System validation of CO2-laser-based phase contrast imaging on HL-2A tokamak

作     者：Yi Yu Shaobo Gong Min Xu Boda Yuan Yifan Wu Lin Nie Rui Ke Minyou Ye Xuru Duan 余羿;龚少博;许敏;袁博达;吴一帆;聂林;柯锐;叶民友;段旭如

作者机构：School of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Southwestern Institute of PhysicsChengdu 610041China 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2018年第16卷第12期

页      面：31-36页

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Magnetic Confinement Fusion Energy Research Project(No.2015GB120002) the National Key Research and Development Program of China(No.2017YFE0300405) the National Natural Science Foundation of China(Nos.11705052,11575055,and 11611130164) 

主　　题：System validation of CO2-laser-based phase contrast imaging on HL-2A tokamak PCI HL CO 

摘      要：System validation and density fluctuation calibration of phase contrast imaging(PCI) on an HL-2 A tokamak are presented. Signals from different channels show not only a pronounced modulation of an incident laser beam induced by a sound wave, but also an excellent magnification and low image distortion of optics. The frequencywavenumber spectrum is achieved by using two-dimensional Fourier transform of time series signals. The conversion coefficient between detected signal amplitude and chord integral plasma density fluctuation is 2.35 × 1013m-2/mV, which promises a suitable signal level at the order of volts of the PCI in typical HL-2 A discharges.