Calibration of the sub-aperture backscatter system on OMEGA EP

Filkins, T.; Rosenberg, M. J.; Bahr, R. E.; Katz, J.; Ivancic, S. T.

doi:10.1063/5.0101839

This content will become publicly available on Sat May 11 00:00:00 EDT 2024

Title: Calibration of the sub-aperture backscatter system on OMEGA EP

Abstract

The sub-aperture backscatter (SABS) diagnostic on the OMEGA EP Laser System is a diagnostic that is used to measure the backscattered and sidescattered light during laser–plasma interaction experiments that are relevant to high-energy-density physics and inertial confinement fusion. The diagnostic collects stimulated Brillouin scattering (SBS) UV light at around 351 nm and stimulated Raman scattering (SRS) in the visible-light regime in the 420–720-nm-wavelength range and provides spectrally and temporally resolved information. Five 1-in. light collectors, composed of a lens, ground glass diffuser, and coupling into a 300-μm fiber, are positioned behind the last steering mirror on one of the four beamlines to catch a portion of the beam cross section (~1.5%) of the emission that is scattered into the beamline. The SRS light is collected in two light collectors, combined, and transported via graded index fibers to a streaked spectrometer. The SABS-SRS streak spectrometer has a temporal and spectral resolution of 100 ps and 1 nm, respectively. Three other light collectors collect, combine, and transport the SBS signal to a Hamamatsu high-voltage photodiode, where an oscilloscope digitizes the data, providing a time resolution of better than 1 ns. To obtain an absolute energy calibration of SRS measurements, light signals of known energy and wavelengthmore »« less

Authors:

^[1];

^[1]; Bahr, R. E. ^[1];

^[1];

^[1]

University of Rochester, NY (United States). Laboratory for Laser Energetics

Publication Date:: Thu May 11 00:00:00 EDT 2023

Research Org.:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); New York State Energy Research and Development Authority; University of Rochester

OSTI Identifier:: 1988225

Grant/Contract Number:: NA0003856

Resource Type:: Accepted Manuscript

Journal Name:: Review of Scientific Instruments

Additional Journal Information:: Journal Volume: 94; Journal Issue: 5; Conference: 24. Topical Conference on High-Temperature Plasma Diagnostics, Rochester, NY (United States), 15-19 May 2022; Journal ID: ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION; ultraviolet light; fiber optics; light scattering; optical devices; Raman scattering; streak cameras; charge coupled devices; high energy density physics; laser plasma interactions; plasma confinement

Citation Formats


                    Filkins, T., Rosenberg, M. J., Bahr, R. E., Katz, J., and Ivancic, S. T. Calibration of the sub-aperture backscatter system on OMEGA EP.  United States: N. p., 2023. 
Web.  doi:10.1063/5.0101839.

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                    Filkins, T., Rosenberg, M. J., Bahr, R. E., Katz, J., & Ivancic, S. T. Calibration of the sub-aperture backscatter system on OMEGA EP.  United States.  https://doi.org/10.1063/5.0101839

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                    Filkins, T., Rosenberg, M. J., Bahr, R. E., Katz, J., and Ivancic, S. T. Thu .  
"Calibration of the sub-aperture backscatter system on OMEGA EP".  United States.  https://doi.org/10.1063/5.0101839.

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@article{osti_1988225,

  title        = {Calibration of the sub-aperture backscatter system on OMEGA EP},

  author       = {Filkins, T. and Rosenberg, M. J. and Bahr, R. E. and Katz, J. and Ivancic, S. T.},

  abstractNote = {The sub-aperture backscatter (SABS) diagnostic on the OMEGA EP Laser System is a diagnostic that is used to measure the backscattered and sidescattered light during laser–plasma interaction experiments that are relevant to high-energy-density physics and inertial confinement fusion. The diagnostic collects stimulated Brillouin scattering (SBS) UV light at around 351 nm and stimulated Raman scattering (SRS) in the visible-light regime in the 420–720-nm-wavelength range and provides spectrally and temporally resolved information. Five 1-in. light collectors, composed of a lens, ground glass diffuser, and coupling into a 300-μm fiber, are positioned behind the last steering mirror on one of the four beamlines to catch a portion of the beam cross section (~1.5%) of the emission that is scattered into the beamline. The SRS light is collected in two light collectors, combined, and transported via graded index fibers to a streaked spectrometer. The SABS-SRS streak spectrometer has a temporal and spectral resolution of 100 ps and 1 nm, respectively. Three other light collectors collect, combine, and transport the SBS signal to a Hamamatsu high-voltage photodiode, where an oscilloscope digitizes the data, providing a time resolution of better than 1 ns. To obtain an absolute energy calibration of SRS measurements, light signals of known energy and wavelength were injected into the light collectors one at a time. The resulting counts on the streak camera charge-coupled device for SRS are then correlated with the incident fluence of scattered light at the light collector in order to allow a quantitative assessment of streak camera sensitivity to determine the energy of the scattered light during experiments. The measurements were performed in situ from the light collectors to the detectors. Other offline measurements provided the transmission of the optics between the target chamber center and the light collectors.},

  doi          = {10.1063/5.0101839},

  journal      = {Review of Scientific Instruments},

  number       = 5,

  volume       = 94,

  place        = {United States},

  year         = {Thu May 11 00:00:00 EDT 2023},

  month        = {Thu May 11 00:00:00 EDT 2023}

}

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Works referenced in this record:

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This content will become publicly available on Sat May 11 00:00:00 EDT 2024

Title: Calibration of the sub-aperture backscatter system on OMEGA EP

Abstract

Citation Formats

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