Anomalous high energy electron emission from laser plasma

An original method based on direct measurements of electron emission has been proposed. The energy of fast electrons experimentally has been observed up to the value of 200 keV with current flux density 105 A/cm2. The dependencies of electron energy on radiation flux density as well as current density corresponding to cut off boundary of electron energy have been measured in the range of plasma temperatures from 70 to 200 eV. It is observed that a hydrodynamic instability leads to sharpening electron current pulse front at electron energy exceeding 100 eV. In the range of 1−10 keV the value of electron current more than 2 kA has been recorded. In this case, the current pulse duration is a few times more than the laser pulse, and the current pulse front is comparable with it.