Effect of inner-surface roughness of conical target on laser absorption and fast electron generation

The effect of inner-surface roughness of conical targets on the generation of fast electrons in the laser-cone interaction is investigated using particle-in-cell simulation. It is found that the surface roughness can reduce the fast-electron number （in the energy range E 〉 1 MeV） and energy, as comp...

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Bibliographic Details
Published in:Chinese physics B 2014-05, Vol.23 (5), p.392-396
Main Author: 王欢 曹莉华 赵宗清 郁明阳 谷渝秋 贺贤土
Format: Article
Language:English
Subjects:
Computer simulation
Lasers
Particle in cell technique
Reflection
Reflectivity
Roughness
Surface roughness
Walls
光反射率
子代
激光吸收
相互作用
能量范围
表面粗糙度
超热电子
锥形
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Summary:The effect of inner-surface roughness of conical targets on the generation of fast electrons in the laser-cone interaction is investigated using particle-in-cell simulation. It is found that the surface roughness can reduce the fast-electron number （in the energy range E 〉 1 MeV） and energy, as compared to that from a cone with smooth inner wall. A scaling law for the laser reflectivity based on the vacuum-heating model is derived. Both theory and simulation indicate that laser reflection increases with the height-to-width ratio of the periodic inner surface structure and approaches that of a smooth cone as this ratio becomes zero.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/5/055202