Free-surface velocity measurements of opaque materials in laser-driven shock-wave experiments using photonic Doppler velocimetry  

作　　者：N.Nissim E.Greenberg M.Werdiger Y.Horowitz L.Bakshi Y.Ferber B.Glam A.Fedotov-Gefen L.Perelmutter S.Eliezer 

机构地区：[1]Applied Physics Division,Soreq NRC,Yavne,Israel Note:This paper is part of the Special Issue on Matter in Extreme States Created by Laser.

出　　处：《Matter and Radiation at Extremes》2021年第4期43-50,共8页极端条件下的物质与辐射（英文）

摘　　要：We present a novel photonic Doppler velocimetry(PDV)design for laser-driven shock-wave experiments.This PDV design is intended to provide the capability of measuring the free-surface velocity of shocked opaque materials in the terapascal range.We present measurements of the free-surface velocity of gold for as long as∼2 ns from the shock breakout,at pressures of up to∼7 Mbar and a free-surface velocity of 7.3 km/s with an error of∼1.5%.Such laboratory pressure conditions are achieved predominantly at high-intensity laser facilities where the only velocity diagnostic is usually line-imaging velocity interferometry for any reflector.However,that diagnostic is limited by the lower dynamic range of the streak camera(at a temporal resolution relevant to laser shock experiments)to measure the free-surface velocity of opaque materials up to pressures of only∼1 Mbar.We expect the proposed PDV design to allow the free-surface velocity of opaque materials to be measured at much higher pressures.

关 键 词：shock wave INTERFEROMETRY 

分 类 号：TH824[机械工程—仪器科学与技术] TB30[机械工程—精密仪器及机械]