VUV信号强度与等离子体宏观参数相关性分析

东方超环(EAST)上高速真空紫外(VUV)成像系统是一套选择性测量中心波长为13.5 nm的等离子体线辐射的光学成像系统。此系统具有高时空分辨能力，主要用于边界(包括台基区)等离子体行为研究。该系统已经投入EAST等离子体物理实验并获得了大量的实验数据。基于这些数据，分析了VUV诊断系统的信号强度与等离子体宏观参数之间的相关性，着重研究了EAST上中性束注入(NBI)加热功率、杂质(碳和锂)水平、电子密度等因素对VUV信号强度的影响。结果与预期基本一致:随着NBI功率的增加，VUV信号强度随之增强；VUV信号强度与电子密度、杂质水平呈现线性关系。此外，本文还评估了由于NBI注入引起的电荷交换复合产生的C5+离子对VUV信号的贡献，结果表明这部分贡献可以忽略不计。

Correlation of VUV intensity and basic plasma parameters

The high-speed vacuum ultraviolet (VUV) imaging system on the Experimental Advanced Superconducting Tokamak (EAST) is an optic system with both high temporal and spatial resolutions, and it can selectively measure VUV photons with a wavelength of 13.5 nm, which mainly come from the impurities line emission from the plasma. It is being developed for edge plasma studies and has been operated routinely during the 2016 EAST experiment campaign. In this work, effect on the VUV intensity of basic plasma parameters (i.e. plasma density, light impurities and neutral beam injection(NBI) heating power) is analyzed. The VUV intensity increases with the increases of the NBI heating power, the electron density and impurity (carbon and lithium) concentration, which is qualitatively consistent with the prediction. In addition, the contribution to the VUV intensity of the C5+ ions generated though the charge exchange recombination process during the neutral beam injection has been estimated, and it indicates that this effect can be neglected.