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Shock pressure generated in aluminum targets due to the interaction
of 0.44 μm (3 ω of iodine laser) laser radiation has been
studied. The laser intensity profile was smoothed using phase zone
plates. Aluminum step targets were irradiated at an intensity
I ≈ 1014 W/cm2. Shock velocity in
the aluminum target was estimated by detecting the shock luminosity
from the target rear using a streak camera to infer the shock pressure.
Experimental results show a good agreement with the theoretical model
based on the delocalized laser absorption approximation. In the present
report, we explicitly discuss the importance of target thickness on the
shock pressure scaling.
The project ITEP-TWAC (Tera Watt Accumulator) being
in progress at ITEP (Moscow) requires He-like ions for
non-Liouvillean injection into the storage ring to accumulate
≈2·1013 particles with medium masses
up to 59Co25+. Powerful lasers were
found to be the best choice for those ions production.
This work presents the experimental results of highly charge
ion generation in plasmas produced by the second harmonic
of Nd-glass laser facility with a total energy E
≤ 50 J and pulse duration of about 2.5 ns at GPI (Moscow).
Ti and Ta targets were under investigation. An electrostatic
ion energy analyzer and an ion charge collector were used
to measure the ion charge state spectra at a 3-m distance
from the targets. 5·107 He-like Ti ions
per cm2 within 1 μs pulse as well as 107
Ta+41 per cm2 within 0.8 μs were
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