Thin aluminium foils irradiated by ultraintense femtosecond-long laser pulses have been extensively used in the last two decades for MeV-range proton beam generation. In the early stage of the interaction, a dense cloud of electrons is directly accelerated by the laser, pass through the target and ionize its rear surface. Here, an extremely high quasi-static electric field (of the order of TV/m) is established and it is responsible for ion and proton acceleration.
At SPARC_LAB, the high power ultrashort laser FLAME is currently employed in this research field. In this work, we report about measurements made on fast electrons and accelerated protons by means of two on-line tools, an Electro Optic Sampling diagnostic and a diamond-based Time-Of-Flight detector, respectively. In such a way, we could study the correlations existing between the two beams.
|Working group||Laser-driven ion acceleration|