Improved plasma confinement at high beta
Improved plasma confinement at high beta
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改善高贝塔值下的等离子体限制
DOI：
10.1063/1.4964157
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发表时间：
2016
影响因子：
0.9
通讯作者：
A. Beklemishev
中科院分区：
文献类型：
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作者：
A. Beklemishev
提出了一种用于线性阱的有效约束新方法。在高β的线性阱中，等离子体平衡可以演化成一种内部具有非常小磁场的抗磁性“气泡”。如果陷阱的真空磁场在其最小值附近具有准均匀的拉伸，则具有非旁轴末端的大致圆柱形的“气泡”将恰好占据这一拉伸。“气泡”半径由粒子通量和能量通量的平衡决定，而力平衡对应于任意半径处的β≈1。在这种抗磁状态下，陷阱的有效镜像比可以变得非常大，抑制轴向损耗，但其内部的跨场输运增加。总约束时间可以从平衡方程组和输运方程的解中得到，并显示为τ e≈τ‖τ⊥。这意味着高β的抗磁约束允许构建相对较短的线性陷阱作为聚变反应堆。
A new efficient method of confinement is proposed for use in linear traps. The plasma equilibrium in a linear trap at high β can evolve into a kind of diamagnetic “bubble” with a very small field inside. If the vacuum magnetic field of the trap has a quasi-uniform stretch near its minimum, the roughly cylindrical “bubble” with non-paraxial ends will occupy just this stretch. The “bubble” radius is determined by the balance of particle and energy fluxes, while the force balance corresponds to β ≈ 1 at any radius. The effective mirror ratio of the trap in this diamagnetic regime can become very large, stifling the axial losses, but the cross-field transport inside it increases. The total confinement time can be found from solution of the system of equilibrium and transport equations and is shown to be τE≈τ‖τ⊥. This means that the diamagnetic confinement at high β allows construction of relatively short linear traps as fusion reactors.