首页|Nonstationary laser-supported ionization wave in layer of porous substance with subcritical density
Nonstationary laser-supported ionization wave in layer of porous substance with subcritical density
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A time-dependent analytical solution is found for the velocity of a plane ionization wave generated under nanosecond laser pulse action on the surface of a flat layer of low-Z porous substance with density less than the critical density of the produced plasma.With corrections for the two-dimensional nature of the problem when a laser beam of finite radius interacts with a flat target,this solution is in quantitative agreement with measurements of ionization wave velocity in various experiments.The solution compared with experimental data covering wide ranges of performance conditions,namely,(3-8)×1014 W cm-2 for laser pulse intensity,0.3-3 ns for pulse duration,0.35-0.53 μm for laser wavelength,100-1000 μm for laser beam radius,380-950 μm for layer thickness,4.5-12 mg cm-3 for average density of porous substance,and 1-25 μm for average pore size.The parameters of the laser beam that ensure the generation of a plane ionization wave in a layer of subcritical porous matter are determined for the problem statements and are found to meet the requirements of practical applications.
S.Yu Gus'kov、R.A.Yakhin
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P.N.Lebedev Physical Institute of Russian Academy of Sciences,Leninskii Prospect 53,Moscow 119991,Russia
program of the National Center for Physics and Mathematics in the section of High Energy Density Physics
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