HL-3装置垂直汤姆逊散射系统激光传播特性的研究  

Study of the laser propagation characteristics of the vertical Thomson scattering system on HL-3 tokamak

作　　者：龚少博[1] 张通川 郭文平 侯智培 翟文延 刘春华[1] 邓必河 石中兵[1] 钟武律[1] 许敏[1] 段旭如[1] GONG Shao-bo;ZHANG Tong-chuan;GUO Wen-ping;HOU Zhi-pei;ZHAI Wen-yan;LIU Chun-hua;DENG Bi-he;SHI Zhong-bing;ZHONG Wu-lü;XU Min;DUAN Xu-ru(Southwestern Institute of Physics,Chengdu 610041)

机构地区：[1]核工业西南物理研究院,成都610041

出　　处：《核聚变与等离子体物理》2025年第1期64-68,共5页Nuclear Fusion and Plasma Physics

基　　金：中核集团青年英才项目(2022JZYF-03)。

摘　　要：HL-3装置上发展了一套垂直边缘汤姆逊散射诊断系统,该系统采用波长1064nm、能量0.6~2J、重复频率30Hz、脉冲宽度15ns的Nd:YAG激光作为诊断光束。入射激光垂直穿过等离子体区域,在水平方向上收集散射光信号。对Nd:YAG激光传播特性进行了实验研究,利用非理想高斯光束传播方程对实验数据进行了拟合,得到了入射激光的束腰半径、束腰位置及品质因子等重要参数。基于实验获得的入射激光参数,设计了一套伽利略扩束准直系统和单透镜聚焦方案,在观测视场中心成功获得了束腰半径为2mm的激光光斑。所开展的Nd:YAG激光传播特性研究不仅是确定汤姆逊散射系统观测视场的关键,也是开展消杂散光孔径光阑设计的基础。A vertical edge Thomson scattering diagnostic system on HL-3 tokamak has been developed recently.The Nd:YAG laser(1064nm,0.6~2J,30Hz,15ns)is used as the probe beam.The laser beam propagates vertically through the plasma region and the scattered light is observed horizontally.The propagation characteristics of the Nd:YAG laser is studied experimentally.The experimental data are fitted by the propagation equation of non-ideal Gaussian beam,and the important parameters such as waist radius,waist position and quality factor of the incident laser are obtained.Based on the incident laser parameters obtained from the experiment,a Galileo beam expansion collimation system and a single lens focusing scheme are designed,and a laser spot with a waist radius of 2mm is successfully obtained in the center of the observation field of view.The study and development on the propagation characteristics of Nd:YAG laser is not only the key to determine the field of view of Thomson scattering system,but also the basis for the design of baffles for stray light suppression.

关 键 词：汤姆逊散射系统 高斯光束 准直聚焦光路 

分 类 号：O536[理学—等离子体物理]