Measurement of Hot Electrons Generation and Transport in Targets at Rearside Radiation
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Abstract
This paper reports hot electron energy spectrum measured with electron spectrometer, and Optical Transition Radiation measured with optical timeintegrated image of CCD during the interaction of lasersolid target in targets at the rearside radiation of laser on 20 Terawatt femtosecond laser facility. It shows that hot electron energy spectrum can be fitted with twotemperature likeMaxwellian distribution, with T≈90 and 280 keV,but average temperature of hot electrons T≈185 keV, which accorded with the known temperature scaling law. Because Optical Transition Radiation is produced by the hot electrons transport through solid targets, region of Optical Transition Radiation has lager radiation angle and optical intensity distribution. The main acceleration of hot electron comes from resonance absorption.
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