MeV proton generation with a kHz femtosecond laser

Summary from only given. Ti:sapphire laser systems are now reaching levels where they may be used to investigate this proton generation. We report here, the first experiments made in this regime. To accomplish this, we needed to employ a target geometry that would allow accurate replenishment of the target material, presenting a virgin target surface to each laser pulse with a spatial precision of a few microns. The laser used in the present experiments consists of a mode-locked Ti:sapphire a regenerative amplifier followed by a double pass booster amplifier.