Implosion of auto-magnetizing helical liners on the Z facility

Shipley, Gabriel A.; Awe, Thomas James; Hutsel, Brian Thomas; Greenly, John B.; Jennings, Christopher Ashley; Slutz, Stephen A.

doi:10.1063/1.5089468

Implosion of auto-magnetizing helical liners on the Z facility

Journal Article · Thu May 16 00:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5089468· OSTI ID:1515210

^[1]; Awe, Thomas James ^[2]; ^[2]; Greenly, John B. ^[3]; Jennings, Christopher Ashley ^[2]; ^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Cornell Univ., Ithaca, NY (United States)

In the first auto-magnetizing liner implosion experiments on the Z Facility, precompressed internal axial fields near 150 T were measured and 7.2-keV radiography indicated a high level of cylindrical uniformity of the imploding liner's inner surface. An auto-magnetizing (AutoMag) liner is made of discrete metallic helical conductors encapsulated in insulating material. Here, the liner generates internal axial magnetic field as a 1–2 MA, 100–200 ns current prepulse flows through the helical conductors. After the prepulse, the fast-rising main current pulse causes the insulating material between the metallic helices to break down ceasing axial field production. After breakdown, the helical liner, nonuniform in both density and electrical conductivity, implodes in 100 ns. In-flight radiography data demonstrate that while the inner wall maintains cylindrical uniformity, multiple new helically oriented structures are self-generated within the outer liner material layers during the implosion; this was not predicted by simulations. Furthermore, liner stagnation was delayed compared to simulation predictions. An analytical implosion model is compared with experimental data and preshot simulations to explore how changes in the premagnetization field strength and drive current affect the liner implosion trajectory. Both the measurement of >100 T internal axial field production and the demonstration of cylindrical uniformity of the imploding liner's inner wall are encouraging for promoting the use of AutoMag liners in future MagLIF experiments.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC04-94AL85000; NA0003525; NA0003864

OSTI ID:: 1515210

Alternate ID(s):: OSTI ID: 1513053

Report Number(s):: SAND--2019-4825J; 675121

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 26; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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