The Temperature Measurement And Heat Flux Analysis Of EAST Devitor Based On Infrared Camer

During the discharge of the Experimental Advanced Superconducting Tokamak(EAST),the divertor target plate(DTP)accumulates a large amount of heat flux and suffers irreversible damages,so building of a real-time temperature measurement system for DTP and analyzing the heat flux distribution are crucial for guaranteeing the steady running of EAST.The main research in this paper is to analyze the heating characteristics of the upper divertor target plate by calculating the temperature and heat flux of the upper divertor target plate(UDTP)with the existing infrared diagnostic system.The temperature measurement method proposed in this paper improve the accuracy using emissivity model,and the method can be divided into three steps.Firstly,the spectral response function,the geometric factor and the radiation coming from the inner parts of the measurement system are obtained using a reference blackbody placed inside EAST based on multi-temperature calibration method.Then,a nonlinear model is built in this paper to describe the dependence of spectral band emissivity of the divertor material on temperature.Finally,the surface temperature of UDTP during discharge is obtained by solving the temperature equation using this emissivity model prior.The heat flux calculation program of UDTP is developed by the finite element method.Firstly,according to the physical structure and material of UDTP,the heat flux calculation model is established,and grid points are divided with appropriate size.The 3D transient temperature field is solved by finite element method whose input is the corrected surface tempereature.Finally,the surface heat flux of UDTP is calculated according to the 3D transient temperature field information.The heat flux of UDTP is calculated,by which the effect of different heat power on the heat flux distribution is analyzed.The temperature measurement method proposed in this paper effectively improves the accuracy of temperature measurement of UDTP.The developed heat flux calculation program is an important tool for heat flux research.Moreover,the heat flux results under several different conditions are given in this paper.The research in this paper is of great significance to the study of heat transfer of divertor.