The magnetized anisotropic ion apparatus (MARIA) was constructed to study the density buildup and particle balance in helicon plasmas. This device will help address key questions surrounding the dynamics of the neutral argon population and the role it plays in defining the ultimate density achieved. Insights gained from this research are particularly important for meeting the demanding high density and high uniformity requirements of plasma based wakefield accelerator concepts. A key feature of the MARIA device is it is fully transparent borosilicate glass chamber which enables the flexible use and development of optical techniques for measuring plasma parameters like electron temperature and density. Whistler-mode behavior featuring very high on-axis ionization fraction and a linear relationship between electron density and magnetic field strength up to 5 × 10 18 m −3 has been measured with an RF compensated Langmuir probe in argon with 700 W RF power, 650 G...

中文翻译：

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用于研究与等离子体-尾波场加速器有关的螺旋等离子体的线性等离子体装置的构造

构造了磁化各向异性离子装置（MARIA），以研究螺旋等离子体中的密度累积和粒子平衡。该设备将帮助解决围绕中性氩气种群动态及其在定义所达到的最终密度中所起的作用的关键问题。从这项研究中获得的见解对于满足基于等离子体的尾波场加速器概念的高密度和高均匀性要求特别重要。MARIA设备的主要特点是它是完全透明的硼硅酸盐玻璃腔室，它可以灵活地使用和开发用于测量等离子体参数（如电子温度和密度）的光学技术。