Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth

Hutchinson, Trevor M.; Awe, Thomas James; Bauer, Bruno; Yates, Kevin; Yu, Edmund P.; Yelton, William G.; Fuelling, Stephan

doi:10.1103/PhysRevE.97.053208

Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth

Journal Article · Thu May 17 00:00:00 EDT 2018 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.97.053208· OSTI ID:1464184

Hutchinson, Trevor M. ^[1]; Awe, Thomas James ^[2]; Bauer, Bruno ^[1]; Yates, Kevin ^[3]; Yu, Edmund P. ^[2]; Yelton, William G. ^[2]; Fuelling, Stephan ^[1]

Univ. of Nevada, Reno, NV (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
University of New Mexico

A direct observation of the stratified electrothermal instability on the surface of thick metal is reported. Aluminum rods coated with 70 μm Parylene-N were driven to 1 MA in 100 ns, with the metal thicker than the skin depth. Here, the dielectric coating suppressed plasma formation, enabling persistent observation of discrete azimuthally correlated stratified thermal perturbations perpendicular to the current whose wave numbers, k, grew exponentially with rate γ (k) = 0.06 ns^-1 - (0.4 ns^-1 μm² ra d^-2) k² in ~ 1 g/cm³, ~ 7000 K aluminum.

View Accepted Manuscript (DOE)

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

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

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

OSTI ID:: 1464184

Alternate ID(s):: OSTI ID: 1437503

Report Number(s):: SAND--2017-7784J; 655591

Journal Information:: Physical Review E, Journal Name: Physical Review E Journal Issue: 5 Vol. 97; ISSN PLEEE8; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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