NON-RESONANT GLOBAL MODE IN LHD PARTIAL COLLAPSE WITH NET TOROIDAL CURRENT
NON-RESONANT GLOBAL MODE IN LHD PARTIAL COLLAPSE WITH NET TOROIDAL CURRENT
复制标题
LHD 部分崩溃且净环形电流下的非谐振全局模式
DOI：
10.1088/1741-4326/ac3292
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发表时间：
2021
期刊：
影响因子：
3.3
通讯作者：
L.E. Sugiyama and B.A. Carreras
中科院分区：
文献类型：
--
作者：
K. Ichiguchi;Y. Suzuki;Y. Todo;S. Sakakibara;K. Ida;Y. Takemura;M. Sato ;L.E. Sugiyama and B.A. Carreras
在具有净环向电流的大螺旋装置（LHD）等离子体局部坍缩的非线性磁流体动力学模拟中，发现了从交换模式到非共振模式的转变。当磁剪切较弱，核心区的旋转变换接近统一时，就会发生这种转变。在这种转变中，傅里叶主分量的模态数减少了。由于非线性演化，(m, n)=(1,1)分量可以占主导地位，其中m和n分别为极向和环向模态数。这种转变被认为是解释LHD实验中观察到的净环向电流显示部分坍塌是由（1,1）模式引起的一个候选。
A transition from an interchange mode to a non-resonant mode is found in the nonlinear magnetohydrodynamic simulation for the partial collapse in a large helical device (LHD) plasma with a net toroidal current. This transition can occur when the magnetic shear is weak and the rotational transform is close to unity in the core region. In this transition, the mode number of the dominant Fourier component is reduced. As a result of the nonlinear evolution, the (m, n)=(1, 1) component can be dominant, where m and n are the poloidal and the toroidal mode numbers, respectively. This transition is considered to be a candidate to explain the observation in the LHD experiments with the net toroidal current that show partial collapses are caused by the (1, 1) mode.