Simulation Study of Relaxation Process in the Finite β Reversed-Field Pinch
Simulation Study of Relaxation Process in the Finite β Reversed-Field Pinch
复制标题
有限β反场箍缩松弛过程的仿真研究
DOI：
10.1143/jpsj.56.963
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发表时间：
1987
影响因子：
1.7
通讯作者：
K. Kusano
中科院分区：
文献类型：
--
作者：
K. Kusano
利用三维磁流体动力学模拟方法，研究了有限β反场箍缩（RFP）中的弛豫过程.结果表明，即使在有限β系统中，非线性重联过程也是RFP弛豫的主要机制。非线性重联率比零β情况下的重联率几乎减半。有限β的松弛状态是动态实现的。该状态具有平坦的压力分布，并且在中心区域中由贝塞尔函数模型很好地近似。模拟结果与部分弛豫态模型一致。根据Suydam准则估计了β极限，发现随着热损失的减小，F-θ图上的稳定区域变窄。
By means of 3D magnetohydrodynamic simulations, the relaxation process in the finite β reversed-field pinch (RFP) is investigated. It is confirmed that the nonlinear reconnection process is the dominant mechanism of the RFP relaxation even in the system of finite β. The nonlinear reconnection rate is almost halved compared with that in the zero β case. The relaxed state of finite β is dynamically achieved. This state has a flat pressure profile and is well approximated by the Bessel-function model in the central region. The simulation result agrees with the partially relaxed state model. The β-limit is estimated based on the Suydam criterion, and consequently, it is found that the stable area on the F-θ diagram is narrowed as the heat loss decreases.