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

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.

doi:10.1063/1.5120708

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:

Theobald, W. ^[1]; Sorce, C. ^[1];

^[1];

^[1]; Keck, R. L. ^[1]; Kellogg, C. ^[1]; Kessler, T. J. ^[1]; Kwiatkowski, J. ^[1]; Marshall, F. J. ^[1]; Sampat, S. ^[1]; Seka, W. ^[1]; Shah, R. C. ^[1]; Shvydky, A. ^[1]; Stoeckl, C. ^[1]; Waxer, L. J. ^[1]; Regan, S. P. ^[1]

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

Publication Date:: Wed Feb 05 00:00:00 EST 2020

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; TRN: US2103300

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.

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                    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.  https://doi.org/10.1063/1.5120708

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                    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.  https://doi.org/10.1063/1.5120708.  https://www.osti.gov/servlets/purl/1598519.

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@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         = {Wed Feb 05 00:00:00 EST 2020},

  month        = {Wed Feb 05 00:00:00 EST 2020}

}

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

Abstract

Citation Formats

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

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

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

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

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

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

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

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

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

Analysis of trends in experimental observables: Reconstruction of the implosion dynamics and implications for fusion yield extrapolation for direct-drive cryogenic targets on OMEGA journal, June 2018

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Analysis of trends in experimental observables: Reconstruction of the implosion dynamics and implications for fusion yield extrapolation for direct-drive cryogenic targets on OMEGA
journal, June 2018

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

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journal, April 2018

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

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

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

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

Publisher’s Note: Demonstration of Fuel Hot-Spot Pressure in Excess of 50 Gbar for Direct-Drive, Layered Deuterium-Tritium Implosions on OMEGA [Phys. Rev. Lett. 117 , 025001 (2016)]
journal, July 2016

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journal, May 2016

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journal, September 2017

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