14 research outputs found
Measurements of X-ray spectral opacity of dense plasma at ISKRA-5 laser facility
Powerful iodine ISKRA-5 laser facility was upgraded and
now operates on the second harmonic. Experiments were performed to measure
the x-ray spectral opacity of dense plasma of different materials. Sample of
material under study was fabricated as a thin plate with the 0.1-0.15 m thickness and was heated by the soft x-rays generated by irradiation of a
thin film gold converter by one beam of the ISKRA-5 laser facility. Typical
laser intensity on the converter was (1-5)10 W/cm and
laser pulse duration was 0.5-0.6 ns. The effective temperature of sample
under experimental conditions didn't exceed 30-40 eV. The sample was
tampered by 1 m plastic layers on both sides to avoid its
rarefaction during heating and to obtain a quasistationary layer of a dense
plasma prepared to be probed by a backlighter. The backlighter was aluminum
or dysprosium film irradiated by another beam of the ISKRA-5 laser facility
with an intensity of 10-10 W/cm. Probe x-rays were
registered by a Bragg spectrometer with spatial resolution. Comparison
between experimental data and simulations is discussed
Simulations of a Ne-like Ge X-ray laser and comparison with experiments in RFNC-VNIIEF
The results of 3D simulations of the laboratory Ne-like
Ge x-ray laser in RFNC-VNIIEF are in good agreement with the experimental
data. Calculations show that considerable rise of brightness and transverse
coherence length can be achieved under half-cavity conditions