 These beams are then focussed in the middle of a 2 m diameter vacuum chamber where they irradiate targets of different types.The interaction itself and the characteristics of the laser-generated hot plasmas are diagnosed by a whole set of dedicated diagnostics.PICO2000, the adaptation of one NANO2000 laser chain in the picosecond regime, will deliver 200 J in 1 ps at 1.05 μm.