In this work we present experimental results on the behavior of diamond at megabar pressure. The experiment was performed using the PHELIX facility at GSI in Germany to launch a planar shock into solid multi-layered d...In this work we present experimental results on the behavior of diamond at megabar pressure. The experiment was performed using the PHELIX facility at GSI in Germany to launch a planar shock into solid multi-layered diamond samples. The target design allows shock velocity in diamond and in two metal layers to be measured as well as the free surface velocity after shock breakout. As diagnostics, we used two velocity interferometry systems for any reflector(VISARs). Our measurements show that for the pressures obtained in diamond(between 3 and 9 Mbar),the propagation of the shock induces a reflecting state of the material. Finally, the experimental results are compared with hydrodynamical simulations in which we used different equations of state, showing compatibility with dedicated SESAME tables for diamond.展开更多
We present a recent numerical analysis of impedance mismatch technique applied to carbon equation of state measurements.We consider high-power laser pulses with a Gaussian temporal profile of different durations.We sh...We present a recent numerical analysis of impedance mismatch technique applied to carbon equation of state measurements.We consider high-power laser pulses with a Gaussian temporal profile of different durations.We show that for the laser intensity(≈1014W/cm2)and the target design considered in this paper we need to have laser pulses with rise-time less than 150 ps.展开更多
We present an experimental study of the dynamics of shocks generated by the interaction of a double-spot laser in different kinds of targets:simple aluminum foils and foam-aluminum layered targets.The experiment was p...We present an experimental study of the dynamics of shocks generated by the interaction of a double-spot laser in different kinds of targets:simple aluminum foils and foam-aluminum layered targets.The experiment was performed using the Prague PALS iodine laser working at 0.44μm wavelength and irradiance of a few 10^(15)W/cm^(2).Shock breakouts for pure Al and for foam-Al targets have been recorded using time-resolved self-emission diagnostics.Experimental results have been compared with numerical simulations.The shocks originating from two spots move forward and expand radially in the targets,finally colliding in the intermediate region and producing a very strong increase in pressure.This is particularly clear for the case of foam layered targets,where we also observed a delay of shock breakout and a spatial redistribution of the pressure.The influence of the foam layer doped with high-Z(Au)nanoparticles on the shock dynamics was also studied.展开更多
基金the support of the laser technical team at GSI PHELIXhas been carried out within the framework of the EUROfusion Enabling Research Project:ENR-IFE19.CEA-01‘Study of Direct Drive and Shock Ignition for IFE:Theory,Simulations,Experiments,Diagnostics Development’and has received funding from Euratom 2019–2020。
文摘In this work we present experimental results on the behavior of diamond at megabar pressure. The experiment was performed using the PHELIX facility at GSI in Germany to launch a planar shock into solid multi-layered diamond samples. The target design allows shock velocity in diamond and in two metal layers to be measured as well as the free surface velocity after shock breakout. As diagnostics, we used two velocity interferometry systems for any reflector(VISARs). Our measurements show that for the pressures obtained in diamond(between 3 and 9 Mbar),the propagation of the shock induces a reflecting state of the material. Finally, the experimental results are compared with hydrodynamical simulations in which we used different equations of state, showing compatibility with dedicated SESAME tables for diamond.
基金supported by ESF (SILMI, 3964)EU COST programRFBR (12-01-96500, 11-01-00707)
文摘We present a recent numerical analysis of impedance mismatch technique applied to carbon equation of state measurements.We consider high-power laser pulses with a Gaussian temporal profile of different durations.We show that for the laser intensity(≈1014W/cm2)and the target design considered in this paper we need to have laser pulses with rise-time less than 150 ps.
基金funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No.633053supported by the European Union under the Laserlab program,by the Competitiveness Program of NRNU MEPh I,Russia,and by the Czech Ministry of Education,Youth and Sports(CMEYS),projects LTT17015 and LM2018114。
文摘We present an experimental study of the dynamics of shocks generated by the interaction of a double-spot laser in different kinds of targets:simple aluminum foils and foam-aluminum layered targets.The experiment was performed using the Prague PALS iodine laser working at 0.44μm wavelength and irradiance of a few 10^(15)W/cm^(2).Shock breakouts for pure Al and for foam-Al targets have been recorded using time-resolved self-emission diagnostics.Experimental results have been compared with numerical simulations.The shocks originating from two spots move forward and expand radially in the targets,finally colliding in the intermediate region and producing a very strong increase in pressure.This is particularly clear for the case of foam layered targets,where we also observed a delay of shock breakout and a spatial redistribution of the pressure.The influence of the foam layer doped with high-Z(Au)nanoparticles on the shock dynamics was also studied.
