Load dynamics of double planar foil liners and double planar wire arrays on the UM MAIZE LTD generator

Butcher, C. J.; Kantsyrev, V. L.; Safronova, A. S.; Shlyaptseva, V. V.; Shrestha, I. K.; Stafford, A.; Steiner, A. M.; Campbell, P. C.; Miller, S. M.; Yager-Elorriaga, D.; Jordan, N. M.; McBride, R. D.; Gilgenbach, R. M.

doi:10.1063/5.0044058

Title: Load dynamics of double planar foil liners and double planar wire arrays on the UM MAIZE LTD generator

Journal Article · Thu Aug 05 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0044058· OSTI ID:1820408

^[1]; Kantsyrev, V. L. ^[1]; Safronova, A. S. ^[1]; Shlyaptseva, V. V. ^[1]; Shrestha, I. K. ^[1]; Stafford, A. ^[1]; Steiner, A. M. ^[2];

^[3];

^[3]; Yager-Elorriaga, D. ^[2];

^[3];

^[3]

Univ. of Nevada, Reno, NV (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

In previous studies using the University of Nevada, Reno's (UNR's) high-impedance Zebra Marx generator (1.9 Ω, 1.7 MA, 100 ns), Double Planar Wire Arrays (DPWAs) proved to be excellent radiators, and Double Planar Foil Liners (DPFLs) proved useful for future inertial confinement fusion applications. This article presents the results of joint UNR/UM (University of Michigan) experiments with aluminum (Al) DPWAs, Al DPFLs, and tungsten (W) DPWAs using UM's Michigan Accelerator for Inductive Z-Pinch Experiments (MAIZE) generator, a low-impedance Linear Transformer Driver (LTD) (0.1 Ω, 0.5–1 MA, and 100–250 ns). The main goals of this study were twofold: the first was a pioneering effort to test whether a relatively heavy Al DPFL could successfully be imploded on a low-impedance university-scale LTD like the MAIZE generator, and, if so, to analyze the results and make comparisons to the optimized, lighter DPWA configurations that have been previously studied. The DPWAs consisted of two planes of micrometer-scale diameter Al or W wires, while the DPFLs consisted of two planes of micrometer-scale thickness Al foils. Diagnostics include filtered Si-diodes, an absolutely calibrated filtered PCD, x-ray pinhole cameras, spectrometers, and gated optical self-emission imaging. The implosion dynamics and radiative properties of Al DPWAs and DPFLs and W DPWAs on the MAIZE LTD are discussed and compared. Time-dependent load inductance calculations derived from measurements of the load current and a MAIZE circuit model provide a relative measurement of pinch strength. In experiments on MAIZE, W planar wire arrays exhibited a higher peak load inductance throughout the pinch than Al DPWAs and DPFLs, while x-ray pulses from Al DPFLs had the longest emission duration.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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

Grant/Contract Number:: NA0003525; NA0003047; NA0003877

OSTI ID:: 1820408

Report Number(s):: SAND-2021-9207J; 698534; TRN: US2214239

Journal Information:: Physics of Plasmas, Vol. 28, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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