High-intensity laser-accelerated ion beam produced from cryogenic micro-jet target

We report on the successful operation of a newly developed cryogenic jet target at high intensity\udlaser-irradiation. Using the frequency-doubled Titan short pulse laser system at Jupiter Laser Fa-\udcility, Lawrence Livermore National Laboratory, we demonstrate the generation of a pure proton\udbeam a with maximum energy of 2 MeV. Furthermore, we record a quasi-monoenergetic peak at\ud1.1 MeV in the proton spectrum emitted in the laser forward direction suggesting an alternative\udacceleration mechanism. Using a solid-density mixed hydrogen-deuterium target, we are also able\udto produce pure proton-deuteron ion beams. With its high purity, limited size, near-critical density,\udand high-repetition rate capability, this target is promising for future applications