Resolving hot spot microstructure using x-ray penumbral imaging (invited)

Bachmann, B.; Hilsabeck, T.; Field, J.; Masters, N.; Reed, C.; Pardini, T.; Rygg, J. R.; Alexander, N.; Benedetti, L. R.; Döppner, T.; Forsman, A.; Izumi, N.; LePape, S.; Ma, T.; MacPhee, A. G.; Nagel, S.; Patel, P.; Spears, B.; Landen, O. L.

doi:10.1063/1.4959161

Resolving hot spot microstructure using x-ray penumbral imaging (invited)

Journal Article · Fri Aug 05 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4959161· OSTI ID:1466905

Bachmann, B. ^[1]; Hilsabeck, T. ^[2]; Field, J. ^[1]; Masters, N. ^[1]; ^[2]; Pardini, T. ^[1]; Rygg, J. R. ^[1]; Alexander, N. ^[2]; Benedetti, L. R. ^[1]; Döppner, T. ^[1]; Forsman, A. ^[2]; Izumi, N. ^[1]; LePape, S. ^[1]; Ma, T. ^[1]; MacPhee, A. G. ^[1]; ^[1]; Patel, P. ^[1]; Spears, B. ^[1]; ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)

Here, we have developed and fielded x-ray penumbral imaging on the National Ignition Facility in order to enable sub-10 μm resolution imaging of stagnated plasma cores (hot spots) of spherically shock compressed spheres and shell implosion targets. By utilizing circular tungsten and tantalum apertures with diameters ranging from 20 μm to 2 mm, in combination with image plate and gated x-ray detectors as well as imaging magnifications ranging from 4 to 64, we have demonstrated high-resolution imaging of hot spot plasmas at x-ray energies above 5 keV. Here we give an overview of the experimental design criteria involved and demonstrate the most relevant influences on the reconstruction of x-ray penumbral images, as well as mitigation strategies of image degrading effects like over-exposed pixels, artifacts, and photon limited source emission. We describe experimental results showing the advantages of x-ray penumbral imaging over conventional Fraunhofer and photon limited pinhole imaging and showcase how internal hot spot microstructures can be resolved.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1466905

Alternate ID(s):: OSTI ID: 22596544
OSTI ID: 1389991

Report Number(s):: LLNL-JRNL--745745; 930316

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748; ISSN RSINAK

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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A near one-dimensional indirectly driven implosion at convergence ratio 30 MacLaren, S. A.; Masse, L. P.; Czajka, C. E. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017976	journal	May 2018
Using time-resolved penumbral imaging to measure low hot spot x-ray emission signals from capsule implosions at the National Ignition Facility Bishel, D. T.; Bachmann, B.; Yi, A. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5037073	journal	October 2018
A Wolter imager on the Z machine to diagnose warm x-ray sources Fein, J. R.; Ampleford, D. J.; Vogel, J. K. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038347	journal	October 2018
Turbulent mixing and transition criteria of flows induced by hydrodynamic instabilities Zhou, Ye; Clark, Timothy T.; Clark, Daniel S. Physics of Plasmas, Vol. 26, Issue 8 https://doi.org/10.1063/1.5088745	journal	August 2019
Implosion performance of subscale beryllium capsules on the NIF Zylstra, A. B.; MacLaren, S.; Yi, S. A. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5098319	journal	May 2019
X-ray penumbral imaging diagnostic developments at the National Ignition Facility Felker, Sean J.; Bachmann, Benjamin; Abu Shawareb, Hatim Target Diagnostics Physics and Engineering for Inertial Confinement Fusion VI https://doi.org/10.1117/12.2274611	conference	September 2017

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