A 7.2 keV spherical x-ray crystal backlighter for two-frame, two-color backlighting at Sandia’s Z Pulsed Power Facility

Schollmeier, M. S.; Knapp, P. F.; Ampleford, D. J.; Harding, E. C.; Jennings, C. A.; Lamppa, D. C.; Loisel, G. P.; Martin, M. R.; Robertson, G. K.; Shores, J. E.; Smith, I. C.; Speas, C. S.; Weis, M. R.; Porter, J. L.; McBride, R. D.

doi:10.1063/1.4994566

A 7.2 keV spherical x-ray crystal backlighter for two-frame, two-color backlighting at Sandia’s Z Pulsed Power Facility

Journal Article · Tue Oct 10 00:00:00 EDT 2017 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4994566· OSTI ID:1441469

^[1]; ^[1]; ^[1]; Harding, E. C. ^[1]; Jennings, C. A. ^[1]; Lamppa, D. C. ^[1]; Loisel, G. P. ^[1]; Martin, M. R. ^[1]; Robertson, G. K. ^[1]; Shores, J. E. ^[1]; Smith, I. C. ^[1]; Speas, C. S. ^[1]; ^[1]; Porter, J. L. ^[1]; McBride, R. D. ^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States). Nuclear Engineering and Radiological Sciences Department

Many experiments on Sandia National Laboratories’ Z Pulsed Power Facility—a 30 MA, 100 ns rise-time, pulsed-power driver—use a monochromatic quartz crystal backlighter system at 1.865 keV (Si He_α) or 6.151 keV (Mn He_α) x-ray energy to radiograph an imploding liner (cylindrical tube) or wire array z-pinch. The x-ray source is generated by the Z-Beamlet laser, which provides two 527-nm, 1 kJ, 1-ns laser pulses. Radiographs of imploding, thick-walled beryllium liners at convergence ratios C_R above 15 [C_R=r_i(0)/r_i(t)] using the 6.151-keV backlighter system were too opaque to identify the inner radius ri of the liner with high confidence, demonstrating the need for a higher-energy x-ray radiography system. Here, we present a 7.242 keV backlighter system using a Ge(335) spherical crystal with the Co He_α resonance line. This system operates at a similar Bragg angle as the existing 1.865 keV and 6.151 keV backlighters, enhancing our capabilities for two-color, two-frame radiography without modifying the system integration at Z. The first data taken at Z include 6.2-keV and 7.2-keV two-color radiographs as well as radiographs of low-convergence (C_R about 4-5), high-areal-density liner implosions.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

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

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1441469

Alternate ID(s):: OSTI ID: 1398821

Report Number(s):: SAND--2018-4422J; 662628

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 88; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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Megagauss-level magnetic field production in cm-scale auto-magnetizing helical liners pulsed to 500 kA in 125 ns Shipley, G. A.; Awe, T. J.; Hutsel, B. T. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5028142	journal	May 2018
The Crystal Backlighter Imager: A spherically bent crystal imager for radiography on the National Ignition Facility Hall, G. N.; Krauland, C. M.; Schollmeier, M. S. Review of Scientific Instruments, Vol. 90, Issue 1 https://doi.org/10.1063/1.5058700	journal	January 2019
Implosion of auto-magnetizing helical liners on the Z facility Shipley, G. A.; Awe, T. J.; Hutsel, B. T. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5089468	journal	May 2019

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A 7.2 keV spherical x-ray crystal backlighter for two-frame, two-color backlighting at Sandia’s Z Pulsed Power Facility

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