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《High Power Laser & Particle Beams》 2005-11
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Laser intensity effects on forward hot electrons in interaction with Al foil

ZHANG Miao,WANG Chen,FANG Zhi-heng,WANG Rui-rong,FU Si-zu,GU Yuan,LIN Zun-qi (National Laboratory on High Power Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,P.O.Box 800-211,Shanghai 201800,China)  
The characteristics of the forward hot electrons produced by 20 TW p-polarized picosecond laser-plasma interactions are studied at laser intensities from subrelativistic to relativistic.The spatial distribution of forward hot electrons is multi-peak distribution,as laser intensity is under 10~7 W/cm~2.When laser intensity is between 10~(17) and 10~(18) W/cm~2,the peak of the hot electron beam is along the target normal direction.The peak of the hot electron beam shifts to the laser propagation direction from the target normal direction as the laser intensity reaches the relativistic.The temperature of hot electrons fit resonance absorption scaling law as the laser intensity under the relativistic.The temperature of hot electrons is much higher than that expected by the empirical scaling law as the laser intensity reaches the relativistic.
【Fund】: 国家自然科学基金资助课题(29825106 20073053)
【CateGory Index】: O462
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