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Title: High-energy differential-filtering photon spectrometer for ultraintense laser-matter interactions

Abstract

Large quantities of ultrahigh-energy x-rays are produced by petawatt-class lasers; however, spectroscopy in this range of 0.1-1 MeV is difficult due to the long photon mean free path. A novel geometry step filter to measure the high-energy bremsstrahlung emission tail has been developed for use in high energy density, short-pulse laser-matter interaction experiments. The grid design of the filters allows for the independent determination of a local background, which reduces systematic errors in the reconstructed spectra. This spectrometer was used to measure x-ray spectra for various laser and target conditions at intensities near 1 × 10 18 W/cm 2 where single-exponential bremsstrahlung spectra were fit to the data and show an increasing photon temperature with pulse duration for a fixed laser intensity.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1545517
Alternate Identifier(s):
OSTI ID: 1476682
Grant/Contract Number:  
AC52-07NA27344; 15-ERD-054; 17-ERD-010
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Williams, G. J., Tommasini, R., Lemos, N., Park, J., and Chen, Hui. High-energy differential-filtering photon spectrometer for ultraintense laser-matter interactions. United States: N. p., 2018. Web. doi:10.1063/1.5039383.
Williams, G. J., Tommasini, R., Lemos, N., Park, J., & Chen, Hui. High-energy differential-filtering photon spectrometer for ultraintense laser-matter interactions. United States. doi:10.1063/1.5039383.
Williams, G. J., Tommasini, R., Lemos, N., Park, J., and Chen, Hui. Mon . "High-energy differential-filtering photon spectrometer for ultraintense laser-matter interactions". United States. doi:10.1063/1.5039383. https://www.osti.gov/servlets/purl/1545517.
@article{osti_1545517,
title = {High-energy differential-filtering photon spectrometer for ultraintense laser-matter interactions},
author = {Williams, G. J. and Tommasini, R. and Lemos, N. and Park, J. and Chen, Hui},
abstractNote = {Large quantities of ultrahigh-energy x-rays are produced by petawatt-class lasers; however, spectroscopy in this range of 0.1-1 MeV is difficult due to the long photon mean free path. A novel geometry step filter to measure the high-energy bremsstrahlung emission tail has been developed for use in high energy density, short-pulse laser-matter interaction experiments. The grid design of the filters allows for the independent determination of a local background, which reduces systematic errors in the reconstructed spectra. This spectrometer was used to measure x-ray spectra for various laser and target conditions at intensities near 1 × 1018 W/cm2 where single-exponential bremsstrahlung spectra were fit to the data and show an increasing photon temperature with pulse duration for a fixed laser intensity.},
doi = {10.1063/1.5039383},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

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