Collisional effects on the relativistic current-filamentation instability in dense plasmas

被引：5
|
作者：
Hao, B. [1 ]
Sheng, Z. M. [2 ,3 ]
Zhang, J. [1 ,2 ,3 ]
Li, Y. T. [1 ]
机构：
[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China
[2] Shanghai Jiao Tong Univ, Minist Educ, Key Lab Laser Plasmas, Shanghai 200030, Peoples R China
[3] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200030, Peoples R China
来源：
LASER AND PARTICLE BEAMS | 2014年 / 32卷 / 01期
基金：
美国国家科学基金会;
关键词：
Filamentation instability; Relativistic electron beam; Dense plasma; Collisional effect; LASER-MATTER INTERACTION; ELECTRON-TRANSPORT; WEIBEL INSTABILITY; FAST-IGNITION; STATISTICAL MECHANICS; MAGNETIC-FIELDS; BEAM; PULSES; TEMPERATURE; GENERATION;
D O I：
10.1017/S0263034613000803
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Collisional effects on the current-filamentation instability (CFI), accounting for the space charge effect (SCE), are investigated kinetically for a relativistic beam propagating in dense plasmas. It is shown that collisions can completely suppress the SCE in low temperature dense plasma, leading to enhancement of the CFI. This kind of decoupling mechanism is quite different from the well-known resistive mechanism [Molvig (1975). Phys. Rev. Lett. 35, 1504]. In particular, we find the present decoupling mechanism can well explain the recent numerical simulation results [Karmakar et al. (2008). Phys. Rev. Lett. doi: 101, 255001]. In the parameter regime related to the laser-solid interaction and fast ignition scenario (FIS), the CFI growth rate with SCE included is enhanced in the low plasma density region through the decoupling mechanism. In the high plasma density region, it is enhanced mainly through the resistive mechanism.
引用
收藏
页码：79 / 88
页数：10
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