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RFX-mod: A multi-configuration fusion facility for three-dimensional physics studies

机译:RFX-mod:用于三维物理研究的多配置融合设备

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摘要

RFX-mod [Sonato, Fusion Eng. Des. 66, 161 (2003)] exploits its 192 active coils in both reversed-field pinch (RFP) and tokamak configurations with varying degrees of 3D shaping, providing also a test bed for validating stellarator codes and 3D nonlinear magnetohydrodynamic codes. This makes RFX-mod a unique and flexible facility for comparative studies on 3D shaping and control. The paper discusses how 3D fields allow access to RFP and tokamak advanced regimes. 3D fields are used to feedback control Single Helicity (SH) RFP equilibria with 1/7 helicity up to ~ 2 MA. They also allow accessing SH regimes with higher density (Greenwald fraction up to 0.5), presently inaccessible in spontaneous SH regimes. Feedback on the 2/1 resistive-wall mode in RFX-mod tokamak plasmas allows for safe operation at q (a) < 2, an almost unexplored promising regime. Forcing the 2/1 mode to saturate at finite but small level, a helical tokamak equilibrium with significant n = 1 modulation is produced and a new way to tailor sawteeth is found. The effects of different levels of 3D shaping on momentum transport in both RFP and tokamak helical states are discussed.
机译:RFX-mod [Sonato,Fusion Eng。德斯66,161(2003)]利用其192个有源线圈在反向磁场收缩(RFP)和托卡马克配置中使用了不同程度的3D成形,还提供了一个用于验证恒星代码和3D非线性磁流体动力学代码的测试台。这使得RFX-mod成为用于3D成形和控制比较研究的独特而灵活的工具。本文讨论了3D场如何允许访问RFP和tokamak高级方案。 3D字段用于反馈控制单螺旋(SH)RFP平衡,具有高达〜2 MA的1/7螺旋。它们还允许访问具有更高密度(格林瓦尔德分数最高为0.5)的SH模式,目前在自发SH模式中无法访问。在RFX-mod托卡马克等离子体中对2/1电阻壁模式的反馈允许在q(a)<2的情况下安全运行,这是一种几乎未开发的有希望的方案。迫使2/1模式在有限但很小的水平上饱和,产生了具有明显n = 1调制的螺旋托卡马克平衡,并且找到了一种定制锯齿的新方法。讨论了在RFP和托卡马克螺旋状态下,不同水平的3D成形对动量传递的影响。

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