A new stabilizing regime of tearing mode entrainment in the presence of a static error field
A new stabilizing regime of tearing mode entrainment in the presence of a static error field
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DOI：
10.1088/1741-4326/ab37d2
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发表时间：
2019-08
期刊：
影响因子：
3.3
通讯作者：
M. Okabayashi;S. Inoue;N. Logan;N. Taylor;E. Strait;J. de Grassie;N. Ferraro;J. Hanson;S. Jardin;R. L. La Haye;Y.Q. Liu;C. Paz-Soldan;L. Sugiyama;A. Wingen
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文献类型：
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作者：
M. Okabayashi;S. Inoue;N. Logan;N. Taylor;E. Strait;J. de Grassie;N. Ferraro;J. Hanson;S. Jardin;R. L. La Haye;Y.Q. Liu;C. Paz-Soldan;L. Sugiyama;A. Wingen
轴对称聚变装置中未校正的静态误差场是将目前基于托卡马克的方法推向实际反应堆的为数不多的严重障碍之一。磁流体动力撕裂模式(TM)锁定它们，导致被称为破坏的约束的突然损失。最近，提出了一个假设，即可能存在一个自愈稳定的区域，在该区域中，通过迫使这些TM被施加的非轴对称磁场感应地缓慢旋转，可以有效地屏蔽静态谐振EF(Inoue等人2017年的Nucl。Fusion 57 116020；井上等人2018年血浆。太棒了。控制室。Fusion 60 025003；井上等人2018年预印本：2018年国际原子能机构聚变能源会议。TH/P4-24)。这是基于使用圆柱形单螺旋度模型的非线性、阻性、简化的磁流体力学模拟。在DIII-D装置上的原理验证实验表明，等离子体表面的磁模结构与模拟预测定性一致。然而，径向模式分布显示了本质上不同的行为。这导致了一个修正的假设，即在实际的非圆形环形器件中，当我们考虑多个共振傅立叶分量时，强迫旋转的撕裂层在其他有理表面上诱导了屏蔽过程。径向侵彻的时间演化实验支持这一假说。
Uncorrected static error fields (EFs) in axisymmetric fusion devices are one of the few remaining serious obstacles for advancing the present tokamak-based approach to a practical reactor. Magnetohydrodynamic tearing modes (TMs) lock to them, causing sudden losses of confinement known as disruptions. Recently, a hypothesis has been proposed that there may exist a self-healing stable regime in which a static resonant EF is effectively shielded by forcing these TMs to slowly rotate inductively by the applied non-axisymmetric field (Inoue et al 2017 Nucl. Fusion 57 116020; Inoue et al 2018 Plasma. Phys. Control. Fusion 60 025003; Inoue et al 2018 Preprint: 2018 IAEA Fusion Energy Conf. TH/P4-24). This is based on non-linear, resistive, reduced magnetohydrodynamic simulations using a cylindrical single helicity model. Proof-of-principle experiments in the DIII-D device showed that the magnetic mode structure on the plasma surface is qualitatively consistent with the simulation prediction. However, radial mode profiles revealed qualitatively different behavior. This led to a revised hypothesis that in actual non-circular toroidal devices, a tearing layer in forced rotation induces a shielding process at other rational surfaces when we take into account multiple resonant Fourier components. The time evolution experiment of the radial penetration is supportive of this hypothesis.