Development of a 2D spatial displacement estimation method for turbulence velocimetry of the gas puff imaging system on EAST  

作　　者：李乐天 刘少承 颜宁 刘晓菊 高翔 Letian LI;Shaocheng LIU;Ning YAN;Xiaoju LIU;Xiang GAO(Anhui University,Hefei 230039,People's Republic of China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People's Republic of China)

机构地区：[1]Anhui University,Hefei 230039,People's Republic of China [2]Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People's Republic of China

出　　处：《Plasma Science and Technology》2024年第3期17-24,共8页等离子体科学和技术（英文版）

基　　金：supported by the National Magnetic Confinement Fusion Energy R&D Program of China(Nos.2022YFE03030001,2022YFE03020004 and 2022YFE 03050003);National Natural Science Foundation of China(Nos.12275310,11975275,12175277 and 11975271);the Science Foundation of Institute of Plasma Physics,Chinese Academy of Sciences(No.DSJJ-2021-01);the Collaborative Innovation Program of Hefei Science Center,Chinese Academy of Sciences(No.2021HSC-CIP019);the Users with Excellence Program of Hefei Science Center,Chinese Academy of Sciences(Nos.2021HSC-UE014 and 2021HSCUE012)。

摘　　要：A gas puff imaging(GPI)diagnostic has been developed and operated on EAST since 2012,and the time-delay estimation(TDE)method is used to derive the propagation velocity of fluctuations from the two-dimensional GPI data.However,with the TDE method it is difficult to analyze the data with fast transient events,such as edge-localized mode(ELM).Consequently,a method called the spatial displacement estimation(SDE)algorithm is developed to estimate the turbulence velocity with high temporal resolution.Based on the SDE algorithm,we make some improvements,including an adaptive median filter and super-resolution technology.After the development of the algorithm,a straight-line movement and a curved-line movement are used to test the accuracy of the algorithm,and the calculated speed agrees well with preset speed.This SDE algorithm is applied to the EAST GPI data analysis,and the derived propagation velocity of turbulence is consistent with that from the TDE method,but with much higher temporal resolution.

关 键 词：gas puff imaging spatial displacement estimation SDE edge turbulence velocity TDE EAST tokamak 

分 类 号：TL631.24[核科学技术—核技术及应用]