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《Chinese Journal of High Pressure Physics》 2012-04
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An Integrated Velocity Profile Measurement from Nanosecond Pulse Laser-Driven Mini-Flyer to Shocked Sample

LI Jun,LI Jia-Bo,ZHOU Xian-Ming,WANG Xiang,WENG Ji-Dong,LI Jian-Feng(National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics,CAEP,Mianyang 621900,China)  
It is very important to develop a high time and space resolved velocity diagnostic technique for laser-driven shock wave experiments.However,it is still a difficult problem because of the limited size of laser-launched mini-flyer and ultra-short loading time in shocked sample.Thus,a micro focus Doppler pins system with time resolution of 50 ps and spatial resolution of 200 mm has been developed in our nanosecond laser-driven shock wave experiments,to perform an integrated velocity profile measurement from laser driven mini-flyer to impacted sample.The measured particle velocity of Z-cut quartz sample is 1.27 km/s while the impact velocity of 6 μm-thick Al foil flyer is 2.48 km/s,which is in agreement with the calculated Hugoniot results.This validates our technique.Using our technique,the experimental results for three different types of mini-flyers show that the "substrate/deposit layer/silicone oil/Al foil flyer" structure has higher laser energy coupling efficiency and better integrity.This is valuable for designing a laser-driven shock wave experimental assembly.These results indicate that our technique is a viable approach for studying dynamics of laser-driven shock wave in materials.
【Fund】: 中国工程物理研究院双百人才基金(ZX01111);; 冲击波物理与爆轰物理实验室基金(9140C670402120C6706)
【CateGory Index】: TN249
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