1 March 2001 Electron beam transport and foil stability in high-energy e-beam-pumped KrF lasers
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Proceedings Volume 4351, Laser Optics 2000: High-Power Gas Lasers; (2001) https://doi.org/10.1117/12.417702
Event: Laser Optics 2000, 2000, St. Petersburg, Russian Federation
Abstract
There are several key engineering and physical issues for the development of Krypton Fluoride driver for Inertial Fusion Energy Program. In the frame of this program we have performed experiments with e-beam-pumped KrF laser installation GARPUN on the transportation of relativistic e- beams through aluminum-beryllium and titanium foils and compared them with Monte Carlo numerical calculations. It was shown that 50-micrometers thickness Al-Be and 20-micrometers Ti foils had equal transmittance of 75% for approximately 300 keV, 50 kA/cm2, 100 ns e-beams, being lower than calculated one. In contrast to Ti foil, which surface was strongly etched by fluorine, no surface modification and no fatal damages were observed for Al-Be foils after approximately 1000 laser shots and protracted fluorine exposure. It was shown that applied magnetic field of approximately 1 kGs significantly reduced electron scattering both across and along laser cell at typical pumping conditions with 1.5-atm pressure working gas. The energy fluence of scattered electrons fell down from approximately 100 mJ/cm2 to approximately 1 mJ/cm2 per pulse at 8.5-cm distance from the boundary of injected e-beams. Without magnetic field the scattered electrons were spread up to 20 cm, thus strongly irradiating optical windows and being a cause of additional induced absorption of laser radiation.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vladimir D. Zvorykin, Vladimir D. Zvorykin, S. V. Arlantsev, S. V. Arlantsev, Valerii G. Bakaev, Valerii G. Bakaev, O. V. Rantsev, O. V. Rantsev, Gleb V. Sychugov, Gleb V. Sychugov, A. Yu. Tserkovnikov, A. Yu. Tserkovnikov, } "Electron beam transport and foil stability in high-energy e-beam-pumped KrF lasers", Proc. SPIE 4351, Laser Optics 2000: High-Power Gas Lasers, (1 March 2001); doi: 10.1117/12.417702; https://doi.org/10.1117/12.417702
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