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American Institute of Physics, Review of Scientific Instruments, 12(93), 2022

DOI: 10.1063/5.0106696

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Optimized x-ray emission from 10 ns long germanium x-ray sources at the National Ignition Facility

Journal article published in 2022 by K. Werellapatha ORCID, G. N. Hall ORCID, C. Krauland ORCID, A. Krygier ORCID, N. Bhandarkar ORCID, D. K. Bradley ORCID, F. Coppari ORCID, M. G. Gorman ORCID, C. Heinbockel ORCID, G. E. Kemp ORCID, S. F. Khan ORCID, A. Lazicki, N. Masters, M. J. May ORCID, S. R. Nagel ORCID and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

This study investigates methods to optimize quasi-monochromatic, ∼10 ns long x-ray sources (XRS) for time-resolved x-ray diffraction measurements of phase transitions during dynamic laser compression measurements at the National Ignition Facility (NIF). To support this, we produce continuous and pulsed XRS by irradiating a Ge foil with NIF lasers to achieve an intensity of 2 × 1015 W/cm2, optimizing the laser-to-x-ray conversion efficiency. Our x-ray source is dominated by Ge He-α line emission. We discuss methods to optimize the source to maintain a uniform XRS for ∼10 ns, mitigating cold plasma and higher energy x-ray emission lines.