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Title: Numerical and experimental studies of magnetic Rayleigh-Taylor instabilities in solid liners

Abstract

The authors have studied the nonlinear evolution of Magnetic Rayleigh-Taylor (MRT) instability in solid aluminum liners. Two-dimensional MHD modeling of the configuration have been performed using the measured current pulseform of the PEGASUS II capacitor bank as a magnetic field source. The liner configuration consisted of a solid aluminum annulus 20 mm long and 0.4 mm thick. The outer surface of the liner was machined with a sinusoidal ripple. Half of the liner was scribed with one wavelength, the other half with another wavelength. A series of experiments was conducted with a smooth surface and ripple wavelengths of 0.5, 0.75, and 2.0 mm. The peak-to-peak ripple amplitude was varied between 0.025 and 0.10 mm, but the ratio of the initial amplitude to wavelength never exceeded 7%. Diagnostics consisted of radiography, a center-conductor B-dot probe, and transmission line pulsed power diagnostics. The inner surfaces of the liners were coated with a thin film of gold (Au) to permit measurement of material deformation at various stages of the instability growth. Three radiographs, at different times, were taken for each experiment. The center-conductor magnetic probe was used to measure the magnetic field penetration through the liner. Initial comparisons between the data and themore » MHD calculations showed excellent agreement with respect to nonlinear instability growth and with the time of field rupture of the liner.« less

Authors:
; ; ;  [1]
  1. Los Alamos National Lab., NM (United States)
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
330583
Report Number(s):
CONF-970559-
Journal ID: ISSN 0730-9244; TRN: 99:004671
Resource Type:
Conference
Resource Relation:
Conference: 24. IEEE international conference on plasma science, San Diego, CA (United States), 19-23 May 1997; Other Information: PBD: 1997; Related Information: Is Part Of IEEE conference record -- Abstracts; PB: 354 p.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; RAYLEIGH-TAYLOR INSTABILITY; LINERS; PLASMA SIMULATION; ALUMINIUM; PLASMA DIAGNOSTICS; INSTABILITY GROWTH RATES; COMPARATIVE EVALUATIONS; MAGNETIC FIELDS

Citation Formats

Faehl, R J, Atchison, W L, Reinovsky, R E, and Morgan, D V. Numerical and experimental studies of magnetic Rayleigh-Taylor instabilities in solid liners. United States: N. p., 1997. Web.
Faehl, R J, Atchison, W L, Reinovsky, R E, & Morgan, D V. Numerical and experimental studies of magnetic Rayleigh-Taylor instabilities in solid liners. United States.
Faehl, R J, Atchison, W L, Reinovsky, R E, and Morgan, D V. 1997. "Numerical and experimental studies of magnetic Rayleigh-Taylor instabilities in solid liners". United States.
@article{osti_330583,
title = {Numerical and experimental studies of magnetic Rayleigh-Taylor instabilities in solid liners},
author = {Faehl, R J and Atchison, W L and Reinovsky, R E and Morgan, D V},
abstractNote = {The authors have studied the nonlinear evolution of Magnetic Rayleigh-Taylor (MRT) instability in solid aluminum liners. Two-dimensional MHD modeling of the configuration have been performed using the measured current pulseform of the PEGASUS II capacitor bank as a magnetic field source. The liner configuration consisted of a solid aluminum annulus 20 mm long and 0.4 mm thick. The outer surface of the liner was machined with a sinusoidal ripple. Half of the liner was scribed with one wavelength, the other half with another wavelength. A series of experiments was conducted with a smooth surface and ripple wavelengths of 0.5, 0.75, and 2.0 mm. The peak-to-peak ripple amplitude was varied between 0.025 and 0.10 mm, but the ratio of the initial amplitude to wavelength never exceeded 7%. Diagnostics consisted of radiography, a center-conductor B-dot probe, and transmission line pulsed power diagnostics. The inner surfaces of the liners were coated with a thin film of gold (Au) to permit measurement of material deformation at various stages of the instability growth. Three radiographs, at different times, were taken for each experiment. The center-conductor magnetic probe was used to measure the magnetic field penetration through the liner. Initial comparisons between the data and the MHD calculations showed excellent agreement with respect to nonlinear instability growth and with the time of field rupture of the liner.},
doi = {},
url = {https://www.osti.gov/biblio/330583}, journal = {},
issn = {0730-9244},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 31 00:00:00 EST 1997},
month = {Wed Dec 31 00:00:00 EST 1997}
}

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