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arXiv 1206.2373physics.plasm-ph
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无外力矩时托卡马克等离子体脱离力学平衡的旋转

Rotation of Tokamak-Plasmas out of Mechanical Equilibria, in Absence of External Torques

Giorgio Sonnino, Alessandro Cardinali, Alberto Sonnino, Fulvio Zonca

摘要:

利用Prigogine建立的热力学定理,研究了托卡马克等离子体的旋转,而不是在机械平衡。这个定理,适用于环形约束等离子体,表明全球重心旋转的等离子体,在环向和极向方向,是纯粹的可逆过程。在粘性可以忽略不计的情况下,通过假设内力平衡方程的有效性,我们证明了等离子体,即使不处于力学平衡,也可以作为一个刚体在环向自由旋转,其角频率为,其角频率可能高于新古典估计。此外,它的环向旋转可能导致等离子体在极向方向上以比新经典理论所发现的表达式更快的速度全局旋转。当环向和极向角频率达到使耗散最小的值时,获得最终的配置。

英文摘要:

Rotation of tokamak-plasmas, not at the mechanical equilibrium, is investigated utilizing a theorem of thermodynamics, established by Prigogine. This theorem, suitably applied to toroidally confined plasmas, suggests that the global barycentric rotations of the plasma, in the toroidal and poloidal directions, are pure reversible processes. In case of negligible viscosity and by supposing the validity of the balance equation for the internal forces, we show that the plasma, even not in the mechanical equilibrium, may freely rotate as a rigid body in the toroidal direction with an angular frequency with an angular frequency, which may be higher than the neoclassical estimation. In addition, its toroidal rotation may cause the plasma to rotate globally in the poloidal direction at a speed faster than the expression found by the neoclassical theory. The eventual configuration is attained when the toroidal and poloidal angular frequencies reaches the values that minimize dissipation.

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