面向等离子体部件实验条件对FBG的温度与应变协同测量特性的影响研究

随着面向等离子体部件（PFC）的不断升级，托卡马克实验开始向长脉冲高参数发展，使得PFC上的诊断系统渐渐难以满足要求。光纤布拉格光栅（FBG）是一种基于光信号、可同时测量温度与应变等参数的新型诊断技术。鉴于其的优秀特质，本项目拟开展瞬态、稳态以及循环热负荷等PFC实验条件对FBG的温度、应变协同测量特性的影响研究。根据这些实验条件下FBG光信号的变化特点以及测量灵敏度、准确度等的分析结果，揭示瞬态、稳态热负荷对FBG温度测量特性的影响机制；掌握循环热负荷对FBG温度、应变协同测量特性的影响规律并优化温度补偿应变测量的方法；建立PFC上热力场数据、PFC表面温度场数据、PFC上方热流分布三者之间的映射关系模型。通过这项工作，本项目将促进FBG诊断技术在水冷钨PFC上的应用，从而为等离子体与壁相互作用的研究提供重要的技术支持。

With the upgrade of plasma facing components (PFCs) in worldwide tokamak devices, the discharge experiments tend to long pulse H-mode. While the diagnostic systems on PFCs are insufficient to meet the more and more strict requirements. Fiber Bragg grating (FBG) is a new diagnostic technique that based on optical signal and can be used for the measurement of several parameters (temperature, strain and et al.). Considering its excellent properties, FBG will be studied comprehensively in this project. The main work is to study the influence of the experimental conditions of PFCs （such as transient, steady-state, cyclic heat loads and et al.）on the characteristics of simultaneous measurement of temperature and strain with FBG. Based on the optical signal, the measurement sensitivity and accuracy of FBG, three main targets should be reached: the effect mechanism of the transient and static heat loads on the temperature sensing properties will be revealed; the influence law of the cyclic heat loads on the simultaneous measurement of temperature and strain will be caught on so that contributing to optimizing a temperature compensation method for the strain measurement; the mapping relationship among the temperature and stress field data of PFC, the surface temperature distribution of PFC and the heat flux distribution above the PFC will be established. Under this condition, the FBG-based diagnostic is willing to be applied in actively water-cooled tungsten PFCs and be prospectively helpful for the further study on plasma wall interaction.