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Abstract <p>Long-lived electron-beam-induced absorption in a number of UV-optical materials for windows and multilayer coatings of inertial fusion energy reactor and promising KrF laser driver was studied using a&#xa0;pulsed linear electron accelerator with electron energy of 10 MeV. In testing high-purity samples of quartz glasses Corning 7980, KU-1, and KS-4V, as well as crystals of calcium fluoride, magnesium fluoride, and leucosapphire the radiation dose of 18.2 MGy, was comparable to the dose absorbed by windows of KrF electron-beam-pumped laser driver operating for 1 year with a pulse repetition rate of&#xa0;5 Hz. Quartz glass KS-4V with an admixture of OH showed the lowest absorption with a coefficient of 0.4 cm<sup>–1</sup> at a wavelength of 248 nm among all other glasses. Rather high absorption with a coefficient of 4 cm<sup>–1</sup> in calcium fluoride is effectively bleached by the own KrF laser radiation.</p>

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Investigation of Radiation Stability of UV Optical Materials for Thermonuclear Power Plant with KrF Laser Driver at a Linear 10-MeV Electron Accelerator. Part II. Electron-Beam Induced Absorption in Samples

  • 期刊论文

  • 发表日期：

    2025年9月21日

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  • V. D. Zvorykin,
  • S. V. Arlantsev,
  • V. V. Khankin,
  • V. I. Shvedunov,
  • N. N. Ustinovskii

摘要

Abstract

Long-lived electron-beam-induced absorption in a number of UV-optical materials for windows and multilayer coatings of inertial fusion energy reactor and promising KrF laser driver was studied using a pulsed linear electron accelerator with electron energy of 10 MeV. In testing high-purity samples of quartz glasses Corning 7980, KU-1, and KS-4V, as well as crystals of calcium fluoride, magnesium fluoride, and leucosapphire the radiation dose of 18.2 MGy, was comparable to the dose absorbed by windows of KrF electron-beam-pumped laser driver operating for 1 year with a pulse repetition rate of 5 Hz. Quartz glass KS-4V with an admixture of OH showed the lowest absorption with a coefficient of 0.4 cm–1 at a wavelength of 248 nm among all other glasses. Rather high absorption with a coefficient of 4 cm–1 in calcium fluoride is effectively bleached by the own KrF laser radiation.