کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8133455 | 1523440 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Wide range scaling laws for radiation driven shock speed, wall albedo and ablation parameters for high-Z materials
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Wide range scaling laws for radiation driven shock speed, wall albedo and ablation parameters for high-Z materials Wide range scaling laws for radiation driven shock speed, wall albedo and ablation parameters for high-Z materials](/preview/png/8133455.png)
چکیده انگلیسی
Radiation hydrodynamic (RHD) simulations for four different potential high-Z hohlraum materials, namely Tungsten (W), Gold (Au), Lead (Pb), and Uranium (U) are performed in order to investigate their performance with respect to x-ray absorption, re-emission and ablation properties, when irradiated by constant temperature drives. A universal functional form is derived for estimating time dependent wall albedo for high-Z materials. Among the high-Z materials studied, it is observed that for a fixed simulation time the albedo is maximum for Au below 250Â eV, whereas it is maximum for U above 250Â eV. New scaling laws for shock speed vs drive temperature, applicable over a wide temperature range of 100Â eV to 500Â eV, are proposed based on the physics of x-ray driven stationary ablation. The resulting scaling relation for a reference material Aluminium (Al), shows good agreement with that of Kauffman's power law for temperatures ranging from 100Â eV to 275Â eV. New scaling relations are also obtained for temperature dependent mass ablation rate and ablation pressure, through RHD simulation. Finally, our study reveals that for temperatures above 250Â eV, U serves as a better hohlraum material since it offers maximum re-emission for x-rays along with comparable mass ablation rate. Nevertheless, traditional choice, Au works well for temperatures below 250Â eV. Besides inertial confinement fusion (ICF), the new scaling relations may find its application in view-factor codes, which generally ignore atomic physics calculations of opacities and emissivities, details of laser-plasma interaction and hydrodynamic motions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: High Energy Density Physics - Volume 27, June 2018, Pages 1-11
Journal: High Energy Density Physics - Volume 27, June 2018, Pages 1-11
نویسندگان
Gaurav Mishra, Karabi Ghosh, Aditi Ray, N.K. Gupta,