The effect of target materials on colliding laser-produced plasmas

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[1] Li, Xingwen
[2] Yang, Zefeng
[3] Wu, Jian
[4] Han, Jiaxun
[5] Wei, Wenfu
[6] Jia, Shenli
[7] Qiu, Aici
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| 1600年 / American Institute of Physics Inc.卷 / 119期
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In laser ablation; nanosecond to femtosecond lasers with a wide range of laser power densities are used. During ablation; the result of collisions between two plasmas is of interest to many researchers in inertial confinement fusion and nuclear astrophysics. In this paper; the collisions of two seed plasmas ablated from planar target surfaces of different target materials (Al; Cu; and W) were studied with temporal-spatially resolved imaging and spectroscopy. The initial relative velocities and densities of the seed plasmas were measured; and then the collisional parameters were calculated to evaluate the degree of the collisions. In addition; spatially resolved spectra were analyzed to study the influences of materials on the temporal-spatial distribution of atom or ions. The results indicated that under the same laser intensity; the high atomic number (Z) material had a small value of collisionality parameter; mostly because of its heavy ion mass. Higher laser intensity would increase the initial relative velocity of seed plasmas; resulting in a lower collision frequency. In addition; the distribution of the ions from seed plasmas was influenced by the stagnation layer plasmas. © 2016 AIP Publishing LLC;
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