Nondissipative kinetic simulation and analytical solution of three-mode equations of the ion temperature gradient instability
Nondissipative kinetic simulation and analytical solution of three-mode equations of the ion temperature gradient instability
复制标题
离子温度梯度不稳定性三模态方程的非耗散动力学模拟与解析解
DOI：
10.1063/1.873897
复制
发表时间：
1999
影响因子：
2.2
通讯作者：
T. Sato
中科院分区：
文献类型：
--
作者：
T. Watanabe;H. Sugama;T. Sato
A nondissipative drift kinetic simulation scheme, which rigorously satisfies the time-reversibility, is applied to the three-mode coupling problem of the ion temperature gradient (ITG) instability. It is found from the simulation that the three-mode ITG system repeats growth and decay with a period which shows a logarithmic divergence for infinitesimal initial perturbations. Accordingly, time average of the mode amplitude vanishes, as the initial amplitude approaches zero. An exact solution is analytically given for a class of initial conditions. An excellent agreement is confirmed between the analytical solution and numerical results. The results obtained here provide a useful reference for basic benchmarking of theories and simulations of the ITG modes.
