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Single helicity: a new paradigm for the reversed field pinch

机译：单一螺旋度：反向场收缩的新范例

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The reversed held pinch (RFP) is a configuration for magnetic confinement akin to the tokamak, but its toroidal field has an amplitude comparable to the poloidal one, and reverses in the outer region. Recent progress in experiments and theory open a path beyond the standard paradigm that a bath of magnetic turbulence is intrinsic to the RFP. In RFX, the largest present RFP experiment, the existence of plasma states with a hot helical core has been proven by soft x-ray tomography. Such states have been seen transiently in several RFPs, but also permanently in discharges in RFX. This last fact makes these states germane to the stationary single-helicity (SH) states displayed by three-dimensional visco-resistive MHD simulations. These simulations also display multiple-helicity (MW) states whose features, in particular magnetic chaos, are analogous to the traditional turbulent state of RFP plasmas. The numerical MH states bifurcate to SH ones when the product (viscosity x resistivity) is increased. The SH states correspond to an integrable magnetic field with good flux surfaces, a feature favourable to good confinement. SH states are not Taylor states, but they may be viewed as the nonlinear state of a resistive kink mode stabilized by the toroidal field reversal. [References: 42]
机译：反向夹持收缩（RFP）是一种类似于托卡马克的磁性约束结构，但其环形磁场的振幅可与极向电场相媲美，并且在外部区域反向。实验和理论上的最新进展开辟了一条超越标准范式的道路，即RFP固有的是湍流浴。在目前最大的RFP实验RFX中，软X射线断层扫描已证明存在具有热螺旋芯的等离子体状态。这种状态在几个RFP中都是短暂可见的，但在RFX中的放电中也永久可见。这最后一个事实使这些状态与三维抗粘MHD仿真显示的静态单螺旋（SH）状态紧密相关。这些模拟还显示了多螺旋（MW）状态，其特征（特别是磁混沌）类似于RFP等离子体的传统湍流状态。当乘积（粘度x电阻率）增加时，数字MH状态分叉成SH状态。 SH状态对应于具有良好磁通表面的可积分磁场，这是有利于良好约束的特征。 SH状态不是泰勒状态，但可以将其视为通过环形场反转稳定的电阻扭结模式的非线性状态。 [参考：42]

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