射频等离子体原位恢复第一镜反射率关键技术及机理研究

第一镜原位清洗对于主动恢复第一镜反射率，延长第一镜使用寿命并保证相关光学诊断信号的有效性及可靠性至关重要。本申请针对国内外第一镜反射率恢复研究缺乏托卡马克原位环境下的结果，拟采用射频等离子体清洗技术，在与ITER结构和功能基本相似的EAST托卡马克装置中，利用材料与等离子体评估平台，开展射频等离子体原位清洗第一镜表面沉积层实验，研究托卡马克环境下射频等离子体参数对第一镜反射率恢复的影响；并采用蒙特卡罗程序ERO对实验结果进行模拟，阐明射频等离子体原位恢复第一镜反射率的机理，优化射频等离子体原位恢复第一镜反射率工艺参数。本项研究可为ITER光学诊断第一镜反射率原位恢复提供科学依据和数据积累。

First mirror (FM) in-situ cleaning is vitally important to actively recover the FM reflectivity, prolong the FM lifetime and guarantee the accurate and effectiveness of the relative diagnostic signals. Because of lacking the research results about the FM reflectivity recovery in a tokamak environment both at home and abroad, this application plans to carry out the in-situ FM contaminated layer cleaning experiments using radio frequency (RF) plasma cleaning technique on materials and plasma evaluation system (MAPES) in the EAST tokamak which has the similar structure and function with ITER, and investigate the influence of the RF plasma parameters on the FM reflectivity recovery in a tokamak environment. Then, this application also performs numerical modeling of the experiment results using Monte Carlo ERO in order to clarify the mechanism of in-situ FM reflectivity recovery by RF plasma and optimize the parameters of the RF plasma used to in-situ recover the FM reflecitivity. This study will provide scientific basis and data accumulation for the in-situ FM reflectivity recovery of ITER optical diagnostic systems.