通过磁声波速度测量确定的实验等离子体密度分布
Experimental Plasma Density Profiles Determined Through Measurements of the Magnetosonic Wave Speed
- University of Wisconsin-Madison（威斯康星大学麦迪逊分校）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出利用重联驱动产生的快磁声波波前传播特性，结合已知磁场与色散关系，通过磁性测量推断实验室等离子体初始密度分布的新方法。
AI中文摘要：
实验室等离子体中的等离子体密度信息通常通过朗缪尔探针或光学诊断获得。在此，我们提出一种替代方法，即从等离子体波的磁性测量中推断密度分布。具体而言，在Big Red Ball装置中为磁重联实验创建重联电流层的过程中，重联驱动首先发射一个大幅值的快磁声波。通过原位磁性诊断，以高空间和时间分辨率测量波前的传播。在已知均匀背景磁场强度和波的已知色散关系的情况下，我们在此展示如何利用波前的特征来确定初始等离子体密度分布。
英文摘要：
Information on plasma density in laboratory plasmas is commonly acquired using either Langmuir probes or optical diagnostics. Here, we present an alternative approach, inferring the density profile from magnetic measurements of a plasma wave. In particular, during the process of creating a reconnecting current layer for magnetic reconnection experiments in the Big Red Ball, the reconnection drive first launches a large amplitude fast magnetosonic wave. The propagation of the wavefront is measured with high spatial and temporal resolutions by in situ magnetic diagnostics. Given a known uniform background magnetic field strength and the known dispersion relation of the wave, we here show how the characteristics of the wavefront can be applied to determine the initial plasma density profile.
