The study of hot electron spectrum produced by ultrashort intense laser interact with solid target

The building and parameters of electron magnetic spectrometer which can be used to measure the hot electron produced by laser interact with target material directly was described in detail. The energy spectrum of hot electron produced by ultrashort intense laser interact with solid target was measured with this electron spectrometer. In the laser intensity of 5 x 10(15) W/cm(2), the maximum energy of hot electron is over 500 keV. The spectrum presents two-temperature Maxwell distribution with peak in 50 keV. The number of hot electrons is much more than the gamma-rays.