Characterization of bremsstrahlung x-ray emission as a reason for optics degradation at rep-rate e-beam-pumped KrF laser driver in IFE application

Vladimir D. Zvorykin; S. V. Arlantsev; V. G. Bakaev; E. V. Polyakov; P. B. Sergeev; G. V. Sychugov; D. A. Zayarnyi

doi:10.1117/12.515512

10 November 2003 Characterization of bremsstrahlung x-ray emission as a reason for optics degradation in rep-rate e-beam-pumped KrF laser driver in IFE application

Vladimir D. Zvorykin, S. V. Arlantsev, V. G. Bakaev, E. V. Polyakov, P. B. Sergeev, G. V. Sychugov, D. A. Zayarnyi

Author Affiliations +

Proceedings Volume 5120, XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; (2003) https://doi.org/10.1117/12.515512
Event: XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2002, Wroclow, Poland

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.

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Vladimir D. Zvorykin, S. V. Arlantsev, V. G. Bakaev, E. V. Polyakov, P. B. Sergeev, G. V. Sychugov, and D. A. Zayarnyi "Characterization of bremsstrahlung x-ray emission as a reason for optics degradation in rep-rate e-beam-pumped KrF laser driver in IFE application", Proc. SPIE 5120, XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (10 November 2003); https://doi.org/10.1117/12.515512

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