Proton Acceleration Driven by High-Intensity Ultraviolet Laser Interaction with a Gold Foil

被引：0

作者：

路建新 ^{[1
]}

兰小飞 ^{[1
]}

王雷剑 ^{[1
]}

席晓峰 ^{[1
]}

黄永盛 ^{[1
]}

汤秀章 ^{[1
]}

王乃彦 ^{[1
]}

机构：

[1] China Institute of Atomic Energy

来源：

Plasma Science and Technology | 2013年 / 09期

基金：

中国国家自然科学基金;

关键词：

ultraviolet; ultra-short laser; proton; thin foil target; target normal sheath acceleration;

D O I：

暂无

中图分类号：

TN24 [激光技术、微波激射技术]; O572.341 [];

学科分类号：

070202 ; 0803 ; 080401 ; 080901 ;

摘要：

Proton acceleration induced by a high-intensity ultraviolet laser interaction with a thin foil target was studied on an ultra-short KrF laser amplifier called LLG50 in China Institute of Atomic Energy(CIAE).The ultraviolet laser produced pulses with a high-contrast of 109,duration of 500 fs and energy of 30 mJ.The p-polarized laser was focused on a 2.1 μm gold foil by an of-axis parabola mirror(OAP) at an incident angle of 45°.The laser intensity was 1.2×1017W/cm2.The divergence angle for proton energy of 265 keV or higher was 30°,which was recorded by a CR39 detector covered with 2 μm aluminum foil in the target normal direction.The maximum proton energy recorded by a CR39 detector covered with a 4 μm aluminum foil was 440 keV,and the proton energy spectrum was measured by a proton spectrometer.The ultraviolet laser acquires a relatively lower hot electron temperature,which can be ascribed to the proportional relationship of Iλ2,but a higher hot electron density because of the higher laser absorption and critical density.Higher electron density availed to strengthen the sheath electric field,and increased the proton acceleration.

引用

页码：863 / 865

页数：3