Measurements of Ablation Pressure and Mass Ablation Rate Using a Target Pendulum and a Thin Foil Target at 10 mu M Laser Wavelength

摘要

The ablation pressure and the mass ablation rate for 10 mu m laser were measured using two methods of a target pendulum and shifted X-ray emission images which was equivalent to X-ray back-lighting. The measured ablation pressure was 10 Mbar and the mass ablation rate was 10 exp 6 g/cm exp 2 .sec at the absorbed laser intensity of 5 x 10 exp 13 W/cm exp 2 . Comparing the ablation mass rate measured by the pendulum with that derived from the penetration depth of the hot electrons using K sub( alpha ) line emission, we could identify the hot electron driven ablation as a dominant process of the ablation in the case of 10 mu m wavelength. Our results were also compared with the theory of hot electron driven ablation using a self regulated flow model. (Atomindex citation 14:756880)