Effects of the background plasma temperature on the current filamentation instability

Jia, Qing; Cai, Hong-bo; Wang, Wei-wu; Zhu, Shao-ping; Sheng, Z. M.; He, X. T.
March 2013
Physics of Plasmas;Mar2013, Vol. 20 Issue 3, p032113
Academic Journal
The effects of thermal anisotropy of background plasma on the current-filamentation instability (CFI) in an asymmetric counterstreaming system are investigated with a fully relativistic kinetic model. It is found that both the temperature and the thermal anisotropy of the background plasma play important roles in the development of the CFI. It is also pointed out that the thermal anisotropy of the background plasma dominates over the space charge effect in suppressing the CFI. A parametric study of the CFI is presented in the context of fast ignition. A new way to suppress CFI and its detrimental effects on the fast electron beam divergence has been proposed. The results of the analytical estimations are verified by 2D3V particle-in-cell simulations.


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