Construction of a linear plasma device for studying helicon plasmas relevant to plasma-wakefield accelerators
Construction of a linear plasma device for studying helicon plasmas relevant to plasma-wakefield accelerators
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DOI：
10.1088/1361-6595/ab7852
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发表时间：
2020-04
影响因子：
3.8
通讯作者：
J. Green;O. Schmitz
中科院分区：
文献类型：
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作者：
J. Green;O. Schmitz
建立了磁化各向异性离子装置（MARIA），用于研究螺旋等离子体中的密度建立和粒子平衡。该装置将有助于解决围绕中性氩种群动态及其在定义最终密度方面所起作用的关键问题。从这项研究中获得的见解是特别重要的，以满足等离子体为基础的韦克菲尔德加速器的概念，要求高密度和高均匀性的要求。MARIA设备的一个关键特征是它是完全透明的硼硅酸盐玻璃腔室，可以灵活使用和开发光学技术来测量等离子体参数，如电子温度和密度。哨声模式行为具有非常高的轴上电离分数和电子密度和磁场强度之间的线性关系高达5 × 1018 m−3已被测量与RF补偿朗缪尔探针在氩气与700 W的RF功率，650 G的天线，和2 mTorr的中性压力。建立在朗缪尔探针测量基础上的激光诱导荧光测量能够通过使离子和中性源和汇能够空间分辨来完全约束2D粒子平衡。在轴向方向上的初始流速测量。
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 × 1018 m−3 has been measured with an RF compensated Langmuir probe in argon with 700 W RF power, 650 G at the antenna, and 2 mTorr neutral pressure. Laser induced fluorescence measurements, which build on the Langmuir probe measurements, are able to fully constrain the 2D particle balance by enabling ion and neutral sources and sinks to be spatially resolved. Initial flow velocity measurements in the axial direction are presented.