Ion production by lasers using high-power densities in a near infrared region
Rohlena, K. ; Králiková, B. ; Krása, J. ; Láska, L. ; Mašek, K. ; Pfeifer, M. ; Skála, J. ; Farny, J. ; Parys, P. ; Wołowski, J. ; Woryna, E. ; Mróz, W. ; Roudskoy, I. ; Shamaev, O. ; Sharkov, B. ; Shumshurov, A. ; Bryunetkin, B.A. ; Haseroth, H. ; Collier, J. ; Kuttenbeger, A. ; Langbein, K. ; Kugler, H.
In: Laser and Particle Beams, 1996, vol. 14, no. 3, p. 335-345
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- Results are presented of experiments on ion production from Ta targets using a short pulse (350-600 ps in focus) illumination with focal power densities exceeding 1014 Wcm-2 at the wavelength of an iodine photodissociation laser (1.315 μm) and its harmonics. Strong evidence of the existence of tantalum ions with the charge state +45 near the target surface was obtained by X-ray spectroscopy methods. The particle diagnostics point to the existence of frozen high charge states (<53+) of Ta ions in the far expansion zone at about 2 m from the target. The measured charge state-ion energy distribution indicates the highest energy (>4 MeV) for the highest observed charge states. A tentative theoretical explanation of the observed anomalous charge state freezing phenomenon in the expanding plasma produced by a subnanosecond laser pulse is given