PERPENDICULARLY PROPAGATING PLASMA CYCLOTRON INSTABILITIES SIMULATED WITH A ONE-DIMENSIONAL COMPUTER MODEL.
PERPENDICULARLY PROPAGATING PLASMA CYCLOTRON INSTABILITIES SIMULATED WITH A ONE-DIMENSIONAL COMPUTER MODEL.
复制标题
用一维计算机模型模拟垂直传播等离子体回旋加速器不稳定性。
DOI：
10.1063/1.1693160
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发表时间：
1970
影响因子：
4.6
通讯作者：
M. Grewal
中科院分区：
文献类型：
--
作者：
J. Byers;M. Grewal
用一维计算机模型模拟了速度分布f（ε ε）= δ（ε ε − ε 0）/2π π ε的圆周传播（k ε = 0）回旋不稳定性和具有速度分布的类似损失锥分布。通过以统一的方式加载相空间来创建本质上无噪声的启动条件。从机器的旋转水平开始的增长可以精确地在线性弗拉索夫理论预测下观察到，直到饱和水平，比起始点高出许多数量级。当增长由单个波数主导时，电场的后饱和时间行为由由回旋加速器周期分开的重复出现的峰主导。这导致非线性信号的主要频率分量处于或接近回旋频率的谐波，而不是非谐波的线性真实的频率。后续爆发的振幅衰减缓慢，表明存在准稳定的非线性状态。还观察到非线性不稳定性。...
Perpendicular propagating (k‖ = 0) cyclotron instabilities of velocity distributions f(υ⊥) = δ(υ⊥ − υ0)/2πυ⊥ and similar loss cone distributions with velocity spreads are simulated with a one‐dimensional computer model. Essentially noise‐free starting conditions are created by loading phase space in a uniform way. Growth starting from machine roundoff levels can be observed at precisely the linear Vlasov theory predictions, up to the saturated level, many orders of magnitude above the starting point. When the growth is dominated by a single wavenumber, the post‐saturation time behavior of the electric field is dominated by recurring peaks separated by the cyclotron period. This causes the major frequency components of the nonlinear signal to be at or near harmonics of the cyclotron frequency rather than the linear real frequency, which is nonharmonic. The amplitude of succeeding bursts decays slowly, suggesting the existence of quasistable nonlinear states. A nonlinear instability has also been observed. ...