skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on February 5, 2021

Title: Inferred UV fluence focal-spot profiles from soft x-ray pinhole-camera measurements on OMEGA

Abstract

A method was developed with laser-irradiated Au planar foils to characterize the focal spot of UV laser beams on target at full energy from soft x-ray emission. A pinhole camera with a back-thinned charge-coupled–device detector and filtration with thin Be and Al foil filters provides images of the x-ray emission at photon energies <2 keV. This method requires a careful measurement of the relation between the applied UV fluence and the x-ray signal, which can be described by a power-law dependence. The measured exponent γ ~ 2 provides a dynamic range of ~25 for the inferred UV fluence. UV fluence profiles of selected beams were measured for 100-ps and 1-ns laser pulses and were compared to directly measured profiles from an UV equivalent-target-plane diagnostic. The inferred spot size and super-Gaussian order from the x-ray technique agree within several percent with the values measured with the direct UV measurements.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1598519
Alternate Identifier(s):
OSTI ID: 1597538
Report Number(s):
[2019-242; 1548; 2505]
[Journal ID: ISSN 0034-6748; 2019-242, 1548, 2505]
Grant/Contract Number:  
[NA0003856]
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
[ Journal Volume: 91; Journal Issue: 2]; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Theobald, W., Sorce, C., Donaldson, W. R., Epstein, R., Keck, R. L., Kellogg, C., Kessler, T. J., Kwiatkowski, J., Marshall, F. J., Sampat, S., Seka, W., Shah, R. C., Shvydky, A., Stoeckl, C., Waxer, L. J., and Regan, S. P. Inferred UV fluence focal-spot profiles from soft x-ray pinhole-camera measurements on OMEGA. United States: N. p., 2020. Web. doi:10.1063/1.5120708.
Theobald, W., Sorce, C., Donaldson, W. R., Epstein, R., Keck, R. L., Kellogg, C., Kessler, T. J., Kwiatkowski, J., Marshall, F. J., Sampat, S., Seka, W., Shah, R. C., Shvydky, A., Stoeckl, C., Waxer, L. J., & Regan, S. P. Inferred UV fluence focal-spot profiles from soft x-ray pinhole-camera measurements on OMEGA. United States. doi:10.1063/1.5120708.
Theobald, W., Sorce, C., Donaldson, W. R., Epstein, R., Keck, R. L., Kellogg, C., Kessler, T. J., Kwiatkowski, J., Marshall, F. J., Sampat, S., Seka, W., Shah, R. C., Shvydky, A., Stoeckl, C., Waxer, L. J., and Regan, S. P. Wed . "Inferred UV fluence focal-spot profiles from soft x-ray pinhole-camera measurements on OMEGA". United States. doi:10.1063/1.5120708.
@article{osti_1598519,
title = {Inferred UV fluence focal-spot profiles from soft x-ray pinhole-camera measurements on OMEGA},
author = {Theobald, W. and Sorce, C. and Donaldson, W. R. and Epstein, R. and Keck, R. L. and Kellogg, C. and Kessler, T. J. and Kwiatkowski, J. and Marshall, F. J. and Sampat, S. and Seka, W. and Shah, R. C. and Shvydky, A. and Stoeckl, C. and Waxer, L. J. and Regan, S. P.},
abstractNote = {A method was developed with laser-irradiated Au planar foils to characterize the focal spot of UV laser beams on target at full energy from soft x-ray emission. A pinhole camera with a back-thinned charge-coupled–device detector and filtration with thin Be and Al foil filters provides images of the x-ray emission at photon energies <2 keV. This method requires a careful measurement of the relation between the applied UV fluence and the x-ray signal, which can be described by a power-law dependence. The measured exponent γ ~ 2 provides a dynamic range of ~25 for the inferred UV fluence. UV fluence profiles of selected beams were measured for 100-ps and 1-ns laser pulses and were compared to directly measured profiles from an UV equivalent-target-plane diagnostic. The inferred spot size and super-Gaussian order from the x-ray technique agree within several percent with the values measured with the direct UV measurements.},
doi = {10.1063/1.5120708},
journal = {Review of Scientific Instruments},
number = [2],
volume = [91],
place = {United States},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on February 5, 2021
Publisher's Version of Record

Save / Share:

Works referenced in this record:

