Toroidal Alfvén mode instability driven by plasma current in low-density Ohmic plasmas of the spherical tori

IF 2 3区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Physics of Plasmas Pub Date : 2024-09-20 DOI:10.1063/5.0223920
V. S. Marchenko, S. N. Reznik
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Abstract

Due to intrinsically low magnetic fields, at low density the drift speed of the current-carrying electrons in spherical tokamaks can exceed fraction of the Alfvén speed sufficient for the excitation of the Alfvén gap modes. A particular case of the toroidal mode, observed during minor disruptions in Ohmic shots on SUNIST [Liu et al., Phys. Plasmas 23, 120706 (2016)], is considered in the present communication. Due to the negligible effect of the electron pressure gradient, the growth rate scales linearly with the drift speed, with slope inversely proportional to electron thermal velocity. In the absence of continuum damping, the threshold value of the drift speed for TAE excitation is independent of electron temperature.
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球形环状低密度欧姆等离子体中等离子电流驱动的环状阿尔弗芬模式不稳定性
由于固有的低磁场,在低密度情况下,球形托卡马克中载流电子的漂移速度可能会超过阿尔弗韦恩速度的一部分,足以激发阿尔弗韦恩间隙模式。本研究考虑了在 SUNIST 上欧姆射中轻微中断时观测到的环形模式的一个特殊案例[Liu 等人,Phys. Plasmas 23, 120706 (2016)]。由于电子压力梯度的影响可以忽略不计,增长率与漂移速度成线性比例,斜率与电子热速度成反比。在没有连续阻尼的情况下,TAE 激发的漂移速度阈值与电子温度无关。
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来源期刊
Physics of Plasmas
Physics of Plasmas 物理-物理:流体与等离子体
CiteScore
4.10
自引率
22.70%
发文量
653
审稿时长
2.5 months
期刊介绍: Physics of Plasmas (PoP), published by AIP Publishing in cooperation with the APS Division of Plasma Physics, is committed to the publication of original research in all areas of experimental and theoretical plasma physics. PoP publishes comprehensive and in-depth review manuscripts covering important areas of study and Special Topics highlighting new and cutting-edge developments in plasma physics. Every year a special issue publishes the invited and review papers from the most recent meeting of the APS Division of Plasma Physics. PoP covers a broad range of important research in this dynamic field, including: -Basic plasma phenomena, waves, instabilities -Nonlinear phenomena, turbulence, transport -Magnetically confined plasmas, heating, confinement -Inertially confined plasmas, high-energy density plasma science, warm dense matter -Ionospheric, solar-system, and astrophysical plasmas -Lasers, particle beams, accelerators, radiation generation -Radiation emission, absorption, and transport -Low-temperature plasmas, plasma applications, plasma sources, sheaths -Dusty plasmas
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