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Title: Implosion dynamics of triple-nozzle gas-puff z pinches on COBRA

Abstract

Experiments on the 1-MA, 220-ns COBRA generator at Cornell University were conducted to provide detailed measurements of structured cylindrical gas-puff z pinches. In the experiments, a 7 cm diameter triple-nozzle gas valve assembly with concentric outer and inner annular nozzles and a central gas jet initialize the z-pinch load with various working gases, radial density profiles, and externally applied axial magnetic fields. Planar laser-induced fluorescence provides a measure of the initial neutral gas density of the load, while three-frame laser shearing interferometry and multi-frame extreme ultraviolet (XUV) cameras reveal the formation and propagation of a magneto-Rayleigh–Taylor (MRT) unstable shock layer. Implosion trajectories are compared to simple, experimentally informed models and found to be in good agreement. Differences in the structure of the accelerating plasma sheath and evolution of the MRT instability are observed for different gas species and axial magnetic field strengths, correlating with differences in pinch uniformity and x-ray emission. Here, the average instability growth is compared to linear MRT theory predictions using the instantaneous acceleration of the best-fit implosion models and characteristic instability wavelength, with the effective Atwood number and seed perturbation size as fit parameters. For high density argon center jets, ionization prior to the arrival ofmore » the imploding plasma sheath suggests a heating mechanism consistent with photoionization by XUV self-emission.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [1];  [1]
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  1. Cornell Univ., Ithaca, NY (United States)
  2. Cornell Univ., Ithaca, NY (United States); L3 Technology, San Leandro, CA (United States)
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1767169
Grant/Contract Number:  
NA0003764
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 28; Journal Issue: 2; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Accelerated plasmas; Photoionization; Interferometry; Gas jet; Plasma sheaths; Thermodynamic properties; Flow visualization; Fluid mechanics; Plasma confinement; Fourier analysis

Citation Formats

Lavine, E. S., Rocco, S. V., Banasek, J. T., Potter, W. M., Greenly, J. B., Wilhelm, H., Qi, N., Hammer, D. A., and Kusse, B. R. Implosion dynamics of triple-nozzle gas-puff z pinches on COBRA. United States: N. p., 2021. Web. doi:10.1063/5.0030936.
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Lavine, E. S., Rocco, S. V., Banasek, J. T., Potter, W. M., Greenly, J. B., Wilhelm, H., Qi, N., Hammer, D. A., & Kusse, B. R. Implosion dynamics of triple-nozzle gas-puff z pinches on COBRA. United States. https://doi.org/10.1063/5.0030936
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Lavine, E. S., Rocco, S. V., Banasek, J. T., Potter, W. M., Greenly, J. B., Wilhelm, H., Qi, N., Hammer, D. A., and Kusse, B. R. Tue . "Implosion dynamics of triple-nozzle gas-puff z pinches on COBRA". United States. https://doi.org/10.1063/5.0030936. https://www.osti.gov/servlets/purl/1767169.
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@article{osti_1767169,
title = {Implosion dynamics of triple-nozzle gas-puff z pinches on COBRA},
author = {Lavine, E. S. and Rocco, S. V. and Banasek, J. T. and Potter, W. M. and Greenly, J. B. and Wilhelm, H. and Qi, N. and Hammer, D. A. and Kusse, B. R.},
abstractNote = {Experiments on the 1-MA, 220-ns COBRA generator at Cornell University were conducted to provide detailed measurements of structured cylindrical gas-puff z pinches. In the experiments, a 7 cm diameter triple-nozzle gas valve assembly with concentric outer and inner annular nozzles and a central gas jet initialize the z-pinch load with various working gases, radial density profiles, and externally applied axial magnetic fields. Planar laser-induced fluorescence provides a measure of the initial neutral gas density of the load, while three-frame laser shearing interferometry and multi-frame extreme ultraviolet (XUV) cameras reveal the formation and propagation of a magneto-Rayleigh–Taylor (MRT) unstable shock layer. Implosion trajectories are compared to simple, experimentally informed models and found to be in good agreement. Differences in the structure of the accelerating plasma sheath and evolution of the MRT instability are observed for different gas species and axial magnetic field strengths, correlating with differences in pinch uniformity and x-ray emission. Here, the average instability growth is compared to linear MRT theory predictions using the instantaneous acceleration of the best-fit implosion models and characteristic instability wavelength, with the effective Atwood number and seed perturbation size as fit parameters. For high density argon center jets, ionization prior to the arrival of the imploding plasma sheath suggests a heating mechanism consistent with photoionization by XUV self-emission.},
doi = {10.1063/5.0030936},
journal = {Physics of Plasmas},
number = 2,
volume = 28,
place = {United States},
year = {Tue Feb 02 00:00:00 EST 2021},
month = {Tue Feb 02 00:00:00 EST 2021}
}
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