Dynamics and energy coupling of gas puff Z-pinches on a fast linear transformer driver

Conti, F.; Narkis, J.; Williams, A.; Fadeev, V.; Beg, F. N.

doi:10.1063/5.0051335

Title: Dynamics and energy coupling of gas puff Z-pinches on a fast linear transformer driver

Journal Article · Thu Jul 08 00:00:00 EDT 2021 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0051335· OSTI ID:1850368

^[1];

^[1]; Williams, A. ^[1]; Fadeev, V. ^[1]; Beg, F. N. ^[1]

Univ. of California, San Diego, La Jolla, CA (United States). Center for Energy Research

Gas puff Z-pinch experiments with annular Ar and Ne gas shells have been conducted on the Compact Experimental System for Z-pinch and Ablation Research (CESZAR) linear transformer driver (LTD) with 500 kA current and 160 ns rise time. Here, we present results from the first systematic gas puff Z-pinch experiments using a fast (≤ 200 ns) LTD as a driver, in which we show that 7% of the stored energy in the capacitors is coupled to plasma kinetic energy as estimated via self-emission and laser schlieren images. 0D and 1D simulations—which do not allow instability growth and thus reach greater maximum average velocities—using initial conditions inferred from experimental implosion trajectories predict coupling in excess of 10% of the stored energy. Additionally, the Ar and Ne implosions were comparably massed and thus achieved similar maximum kinetic energies, though the Ne pinches were more stable and the x-ray pulses were longer and produced higher yield: 2–5 ns and 0.21–0.52 J (0.15–0.37 J/cm) of Ar K-shell and 12–25 ns and 2.2–3.9 J (1.6–2.6 J/cm) of Ne K-shell, respectively. The difference in stability is most likely attributed to variations in initial conditions such as density distribution and gas breakdown initiation.

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Research Organization:: Univ. of California, San Diego, CA (United States)

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

Grant/Contract Number:: NA0003842

OSTI ID:: 1850368

Alternate ID(s):: OSTI ID: 1806359

Journal Information:: Journal of Applied Physics, Vol. 130, Issue 2; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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