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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States). Nuclear Engineering and Radiological Sciences Department
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1441469
Alternate Identifier(s):
OSTI ID: 1398821
Report Number(s):
SAND-2018-4422J
Journal ID: ISSN 0034-6748; 662628
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 88; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 42 ENGINEERING; 36 MATERIALS SCIENCE

Citation Formats

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., and McBride, R. D. A 7.2 keV spherical x-ray crystal backlighter for two-frame, two-color backlighting at Sandia’s Z Pulsed Power Facility. United States: N. p., 2017. Web. doi:10.1063/1.4994566.
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. A 7.2 keV spherical x-ray crystal backlighter for two-frame, two-color backlighting at Sandia’s Z Pulsed Power Facility. United States. doi:10.1063/1.4994566.
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., and McBride, R. D. Tue . "A 7.2 keV spherical x-ray crystal backlighter for two-frame, two-color backlighting at Sandia’s Z Pulsed Power Facility". United States. doi:10.1063/1.4994566. https://www.osti.gov/servlets/purl/1441469.
@article{osti_1441469,
title = {A 7.2 keV spherical x-ray crystal backlighter for two-frame, two-color backlighting at Sandia’s Z Pulsed Power Facility},
author = {Schollmeier, M. S. and Knapp, P. F. and Ampleford, D. J. and Harding, E. C. and Jennings, C. A. and Lamppa, D. C. and Loisel, G. P. and Martin, M. R. and Robertson, G. K. and Shores, J. E. and Smith, I. C. and Speas, C. S. and Weis, M. R. and Porter, J. L. and McBride, R. D.},
abstractNote = {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 Heα) or 6.151 keV (Mn Heα) 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 CR above 15 [CR=ri(0)/ri(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 Heα 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 (CR about 4-5), high-areal-density liner implosions.},
doi = {10.1063/1.4994566},
journal = {Review of Scientific Instruments},
number = 10,
volume = 88,
place = {United States},
year = {2017},
month = {10}
}

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