EVALUATION OF ABLATION PLASMA CHARACTERISTICS OF INTENSE, PULSED, ION-BEAM EVAPORATION

Basic characteristics of an ablation plasma produced by an intense, pu lsed, ion beam have been evaluated from the measurement of ion-flux de nsity by a biased ion collector. The target mass loss is detected by t he measurement of the weight of the target in the comparison before an d after the shot. A one-dimensional hydrodynamic model is introduced w ith the assumption of a high-power, light-ion beam-driven expansion an d the following adiabatic expansion into vacuum. With this model, it i s possible for us to deduce the temperature and the pressure from the data of the ion flux and the mass loss of the target, respectively. Th is method is also applicable to other intense pulsed energy sources su ch as lasers or electron beams.