Use of differential plasma rotation to prevent disruptive tearing mode onset from 3-wave coupling

IF 3.5 1区物理与天体物理 Q1 PHYSICS, FLUIDS & PLASMAS

Nuclear Fusion Pub Date : 2024-09-03 DOI:10.1088/1741-4326/ad7273

N.J. Richner, L. Bardóczi, J.D. Callen, R.J. La Haye, N.C. Logan, E.J. Strait

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引用次数: 0

Abstract

Plasma differential rotation is found to be capable of preventing disruptive neoclassical tearing modes (NTMs) seeded by nonlinear three-wave coupling. As tearing modes degrade confinement and can lead to disruptions, stabilization strategies are crucial to the successful operation of future devices. In ITER-relevant scenarios on DIII-D, rotationally coupled

m/n

= 1/1 and 3/2 modes have been observed to drive 2/1 islands through three-wave coupling. The frequency of the driven 2/1 mode is set by matching conditions and the frequencies of the driving modes. When the driven mode frequency matches the local plasma rotation frequency, e.g. at low differential rotation, the driven 2/1 island can grow into a disruptive NTM. Using neutral beam torque as an actuator to scan the differential rotation, these experiments demonstrate that a sufficiently large frequency mismatch prevents destabilization of disruptive 2/1 NTMs by three-wave coupling. This work indicates that differential rotation can be used as an actuator to prevent NTMs seeded by three-wave coupling.

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利用差分等离子体旋转防止 3 波耦合产生破坏性撕裂模式

研究发现，等离子体差分旋转能够防止由非线性三波耦合引发的破坏性新经典撕裂模式（NTMs）。由于撕裂模会降低约束性并导致破坏，因此稳定策略对于未来装置的成功运行至关重要。在 DIII-D 上的热核实验堆相关场景中，已经观察到旋转耦合 m/n = 1/1 和 3/2 模式通过三波耦合驱动 2/1 岛。驱动 2/1 模式的频率由匹配条件和驱动模式的频率决定。当驱动模式的频率与局部等离子体旋转频率相匹配时，例如在低差分旋转时，驱动的 2/1 岛可以发展成为破坏性的非晶态物质。这些实验利用中性束扭矩作为扫描差分旋转的致动器，证明足够大的频率失配可以防止三波耦合破坏性 2/1 非晶态金属的稳定性。这项工作表明，差分旋转可作为一种致动器，用于防止三波耦合产生非晶态种子。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Fusion 物理-物理：核物理

CiteScore

6.30

自引率

39.40%

发文量

411

审稿时长

2.6 months

期刊介绍： Nuclear Fusion publishes articles making significant advances to the field of controlled thermonuclear fusion. The journal scope includes: -the production, heating and confinement of high temperature plasmas; -the physical properties of such plasmas; -the experimental or theoretical methods of exploring or explaining them; -fusion reactor physics; -reactor concepts; and -fusion technologies. The journal has a dedicated Associate Editor for inertial confinement fusion.