论文标题
Heliotron等离子体平衡β极限的理论研究
Theoretical studies of equilibrium beta limit in heliotron plasmas
论文作者
论文摘要
在这项研究中，使用3D MHD平衡计算代码提示对LHD等离子体的MHD平衡极限进行了研究，这是基于弛豫方法的初始值求解器，而无需假设嵌套通量表面。对于有限的β均衡，通量表面在外围区域变得随机。但是，尽管轴移动到常规极限，但分离质量限制了平衡。对于高β均衡，力平衡开始在随机区域中破裂。为了保持力平衡，随机区域中的压力梯度减小，固定轮廓降低。结果，体积平均β饱和。 beta值的力平衡开始在随机区域内破裂，提出是Heliotron等离子体中平衡β极限的指数。
In this study, the MHD equilibrium limit of LHD plasmas is studied using a 3D MHD equilibrium calculation code, HINT, which is an initial value solver based on the relaxation method without the assumption of nested flux surfaces. For finite beta equilibria, flux surfaces become stochastic in the peripheral region. However, though the axis shifts until the conventional limit, the separatrix to limit the equilibrium does not appear. For high beta equilibria, the force balance starts breaking in the stochastic region. To keep the force balance, the pressure gradient in the stochastic region decreases and the fixed profile is reduced. As the result, the volume averaged beta saturates. The beta value, where the force balance starts breaking inside the stochastic region, is proposed as an index of equilibrium beta limit in heliotron plasmas.
