Effect of Foil Target Thickness in Proton Acceleration Driven by an Ultra-Short Laser

LU Jianxin (路建新); LAN Xiaofei (兰小飞); XI Xiaofeng (席晓峰); ZHANG Haifeng (张海峰); ZHANG Ji (张骥); WANG Leijian (王雷剑); TANG Xiuzhang (汤秀章); WANG Naiyan (王乃彦)

doi:10.1088/1009-0630/17/6/04

Plasma Science and Technology > 2015 > 17(6): 458-460. > DOI: 10.1088/1009-0630/17/6/04

LU Jianxin (路建新), LAN Xiaofei (兰小飞), XI Xiaofeng (席晓峰), ZHANG Haifeng (张海峰), ZHANG Ji (张骥), WANG Leijian (王雷剑), TANG Xiuzhang (汤秀章), WANG Naiyan (王乃彦). Effect of Foil Target Thickness in Proton Acceleration Driven by an Ultra-Short Laser[J]. Plasma Science and Technology, 2015, 17(6): 458-460. DOI: 10.1088/1009-0630/17/6/04

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Effect of Foil Target Thickness in Proton Acceleration Driven by an Ultra-Short Laser

China Institute of Atomic Energy, Beijing 102413, China

Funds: supported by the Key Project of Chinese National Programs for Fundamental Research (973 Program) (No. 2011CB808104) and National Natural Science Foundation of China (Nos. 11335013, 11375276, 11105234)

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Received Date: September 27, 2014

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Abstract

Abstract

Proton acceleration experiments were carried out by a 1.2×10¹⁸ W/cm² ultra-short laser interaction with solid foil targets. The peak proton energy observed from an optimum target thickness of 7 µm in our experiments was 2.1 MeV. Peak proton energy and proton yield were investigated for different foil target thicknesses. It was shown that proton energy and conversion efficiency increased as the target became thinner, on one condition that the preplasma generated by the laser prepulse did not have enough shock energy and time to influence or destroy the target rear-surface. The existence of optimum foil thickness is due to the effect of the prepulse and hot electron transportation behavior on the foil target.
- ultra-short laser,
- proton,
- thin foil target,
- target normal sheath acceleration

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