Electron energy transport in the thin foil driven by high contrast high intensity laser pulse

The fast electron spectrum was measured for the interaction between the thin foil and the relativistic optical high field. There were two components in the electron spectrum. The higher temperature component was almost explained by the ponderomotive formula $Te[MeV] = 0.511(1+I18λμm2/1.37-1)$⁠. The total electron spectrum including the lower temperature component was also explained by a simple model.