TITLE:
X-Ray and VUV Spectra from the Laser Plasma Produced with “Kanal-2” Facility
AUTHORS:
Andrey Aleksandrovich Kologrivov, Mikhail Vladimirovich Osipov, Victor Nikolaevich Puzyrev, Alexandr Nikolaevich Starodub, Oleg Feliksovich Yakushev
KEYWORDS:
Laser Plasma; X-Ray Spectra; VUV Spectra; Plasma Diagnostics
JOURNAL NAME:
Journal of Modern Physics,
Vol.5 No.2,
January
22,
2014
ABSTRACT:
The paper presents
experimental results obtained on “Kanal-2” facility. Laser radiation focusing
on the surface of plane magnesium targets created the high temperature plasma,
which emitted X-ray and vacuum ultraviolet (VUV) radiation. This radiation
spectrum was investigated with two spectrographs: the mica crystal spectrograph
(working range 8.2 ? - 9.6 ?) and the grazing incidence VUV
spectrograph (working rage 30 ? - 130 ?).
A set of beryllium stepwise attenuators appended the diagnostic complex and allowed
us to get an approximated picture of a continuous spectrum within the range of 2.2 ? - 6.2 ?. The estimation of the plasma electron temperature Te from the ratio between the intensity of the dielectronic satellites and the
resonance line gives Te ~ 180 eV. The ratio between the intensity of the
resonance and intercombination lines gives the electron density of the emitting
zone ne ~ 2 × 1019 cm-3. Some lines
observed within the spectral range of 8.5 ? - 9.1 ? belong to none of the transitions of Mg ions. Perhaps the observed spectrum is
determined by the transitions in so-called hollow ions of Mg, i.e. in the ions with unfilled inner
shells. The spectra obtained with the grazing incidence spectrograph and with
the minimum-directioned discrepancy iteration method of spectrum reconstruction
from the attenuation curve in the beryllium stepwise attenuators are also
presented.