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Title: Short pulse, high resolution, backlighters for point projection high-energy radiography at the National Ignition Facility

Abstract

High-resolution, high-energy X-ray backlighters are very active area of research for radiography experiments at the National Ignition Facility (NIF) [Miller et al., Nucl. Fusion 44, S228 (2004)], in particular those aiming at obtaining Compton-scattering produced radiographs from the cold, dense fuel surrounding the hot spot. We report on experiments to generate and characterize point-projection-geometry backlighters using short pulses from the advanced radiographic capability (ARC) [Crane et al., J. Phys. 244, 032003 (2010); Di Nicola et al., Proc. SPIE 2015, 93450I-12], at the NIF, focused on Au micro-wires. We show the first hard X-ray radiographs, at photon energies exceeding 60 keV, of static objects obtained with 30 ps-long ARC laser pulses, and the measurements of strength of the X-ray emission, the pulse duration and the source size of the Au micro-wire backlighters. For the latter, a novel technique has been developed and successfully applied.

Authors:
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  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
OSTI Identifier:
1361877
Alternate Identifier(s):
OSTI ID: 1374520; OSTI ID: 1421174
Report Number(s):
LLNL-JRNL-734514
Journal ID: ISSN 1070-664X
Grant/Contract Number:
AC52-07NA27344
Resource Type:
Journal Article: Published Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; radiography; gold; photons; image sensors; hard X-rays

Citation Formats

Tommasini, R., Bailey, C., Bradley, D. K., Bowers, M., Chen, H., Di Nicola, J. M., Di Nicola, P., Gururangan, G., Hall, G. N., Hardy, C. M., Hargrove, D., Hermann, M., Hohenberger, M., Holder, J. P., Hsing, W., Izumi, N., Kalantar, D., Khan, S., Kroll, J., Landen, O. L., Lawson, J., Martinez, D., Masters, N., Nafziger, J. R., Nagel, S. R., Nikroo, A., Okui, J., Palmer, D., Sigurdsson, R., Vonhof, S., Wallace, R. J., and Zobrist, T. Short pulse, high resolution, backlighters for point projection high-energy radiography at the National Ignition Facility. United States: N. p., 2017. Web. doi:10.1063/1.4983137.
Tommasini, R., Bailey, C., Bradley, D. K., Bowers, M., Chen, H., Di Nicola, J. M., Di Nicola, P., Gururangan, G., Hall, G. N., Hardy, C. M., Hargrove, D., Hermann, M., Hohenberger, M., Holder, J. P., Hsing, W., Izumi, N., Kalantar, D., Khan, S., Kroll, J., Landen, O. L., Lawson, J., Martinez, D., Masters, N., Nafziger, J. R., Nagel, S. R., Nikroo, A., Okui, J., Palmer, D., Sigurdsson, R., Vonhof, S., Wallace, R. J., & Zobrist, T. Short pulse, high resolution, backlighters for point projection high-energy radiography at the National Ignition Facility. United States. doi:10.1063/1.4983137.
Tommasini, R., Bailey, C., Bradley, D. K., Bowers, M., Chen, H., Di Nicola, J. M., Di Nicola, P., Gururangan, G., Hall, G. N., Hardy, C. M., Hargrove, D., Hermann, M., Hohenberger, M., Holder, J. P., Hsing, W., Izumi, N., Kalantar, D., Khan, S., Kroll, J., Landen, O. L., Lawson, J., Martinez, D., Masters, N., Nafziger, J. R., Nagel, S. R., Nikroo, A., Okui, J., Palmer, D., Sigurdsson, R., Vonhof, S., Wallace, R. J., and Zobrist, T. Tue . "Short pulse, high resolution, backlighters for point projection high-energy radiography at the National Ignition Facility". United States. doi:10.1063/1.4983137.
@article{osti_1361877,
title = {Short pulse, high resolution, backlighters for point projection high-energy radiography at the National Ignition Facility},
author = {Tommasini, R. and Bailey, C. and Bradley, D. K. and Bowers, M. and Chen, H. and Di Nicola, J. M. and Di Nicola, P. and Gururangan, G. and Hall, G. N. and Hardy, C. M. and Hargrove, D. and Hermann, M. and Hohenberger, M. and Holder, J. P. and Hsing, W. and Izumi, N. and Kalantar, D. and Khan, S. and Kroll, J. and Landen, O. L. and Lawson, J. and Martinez, D. and Masters, N. and Nafziger, J. R. and Nagel, S. R. and Nikroo, A. and Okui, J. and Palmer, D. and Sigurdsson, R. and Vonhof, S. and Wallace, R. J. and Zobrist, T.},
abstractNote = {High-resolution, high-energy X-ray backlighters are very active area of research for radiography experiments at the National Ignition Facility (NIF) [Miller et al., Nucl. Fusion 44, S228 (2004)], in particular those aiming at obtaining Compton-scattering produced radiographs from the cold, dense fuel surrounding the hot spot. We report on experiments to generate and characterize point-projection-geometry backlighters using short pulses from the advanced radiographic capability (ARC) [Crane et al., J. Phys. 244, 032003 (2010); Di Nicola et al., Proc. SPIE 2015, 93450I-12], at the NIF, focused on Au micro-wires. We show the first hard X-ray radiographs, at photon energies exceeding 60 keV, of static objects obtained with 30 ps-long ARC laser pulses, and the measurements of strength of the X-ray emission, the pulse duration and the source size of the Au micro-wire backlighters. For the latter, a novel technique has been developed and successfully applied.},
doi = {10.1063/1.4983137},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {Tue May 09 00:00:00 EDT 2017},
month = {Tue May 09 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.4983137