Direct-drive inertial confinement fusion: A review
journal, November 2015

  • Craxton, R. S.; Anderson, K. S.; Boehly, T. R.
  • Physics of Plasmas, Vol. 22, Issue 11
  • DOI: 10.1063/1.4934714

National direct-drive program on OMEGA and the National Ignition Facility
journal, October 2016


Laser-direct-drive program: Promise, challenge, and path forward
journal, March 2017

  • Campbell, E. M.; Goncharov, V. N.; Sangster, T. C.
  • Matter and Radiation at Extremes, Vol. 2, Issue 2
  • DOI: 10.1016/j.mre.2017.03.001

The National Direct-Drive Program: OMEGA to the National Ignition Facility
journal, December 2017


The National Direct-Drive Inertial Confinement Fusion Program
journal, December 2018


Three-dimensional modeling of the neutron spectrum to infer plasma conditions in cryogenic inertial confinement fusion implosions
journal, April 2018

  • Weilacher, F.; Radha, P. B.; Forrest, C.
  • Physics of Plasmas, Vol. 25, Issue 4
  • DOI: 10.1063/1.5016856

Measurements of the ablation-front trajectory and low-mode nonuniformity in direct-drive implosions using x-ray self-emission shadowgraphy
journal, January 2015

  • Michel, D. T.; Davis, A. K.; Armstrong, W.
  • High Power Laser Science and Engineering, Vol. 3
  • DOI: 10.1017/hpl.2015.15

A framed, 16-image Kirkpatrick–Baez x-ray microscope
journal, September 2017

  • Marshall, F. J.; Bahr, R. E.; Goncharov, V. N.
  • Review of Scientific Instruments, Vol. 88, Issue 9
  • DOI: 10.1063/1.5000737

The single-line-of-sight, time-resolved x-ray imager diagnostic on OMEGA
journal, October 2018

  • Theobald, W.; Sorce, C.; Bedzyk, M.
  • Review of Scientific Instruments, Vol. 89, Issue 10
  • DOI: 10.1063/1.5036767

Three-dimensional modeling of direct-drive cryogenic implosions on OMEGA
journal, May 2016

  • Igumenshchev, I. V.; Goncharov, V. N.; Marshall, F. J.
  • Physics of Plasmas, Vol. 23, Issue 5
  • DOI: 10.1063/1.4948418

A self-calibrating, multichannel streak camera for inertial confinement fusion applications
journal, July 2002

  • Donaldson, W. R.; Boni, R.; Keck, R. L.
  • Review of Scientific Instruments, Vol. 73, Issue 7
  • DOI: 10.1063/1.1482155

A picosecond beam-timing system for the OMEGA laser
journal, May 2016

  • Donaldson, W. R.; Katz, J.; Huff, R.
  • Review of Scientific Instruments, Vol. 87, Issue 5
  • DOI: 10.1063/1.4952440

Direct-drive-implosion experiments with enhanced fluence balance on OMEGA
journal, January 2004

  • Marshall, F. J.; Delettrez, J. A.; Epstein, R.
  • Physics of Plasmas, Vol. 11, Issue 1
  • DOI: 10.1063/1.1628234

In situ characterization of high-intensity laser beams on OMEGA
journal, July 2005

  • Forties, R. A.; Marshall, F. J.
  • Review of Scientific Instruments, Vol. 76, Issue 7
  • DOI: 10.1063/1.1947782

SPECT3D – A multi-dimensional collisional-radiative code for generating diagnostic signatures based on hydrodynamics and PIC simulation output
journal, May 2007


In-tank, on-shot characterization of the OMEGA laser system focal spot
conference, March 2019

  • Waxer, Leon J.; Bauer, Katelynn; Cost, Emil
  • High Power Lasers for Fusion Research V
  • DOI: 10.1117/12.2506792

Reduction of laser imprinting using polarization smoothing on a solid-state fusion laser
journal, April 1999

  • Boehly, T. R.; Smalyuk, V. A.; Meyerhofer, D. D.
  • Journal of Applied Physics, Vol. 85, Issue 7
  • DOI: 10.1063/1.369702

Mean energy required to produce an electron-hole pair in silicon for photons of energies between 50 and 1500 eV
journal, September 1998

  • Scholze, F.; Rabus, H.; Ulm, G.
  • Journal of Applied Physics, Vol. 84, Issue 5
  • DOI: 10.1063/1.368398