标题： 托卡马克中单位β平衡的稳定性 显示英文标题

标题： The stability of unity beta equilibria in tokamaks

摘要： 等离子体的β值，即动能与磁压的比值，在托卡马克内部应保持低于Troyon极限，以避免主要的等离子体不稳定性。 然而，本文认为Troyon极限仅在电流分布无法维持高β平衡时才会出现。 本文表明，峰值β在单位量级的等离子体对理想MHD模式是稳定的。 尽管单位β平衡的理想-MHD稳定性已经得到解决，但在托卡马克中高β平衡的实验存在仍然是等离子体物理中的一个未解问题。 显示英文摘要

摘要： The plasma beta, ratio of kinetic to magnetic pressure, inside a tokamak should stay below the Troyon limit to avoid major plasma instabilities. However, this paper argues that Troyon limit occurs only when current profiles cannot sustain high beta equilibria. This paper shows that plasmas with peak beta on the order of unity are stable to ideal MHD modes. While the theoretical (ideal-MHD) stability of unity beta equilibrium has been resolved, the experimental existence of high beta equilibria in tokamaks remains an unsolved problem of plasma physics.