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

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.

doi:10.1063/5.0030936

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

Journal Article · Tue Feb 02 00:00:00 EST 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0030936· OSTI ID:1767169

^[1];

^[1]; Banasek, J. T. ^[1]; Potter, W. M. ^[1]; Greenly, J. B. ^[1]; Wilhelm, H. ^[1]; Qi, N. ^[2];

^[1]; Kusse, B. R. ^[1]

Cornell Univ., Ithaca, NY (United States)
Cornell Univ., Ithaca, NY (United States); L3 Technology, San Leandro, CA (United States)

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.

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Research Organization:: Cornell Univ., Ithaca, NY (United States)

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

Grant/Contract Number:: NA0003764

OSTI ID:: 1767169

Journal Information:: Physics of Plasmas, Vol. 28, Issue 2; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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