Study on ablation of target material irradiated by 0.lGW/cm2 pulsed proton beams

The process of ablation due to irradiation of medium power pulsed ion beams is investigated using a “collector-RES method” together with a charged-particle detection method. The ablation mass and angular distribution are evaluated as a function of the ion current density and the target material. To eliminate the carbon contamination of the beam, an independent trial is made to deflect the neutralized ion beams by a “momentum filter” using a transverse magnetic field. It is shown that the measured focus points agree well with those calculated under the assumption of no electric field, although the ion current density is high enough for the polarization electric field to hinder the ions from being deflected.