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Newly uncovered physics of MHD instabilities using 2-D electron cyclotron emission imaging system in toroidal plasmas
Advances in Physics: X ( IF 7.7 ) Pub Date : 2019-07-20 , DOI: 10.1080/23746149.2019.1633956
Hyeon K. Park 1
Affiliation  

Validation of physics models using the newly uncovered physics with a 2-D electron cyclotron emission imaging (ECEi) system for magnetic fusion plasmas has either enhanced the confidence or substantially improved the modeling capability. The discarded “full reconnection model” in sawtooth instability is vindicated and established that symmetry and magnetic shear of the 1/1 kink mode are critical parameters in sawtooth instability. For the 2/1 instability, it is demonstrated that the 2-D data can determine critical physics parameters with a high confidence and the measured anisotropic distribution of the turbulence and its flow in presence of the 2/1 island is validated by the modelled potential and gyro-kinetic calculation. The validation process of the measured reversed-shear Alfvéneigenmode (RSAE) structures has improved deficiencies of prior models. The 2-D images of internal structure of the ELMs and turbulence induced by the resonant magnetic perturbation (RMP) have provided an opportunity to establish firm physics basis of the ELM instability and role of RMPs. The importance of symmetry in determining the reconnection time scale and role of magnetic shear of the 1/1 kink mode in sawtooth instability may be relevant to the underlying physics of the violent kink instability of the filament ropes in a solar flare.



中文翻译:

在环形等离子体中使用二维电子回旋加速器发射成像系统新发现的MHD不稳定性物理学

使用新发现的物理学与用于磁聚变等离子体的二维电子回旋加速器发射成像(ECEi)系统对物理学模型进行验证,既可以增强置信度,也可以大大改善建模能力。证明了舍弃的锯齿不稳定性“完全重新连接模型”,并确定了1/1 扭结模式的对称性和磁切变是 锯齿不稳定性的关键参数。对于 2/1的 不稳定性,证明了2D数据可以高置信度确定关键的物理参数,并且在2/1的存在下测得的湍流及其流动的各向异性分布  通过建模的电势和陀螺动力学计算验证了该岛。实测反向剪切Alfvéneigenmode(RSAE)结构的验证过程改善了先前模型的缺陷。ELM内部结构和共振磁扰动(RMP)引起的湍流的二维图像为建立ELM不稳定性和RMP作用的牢固的物理基础提供了机会。在确定重新连接的时间尺度上对称性的重要性以及1/1 扭结模式的磁剪切 在锯齿不稳定性中的作用可能与日光耀斑中长丝绳的剧烈扭结不稳定性的基本物理原理有关。

更新日期:2019-07-20
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