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

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 μm 2 ra d -2) k 2 in ~ 1 g/cm 3, ~ 7000 K aluminum.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [2] ;  [2] ;  [1]
  1. Univ. of Nevada, Reno, NV (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. University of New Mexico
Publication Date:
Report Number(s):
SAND-2017-7784J
Journal ID: ISSN 2470-0045; PLEEE8; 655591
Grant/Contract Number:
AC04-94AL85000; NA0003525; 178661; 200269
Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1464184
Alternate Identifier(s):
OSTI ID: 1437503

Hutchinson, Trevor M., Awe, Thomas James, Bauer, Bruno, Yates, Kevin, Yu, Edmund P., Yelton, William G., and Fuelling, Stephan. Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth. United States: N. p., Web. doi:10.1103/PhysRevE.97.053208.
Hutchinson, Trevor M., Awe, Thomas James, Bauer, Bruno, Yates, Kevin, Yu, Edmund P., Yelton, William G., & Fuelling, Stephan. Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth. United States. doi:10.1103/PhysRevE.97.053208.
Hutchinson, Trevor M., Awe, Thomas James, Bauer, Bruno, Yates, Kevin, Yu, Edmund P., Yelton, William G., and Fuelling, Stephan. 2018. "Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth". United States. doi:10.1103/PhysRevE.97.053208.
@article{osti_1464184,
title = {Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth},
author = {Hutchinson, Trevor M. and Awe, Thomas James and Bauer, Bruno and Yates, Kevin and Yu, Edmund P. and Yelton, William G. and Fuelling, Stephan},
abstractNote = {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.},
doi = {10.1103/PhysRevE.97.053208},
journal = {Physical Review E},
number = 5,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}