The Spectral Broadening of Motional Stark Effect in the HL-2A Tokamak  

作　　者：JIANG Nan YU De-Liang YAN Long-Wen CAO Jian-Yong ZHONG Wu-Lu CHEN Cheng-Yuan LIU Yi LEI Guang-Jiu YANG Qing-Wei DUAN Xu-Ru 姜楠;余德良;严龙文;曹建勇;钟武律;陈程远;刘仪;雷光玖;杨青巍;段旭如(Southwestern Institute of Physics,Chengdu 610041)

机构地区：[1]Southwestern Institute of Physics,Chengdu 610041

出　　处：《Chinese Physics Letters》2013年第6期131-134,共4页中国物理快报（英文版）

基　　金：Supported by the National Magnetic Confinement Fusion Science Program of China under grant No 2010GB101001;the National Natural Science Foundation of China under Grant Nos 11075046 and 10935004;the China-Korean Joint Foundation under Grant No 2012DFG02230.

摘　　要：The spectral broadening of motional Stark effect(MSE)is simulated in the HL-2A tokamak,which is in good agreement with the experimental observation.The divergence angle of the neutral beam,finite lens size and beam energy dissociation are the main broadening factors,while the lens size is the most important one.The experimental spectra fitted by multiple Gaussian distributions reveal that the Stark splitting and its full width at half maximum(FWHM)are~0.07 nm and~0.19 nm,respectively.Therefore,theπandσcomponents of the MSE will overlap since the Stark splitting is much smaller than its spectral broadening.A narrowband filter with the FWHM of about 0.16 nm is good enough to isolate the two components for providing the polarization fraction over 50%,which guarantees reasonable measurement precision for magnetic field pitch angle.

关 键 词：BEAM SPLITTING SPECTRAL 

分 类 号：TL6[核科学技术—核技术及应用]