Nonlinear gyrofluid computation of edge localized ideal ballooning modes
Nonlinear gyrofluid computation of edge localized ideal ballooning modes
复制标题
DOI：
10.1063/1.3449807
复制
发表时间：
2010-02
影响因子：
2.2
通讯作者：
A. Kendl;B. Scott;T. Ribeiro
中科院分区：
文献类型：
--
作者：
A. Kendl;B. Scott;T. Ribeiro
本文用三维电磁陀螺流体模拟了托卡马克边缘局域模的理想气球模吹出。特别强调的是放在诊断的线性，过冲和衰减阶段。饱和过程是能量转移到自生边缘湍流，它表现出离子温度梯度模式结构。只有当光谱到达离子回旋半径时，才能发现衰变阶段的收敛。平衡是一个自洽的背景，其演变被考虑在内。边缘层中大约三分之二的总能量在井喷中释放。研究了参数与等离子体压力和离子回旋半径的关系。尽管短暂的过程的暴力性质，过渡到非线性是非常相似的通用托卡马克边缘湍流。
Three-dimensional electromagnetic gyrofluid simulations of the ideal ballooning mode blowout scenario for tokamak edge localized modes are presented. Special emphasis is placed on diagnosis of the linear, overshoot, and decay phases. The saturation process is energy transfer to self-generated edge turbulence, which exhibits an ion temperature gradient mode structure. Convergence in the decay phase is found only if the spectrum reaches the ion gyroradius. The equilibrium is a self-consistent background whose evolution is taken into account. Approximately two-thirds of the total energy in the edge layer is liberated in the blowout. Parameter dependence with respect to plasma pressure and the ion gyroradius is studied. Despite the violent nature of the short-lived process, the transition to nonlinearity is very similar to that found in generic tokamak edge turbulence.