离子体密度的增加和碰撞效应的影响，CFI的最大生长速率向长波区偏移，形成更大的细丝。另一方面，碰撞效应主要是使TSI衰减并最终趋于稳定。给出了接近快燃情景（FIS）参数下的数值解，结果表明，在致密区，CFI的生长速度不是被抑制，而是被提高了2个数量级。因此，cfi诱导的电子细丝形成和由此产生的动力学异常加热对FIS中的目标加热具有潜在的重要意义。
The collisional effects on the current-filamentation instability (CFI) and the two-stream instability (TSI), which appear as a relativistic intense electron beam penetrating into a cold dense plasma, are investigated. It is shown that the growth rate of the CFI mode is first attenuated and then enhanced by the collisional effects as the density ratio of the background plasma to the beam increases. Meanwhile, the maximum CFI growth rate is shifted to the long-wavelength region due to both the bulk plasma density increase and the collisional effects, resulting in larger filaments formation. On the other hand, collisional effects mainly attenuate the TSI and finally stabilize it. Numerical solutions under parameters close to the fast ignition scenario (FIS) are given, which show that the CFI growth rate can be enhanced by 2 orders of magnitude instead of being suppressed in the dense region. Therefore, the CFI-induced electron filaments formation and the resultant kinetic anomalous heating are potentially significant for the target heating in the FIS.