大连理工大学三束材料改性教育部重点实验室，辽宁大连 116024
近年来，太赫兹时域光谱技术 (THz-TDS)被用于多种等离子体源的电子密度诊断研究中，但其可靠性程度评估工作开展较少，亟需补齐相应研究。本文将 THz-TDS用于诊断电感耦合等离子体源(ICP)的电子密度，ICP驱动频率为 13.56 MHz，功率为 250~400 W，工作介质为氩气，气压为 30~99 Pa。诊断结果显示电子密度随输入功率和气压单调递增，电子密度范围为 1013 ~ 1014 cm -3。同时，利用 COMSOL Multiphysics构建漂移扩散模型对该条件下等离子体电子密度进行数值计算研究。结果显示：实验测量与数值计算的电子密度值定量吻合较好，且两者随气压变化趋势一致。证实了 THz-TDS应用到等离子体诊断领域中具有可靠性高、稳定性好等优异特性，具有非常广阔的发展潜力。
太赫兹时域光谱技术 等离子体诊断 电子密度 数值计算 Terahertz-Time Domain Spectroscopy plasma diagnostic electron density numerical simulation 太赫兹科学与电子信息学报
2022, 20(8): 804
中国工程物理研究院流体物理研究所, 四川 绵阳 621900
发展了一种基于角谱分离的全光分幅方式的多幅激光差分干涉与阴影成像诊断系统，可以在一次实验中拍摄2~4幅、幅间隔3~12 ns的高清晰阴影图像或干涉图像，并结合4f 差分干涉仪结构，可用于具有大密度梯度特征的Z箍缩等离子体的电子密度的高时空分辨诊断。在PTS(Primary Test Stand)装置的柱状单壳层钨丝阵Z箍缩实验中，一序列等离子体内爆阴影图像给出了内爆速度、压缩比、磁瑞利泰勒(MRT)不稳定性演化过程等观测结果。在XP-1 脉冲功率装置的平面钨丝阵实验中，得到的干涉图和电子密度计算结果给出了丝阵早期烧蚀阶段的等离子体分布及演化情况。
成像系统 等离子体诊断 多幅干涉 分幅成像 Z箍缩 电子密度 中国激光
2015, 42(12): 1208007
中国工程物理研究院 流体物理研究所， 四川 绵阳 621900
研制了两幅激光差分干涉诊断系统，可在一次实验中获得两幅间隔3～12 ns的高分辨干涉图像。该系统采用分光延时装置产生两束有一定夹角和时间间隔的探测激光脉冲，采用特殊的偏轴4f传像系统在同一块CCD的不同区域产生两幅干涉图像。应用该系统开展了铝丝阵Z箍缩激光干涉诊断实验，获得了丝膨胀和消融、晕等离子体产生和发展、以及先驱等离子体产生和发展等Z箍缩演化过程的实验图像，并给出了Z箍缩早期阶段的等离子体电子密度分布。
丝阵Z箍缩 等离子体诊断 差分干涉 剪切干涉 电子密度 wires Zpinch plasma diagnostic differential interferometry shearing interferometry electron density
Author Affiliations
Abstract
1 The Key Laboratory of Optoelectronic Technology and System,Ministry of Education, Chongqing University, Chongqing 400044, China
2 State Key Laboratory of High Power Laser and Physics, Shanghai Institute of Laser Plasma, Shanghai 201800, China
Several experiments are performed on the ShenGuang-II laser facility to investigate an x-ray source and test radiography concepts. X-ray lines emitted from laser-produced plasmas are the most practical means of generating these high intensity sources. By using a time-integrated space-resolved keV spectroscope and pinhole camera, potential helium-like titanium Kα x-ray backlighting (radiography) line source is studied as a function of laser wavelength, ratio of pre-pulse intensity to main pulse intensity, and laser intensity (from 7.25 to ~ 11.3×1015 W/cm2). One-dimensional radiography using a grid consisting of 5 μm Au wires on 16 μm period and the pinhole-assisted point projection is tested. The measurements show that the size of the helium-like titanium Kα source from a simple foil target is larger than 100 μm, and relative x-ray line emission conversion efficiency ξx from the incident laser light energy to heliumlike titanium K-shell spectrum increases significantly with pre-pulse intensity increasing, increases rapidly with laser wavelength decreasing, and increases moderately with main laser intensity increasing. It is also found that a gold gird foils can reach an imaging resolution better than 5-μm featured with high contrast. It is further demonstrated that the pinhole-assisted point projection at such a level will be a novel two-dimensional imaging diagnostic technique for inertial confinement fusion experiments.
x-ray source x-ray source plasma diagnostic techniques plasma diagnostic techniques x-ray spectra x-ray spectra Collection Of theses on high power laser and plasma physics
2010, 10(1): 075202
1 中国工程物理研究院激光聚变研究中心,四川绵阳,621900
2 中国科学院物理研究所,北京,100080
3 中国工程物理研究院激光聚变研究中心,四川绵阳,6
利用星光-II激光装置以较低泵浦功率密度获得了类Ne铬X射线激光,并以此为探针光建立了莫尔条纹偏折装置,获得了清晰的静态X射线激光莫尔条纹.介绍了实验方法,给出了实验结果,并对结果进行了讨论.
等离子体诊断技术 莫尔条纹装置 X射线激光 Plasma diagnostic Moire-fringe deflectometry X-ray laser