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  • High-resolution, high-energy X-ray backlighters are very active area of research for radiography experiments at the National Ignition Facility (NIF) [Miller et al., Nucl. Fusion 44, S228 (2004)], in particular those aiming at obtaining Compton-scattering produced radiographs from the cold, dense fuel surrounding the hot spot. We report on experiments to generate and characterize point-projection-geometry backlighters using short pulses from the advanced radiographic capability (ARC) [Crane et al., J. Phys. 244, 032003 (2010); Di Nicola et al., Proc. SPIE 2015, 93450I-12], at the NIF, focused on Au micro-wires. We show the first hard X-ray radiographs, at photon energies exceeding 60 keV,more » of static objects obtained with 30 ps-long ARC laser pulses, and the measurements of strength of the X-ray emission, the pulse duration and the source size of the Au micro-wire backlighters. For the latter, a novel technique has been developed and successfully applied.« less
  • Cited by 1
  • Multi-keV x-ray microscopy will be an important laser-produced plasma diagnostic at future megajoule facilities such as the National Ignition Facility (NIF). However, laser energies and plasma characteristics imply that x-ray microscopy will be more challenging at NIF than at existing facilities. In earlier work, we concluded that target-mounted pinholes and single spherical or toroidal crystals are good options for many x-ray microscopy applications at NIF. In this article, we review the experimental progress we have made investigating these systems on the Nova and Petawatt Laser Facilities. In particular, we have performed high-resolution, high-magnification target-mounted pinhole imaging of Nova implosions, andmore » we have obtained promising preliminary spherical-crystal data from high-intensity Petawatt experiments. We are also designing a high-energy spherical-crystal imager for use on Nova experiments. {copyright} {ital 1999 American Institute of Physics.}« less
  • In pinhole-assisted point-projection backlighting, pinholes are placed a small distance (of order 1 mm) away from the backlighter source to produce images with large field of view. Pinholes placed close to high-power backlighter sources can vaporize and, if sufficiently small, close due to x-ray driven ablation, thereby potentially limiting the usefulness of this method. A study of streaked one-dimensional backlit imaging of 25 {mu}m W wires using the OMEGA laser at the University of Rochester is presented. The pinhole closure time scale for 10 {mu}m pinholes placed 0.45 and 1 mm distant from a 0.6 TW Ti backlighter is 1.3more » and 2.2 ns, respectively. Similar time scales for 5 {mu}m pinholes is also presented. Successful wire imaging prior to pinhole closure is clearly demonstrated.« less
  • With the completion of the Trident laser facility upgrade, 200 TW high-energy laser pulses are now capable of producing x-ray pulses with energies in the range of 15-40 keV, which will be used for high-spatial resolution radiography. A diagnostic suite is being developed on the laser system to investigate and characterize the x-ray emission from high-Z targets. This includes charge coupled device based single-photon counters, imaging plates, a high-energy electronic imager, spectral diagnostics, and optical and x-ray spot size diagnostics. We describe recent x-ray results from a commissioning campaign as well as describe the development and design of a high-energymore » spectrometer. X-ray radiographs taken at 22 keV with a spatial resolution of 25 {mu}m are a first demonstration on this facility of high-energy, high-spatial resolution capability.« less