特高压输电线路电晕放电引起的电磁环境问题已成为制约线路结构设计与导线选型的重要因素。电磁环境影响参数如地面合成电场、离子流密度和电晕损失等主要由电晕场分布决定。而空间的电晕场分布是电离区的放电和传导区的离子迁移共同作用的结果。传导区各种离子的迁移率不同，深入研究电晕传导区有何种主要离子及其迁移速度是揭示电磁环境机理的关键。. 本项目拟在湿度和气压可控的大尺度放电容器中进行电晕实验，采用质谱法诊断不同湿度下电晕产生的离子种类以及测量离子的相对浓度。首次将多普勒频移激光诱导荧光谱法引入电晕研究，搭建电流、电压和离子迁移速度时空分辨的同步测量平台，研究传导区关键离子的迁移速度分布。建立考虑水分子反应通道的零维等离子体化学反应模型，研究不同时间尺度下电晕放电的离子动态演变过程。综合实验测量和仿真研究，从微观角度定量研究电晕传导区离子迁移特性，推动电晕放电基本理论及应用的进步。

The electromagnetic environment problem caused by corona discharge in UHV transmission line becomes a major constraint to the design of conductor structure and type. The electromagnetic environmental parameters such as the electric field on the ground, the ion flux density and corona losses are mainly decided by the corona field distribution. The corona field distribution is the result of the discharge in ionization region and the ion transportation in conduction region. Various ions in conduction region have different ion mobility. Therefore, in-depth study on the main ion species and its drift velocity distribution is the key to reveal the mechanism of electromagnetic environment problem.. The corona discharge experiment will be performed in a large-scale humidity and pressure controlled vessel. The mass spectrometry will be used to diagnostic ion species produced under different humidity and measure the relative concentrations of major ions. For the first time the Doppler shifted laser induced fluorescence (DSLIF) spectroscopy is introduced into corona discharge diagnostics. The synchronized diagnostic system of corona current, voltage and the drift velocity will be built. The velocity distribution of major ions will be measured in the drift region by DSLIF. A zero-dimensional plasma chemical reaction model, which considers the influence of water molecules, will be built. The dynamic evolution of major ions under different time scales will be calculated. In this project, the ion transport properties in the corona drift region will be investigated quantitatively from the microscopic point by the experiment and simulation. Thus the understanding of the gas discharge theory and applications will be improved.