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Title: Beryllium liner implosion experiments on the Z accelerator in preparation for magnetized liner inertial fusion

Abstract

Multiple experimental campaigns have been executed to study the implosions of initially solid beryllium (Be) liners (tubes) on the Z pulsed-power accelerator. The implosions were driven by current pulses that rose from 0 to 20 MA in either 100 or 200 ns (200 ns for pulse shaping experiments). These studies were conducted in support of the recently proposed Magnetized Liner Inertial Fusion concept [Slutz et al., Phys. Plasmas 17, 056303 (2010)], as well as for exploring novel equation-of-state measurement techniques. The experiments used thick-walled liners that had an aspect ratio (initial outer radius divided by initial wall thickness) of either 3.2, 4, or 6. From these studies, we present three new primary results. First, we present radiographic images of imploding Be liners, where each liner contained a thin aluminum sleeve for enhancing the contrast and visibility of the liner's inner surface in the images. These images allow us to assess the stability of the liner's inner surface more accurately and more directly than was previously possible. Second, we present radiographic images taken early in the implosion (prior to any motion of the liner's inner surface) of a shockwave propagating radially inward through the liner wall. Radial mass density profiles frommore » these shock compression experiments are contrasted with profiles from experiments where the Z accelerator's pulse shaping capabilities were used to achieve shockless (“quasi-isentropic”) liner compression. Third, we present “micro-B-dot ” measurements of azimuthal magnetic field penetration into the initially vacuum-filled interior of a shocked liner. Our measurements and simulations reveal that the penetration commences shortly after the shockwave breaks out from the liner's inner surface. The field then accelerates this low-density “precursor” plasma to the axis of symmetry.« less

Authors:
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  1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
Publication Date:
OSTI Identifier:
22228098
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 20; Journal Issue: 5; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM; ASPECT RATIO; BERYLLIUM; COMPRESSION; EQUATIONS OF STATE; ICF DEVICES; INERTIAL CONFINEMENT; INERTIAL FUSION DRIVERS; LASER IMPLOSIONS; LASER-PRODUCED PLASMA; MAGNETIC FIELDS; PLASMA GUNS; PLASMA SIMULATION; SHOCK WAVES; WALL EFFECTS

Citation Formats

McBride, R. D., Martin, M. R., Lemke, R. W., Jennings, C. A., Rovang, D. C., Sinars, D. B., Cuneo, M. E., Herrmann, M. C., Slutz, S. A., Nakhleh, C. W., Davis, J.-P., Flicker, D. G., Rogers, T. J., Robertson, G. K., Kamm, R. J., Smith, I. C., Savage, M., Stygar, W. A., Rochau, G. A., Jones, M., and and others. Beryllium liner implosion experiments on the Z accelerator in preparation for magnetized liner inertial fusion. United States: N. p., 2013. Web. doi:10.1063/1.4803079.
McBride, R. D., Martin, M. R., Lemke, R. W., Jennings, C. A., Rovang, D. C., Sinars, D. B., Cuneo, M. E., Herrmann, M. C., Slutz, S. A., Nakhleh, C. W., Davis, J.-P., Flicker, D. G., Rogers, T. J., Robertson, G. K., Kamm, R. J., Smith, I. C., Savage, M., Stygar, W. A., Rochau, G. A., Jones, M., & and others. Beryllium liner implosion experiments on the Z accelerator in preparation for magnetized liner inertial fusion. United States. doi:10.1063/1.4803079.
McBride, R. D., Martin, M. R., Lemke, R. W., Jennings, C. A., Rovang, D. C., Sinars, D. B., Cuneo, M. E., Herrmann, M. C., Slutz, S. A., Nakhleh, C. W., Davis, J.-P., Flicker, D. G., Rogers, T. J., Robertson, G. K., Kamm, R. J., Smith, I. C., Savage, M., Stygar, W. A., Rochau, G. A., Jones, M., and and others. Wed . "Beryllium liner implosion experiments on the Z accelerator in preparation for magnetized liner inertial fusion". United States. doi:10.1063/1.4803079.
@article{osti_22228098,
title = {Beryllium liner implosion experiments on the Z accelerator in preparation for magnetized liner inertial fusion},
author = {McBride, R. D. and Martin, M. R. and Lemke, R. W. and Jennings, C. A. and Rovang, D. C. and Sinars, D. B. and Cuneo, M. E. and Herrmann, M. C. and Slutz, S. A. and Nakhleh, C. W. and Davis, J.-P. and Flicker, D. G. and Rogers, T. J. and Robertson, G. K. and Kamm, R. J. and Smith, I. C. and Savage, M. and Stygar, W. A. and Rochau, G. A. and Jones, M. and and others},
abstractNote = {Multiple experimental campaigns have been executed to study the implosions of initially solid beryllium (Be) liners (tubes) on the Z pulsed-power accelerator. The implosions were driven by current pulses that rose from 0 to 20 MA in either 100 or 200 ns (200 ns for pulse shaping experiments). These studies were conducted in support of the recently proposed Magnetized Liner Inertial Fusion concept [Slutz et al., Phys. Plasmas 17, 056303 (2010)], as well as for exploring novel equation-of-state measurement techniques. The experiments used thick-walled liners that had an aspect ratio (initial outer radius divided by initial wall thickness) of either 3.2, 4, or 6. From these studies, we present three new primary results. First, we present radiographic images of imploding Be liners, where each liner contained a thin aluminum sleeve for enhancing the contrast and visibility of the liner's inner surface in the images. These images allow us to assess the stability of the liner's inner surface more accurately and more directly than was previously possible. Second, we present radiographic images taken early in the implosion (prior to any motion of the liner's inner surface) of a shockwave propagating radially inward through the liner wall. Radial mass density profiles from these shock compression experiments are contrasted with profiles from experiments where the Z accelerator's pulse shaping capabilities were used to achieve shockless (“quasi-isentropic”) liner compression. Third, we present “micro-B-dot ” measurements of azimuthal magnetic field penetration into the initially vacuum-filled interior of a shocked liner. Our measurements and simulations reveal that the penetration commences shortly after the shockwave breaks out from the liner's inner surface. The field then accelerates this low-density “precursor” plasma to the axis of symmetry.},
doi = {10.1063/1.4803079},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 20,
place = {United States},
year = {2013},
month = {5}
}