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Proceedings Paper

Characterization of bremsstrahlung x-ray emission as a reason for optics degradation at rep-rate e-beam-pumped KrF laser driver in IFE application
Author(s): Vladimir D. Zvorykin; S. V. Arlantsev; V. G. Bakaev; E. V. Polyakov; P. B. Sergeev; G. V. Sychugov; D. A. Zayarnyi
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Paper Abstract

Time-resolved scintillation technique and absolutely calibrated thermo-luminescence dosimeters have been applied to characterize bremsstrahlung x-ray emission from a large-aperture GARPUN KrF laser module pumped in a transverse geometry by double-sided e-beams stabilized by pulsed magnetic field of 0.1 T. It was produced by electrons with ~300 keV kinetic energy, 50 A/cm2 current density, and 100 ns pulse duration when they passed from vacuum diodes through foil windows into laser chamber and were decelerated in a working gas. Regularization algorithm was developed to reconstruct the bremsstrahlung spectra using experimental data on x-ray transmission through different absorbers. The energy fluence of ionizing radiation escaped onto laser windows has been measured. It was shown that a long-term degradation of optical transmission due to bremsstrahlung x-ray irradiation should be taken into account for KrF laser application in Inertial Fusion Energy.

Paper Details

Date Published: 10 November 2003
PDF: 4 pages
Proc. SPIE 5120, XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (10 November 2003); doi: 10.1117/12.515512
Show Author Affiliations
Vladimir D. Zvorykin, P.N. Lebedev Physical Institute (Russia)
S. V. Arlantsev, OKB Granat (Russia)
V. G. Bakaev, P.N. Lebedev Physical Institute (Russia)
E. V. Polyakov, P.N. Lebedev Physical Institute (Russia)
P. B. Sergeev, P.N. Lebedev Physical Institute (Russia)
G. V. Sychugov, P.N. Lebedev Physical Institute (Russia)
D. A. Zayarnyi, P.N. Lebedev Physical Institute (Russia)

Published in SPIE Proceedings Vol. 5120:
XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Krzysztof M. Abramski; Edward F. Plinski; Wieslaw Wolinski, Editor(s)

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