Qi Lei
Korea Institute of Fusion Energy, Daejeon, 169-148, South Korea.
Sci Rep. 2022 Mar 23;12(1):5042. doi: 10.1038/s41598-022-08932-4.
The first principle gyrokinetic simulations of trapped electron turbulence in tokamak fusion plasmas demonstrate the energy transfers from the most linearly unstable modes at high [Formula: see text] to intermediate [Formula: see text] via parametric decay process in a short period of linear-nonlinear transition phase. Dominant nonlinear wave-wave interactions occur near the mode rational surface [Formula: see text]. In fully nonlinear turbulence, inverse energy cascade occurs between a cutoff wave number [Formula: see text] and [Formula: see text] with a power law scaling [Formula: see text], while modes with [Formula: see text] are suppressed. The numerical findings show fair agreement with both the weak turbulence theory and realistic experiments on Tore Supra tokamak.
托卡马克聚变等离子体中捕获电子湍流的首次原理陀螺动力学模拟表明，在短时间的线性 - 非线性过渡阶段，能量通过参量衰变过程从高[公式：见原文]处最线性不稳定的模式转移到中间[公式：见原文]处。主要的非线性波 - 波相互作用发生在模式有理面[公式：见原文]附近。在完全非线性湍流中，在截止波数[公式：见原文]和[公式：见原文]之间发生逆能量级串，具有幂律标度[公式：见原文]，而[公式：见原文]的模式受到抑制。数值结果与弱湍流理论以及托雷 - 苏普拉托卡马克上的实际实验都有较好的一致性。
