Guo H Y, Hoffman A L, Steinhauer L C, Miller K E, Milroy R D
Redmond Plasma Physics Laboratory, University of Washington, Seattle, Washington 98195, USA.
Phys Rev Lett. 2006 Dec 8;97(23):235002. doi: 10.1103/PhysRevLett.97.235002. Epub 2006 Dec 6.
Evidence of relaxation has appeared, for the first time, in the extremely high-beta, steady-state field-reversed configuration plasma states driven by rotating magnetic fields (RMF) in the translation, confinement, and sustainment experiment. The plasma self-organizes into a near-force-free state in the vicinity of the magnetic axis, with significant improvement in confinement. Associated with this change in magnetic topology is the appearance of an axial RMF component; this would, in turn, generate a current drive in the poloidal direction, thus sustaining the magnetic helicity. A newly developed two-dimensional "equilibrium-lite" model is employed to analyze the magnetic properties of the final high-confinement state, and shows a large q and a significant magnetic shear in the core.
在平移、约束和维持实验中，由旋转磁场（RMF）驱动的极高β值稳态场反转构型等离子体状态下，首次出现了弛豫迹象。等离子体在磁轴附近自组织成近无力状态，约束性能显著改善。与这种磁拓扑结构的变化相关的是轴向RMF分量的出现；这反过来又会在极向方向产生电流驱动，从而维持磁螺旋度。采用新开发的二维“简化平衡”模型来分析最终高约束状态的磁特性，结果表明核心区域具有较大的q值和显著的磁剪切。
