用一种新方法观察theta掐位中的等离子体动力学

IF 4.8 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Zhao Wang, Rui Cheng, Guodong Wang, Xuejian Jin, Yong Tang, Yanhong Chen, Zexian Zhou, Lulin Shi, Yuyu Wang, Y. Lei, Xiaoxia Wu, Junliang Yang
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引用次数: 0

摘要

提出了一种新的实验方法,用于观测磁场作用下的等离子体动力学。通过同时测量驱动电流、亮度、等离子体密度、等离子体温度等多个参数的时间分布,为观察theta掐尖的等离子体动力学,如激波输运和磁流体动力学不稳定性提供了依据。我们发现等离子体的演化可以分为三个阶段。首先,在径向内爆阶段,将实验数据与扫雪机模型(Lee模型)相结合,以自洽的方式确定了当前护套和激波的轨迹。其次,在轴向流动阶段,我们证明了与等离子体轴向流动相关的m = 0(香肠)不稳定性抑制了等离子体末端损失。第三,在新观测到的异常加热阶段,低混合漂移不稳定性可能在电流鞘层附近发展,导致异常电阻率和等离子体加热增强。本文的实验数据和新方法有助于更好地理解磁场作用下等离子体动力学,从而为磁惯性聚变的相关研究提供重要支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observation of plasma dynamics in a theta pinch by a novel method
A novel experimental method is proposed for observing plasma dynamics subjected to magnetic fields based on a newly developed cylindrical theta-pinch device. By measuring simultaneously the temporal profiles of multiple parameters including the drive current, luminosity, plasma density, and plasma temperature, it provides a basis for observing the plasma dynamics of the theta pinch, such as shock transport and magnetohydrodynamic instability. We show that the plasma evolution can be distinguished as three phases. First, in the radial implosion phase, the trajectories of the current sheath and shock wave are ascertained by combining experimental data with a snowplow model (Lee model) in a self-consistent way. Second, in the axial flow phase, we demonstrate that m = 0 (sausage) instability associated with the plasma axial flow suppresses the plasma end-loss. Third, in the newly observed anomalous heating phase, the lower-hybrid-drift instability may develop near the current sheath, which induces anomalous resistivity and enhanced plasma heating. The present experimental data and novel method offer better understanding of plasma dynamics in the presence of magnetic fields, thereby providing important support for relevant research in magneto-inertial fusion.
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来源期刊
Matter and Radiation at Extremes
Matter and Radiation at Extremes Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
8.60
自引率
9.80%
发文量
160
审稿时长
15 weeks
期刊介绍: Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.
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