Spontaneous hole-clump pair creation in weakly unstable plasmas
Spontaneous hole-clump pair creation in weakly unstable plasmas
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DOI：
10.1016/s0375-9601(97)00523-9
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发表时间：
1997-09-22
影响因子：
2.6
通讯作者：
Petviashvili, NV
中科院分区：
文献类型：
--
作者：
Berk, HL;Breizman, BN;Petviashvili, NV
数值模拟的动力学不稳定性阈值附近显示了一个洞和团块自发出现在粒子分布函数。孔和块支持一对伯恩斯坦，格林，克鲁斯卡尔（BGK）的非线性波，持续时间远长于线性阻尼率的倒数，而他们在频率上移和下移。频移允许从共振粒子非线性提取的功率与耗散到背景等离子体中的功率之间的平衡。这些波最终由于碰撞引起的相空间梯度平滑而衰减。(C)1997年Elsevier Science B.V.
A numerical simulation of a kinetic instability near threshold shows how a hole and clump spontaneously appear in the particle distribution function. The hole and clump support a pair of Bernstein, Greene, Kruskal (BGK) nonlinear waves that last much longer than the inverse linear damping rate while they are upshifting and downshifting in frequency. The frequency shifting allows a balance between the power nonlinearly extracted from the resonant particles and the power dissipated into the background plasma. These waves eventually decay due to phase space gradient smoothing caused by collisionality. (C) 1997 Elsevier Science B.V.