Axial plasma jet characterization on a microsecond x-pinch
Abstract
The jets produced on a microsecond x-pinch (quarter period T1/4 ~ 1 μs, dI/dt ~ 0.35 kA/ns) have been studied through light-field schlieren imaging and optical framing photographs across 4 different materials: Al, Ti, Mo, and W. The axial velocity of the jets was measured and exhibited no dependence on atomic number (Z) of the wire material. Additionally, there may be a dependence on another factor(s), namely, the current rise rate. The average axial jet velocity across all four materials was measured to be 2.9 ± 0.5 × 106 cm/s. The average jet diameter and the average radial jet expansion rate displayed inverse relationships with Z, which may be attributed to radiative cooling and inertia. Asymmetry between the anode and cathode jet behavior was observed and is thought to be caused by electron beam activity. The mean divergence angle of the jet was found to vary with wire material and correlated inversely with the thermal conductivity of the cold wire. Optical images indicated a two-layer structure in Al jets which may be caused by standing shocks and resemble phenomena observed in astrophysical jet formation and collimation. Finally, kinks in the jets have also been observed which may be caused bymore »
- Authors:
-
- Florida A&M Univ., Tallahassee, FL (United States)
- Publication Date:
- Research Org.:
- Florida A&M Univ., Tallahassee, FL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1511160
- Alternate Identifier(s):
- OSTI ID: 1440276
- Grant/Contract Number:
- FG02-03ER54725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 21; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE
Citation Formats
Jaar, G. S., and Appartaim, R. K. Axial plasma jet characterization on a microsecond x-pinch. United States: N. p., 2018.
Web. doi:10.1063/1.5026376.
Jaar, G. S., & Appartaim, R. K. Axial plasma jet characterization on a microsecond x-pinch. United States. https://doi.org/10.1063/1.5026376
Jaar, G. S., and Appartaim, R. K. Mon .
"Axial plasma jet characterization on a microsecond x-pinch". United States. https://doi.org/10.1063/1.5026376. https://www.osti.gov/servlets/purl/1511160.
@article{osti_1511160,
title = {Axial plasma jet characterization on a microsecond x-pinch},
author = {Jaar, G. S. and Appartaim, R. K.},
abstractNote = {The jets produced on a microsecond x-pinch (quarter period T1/4 ~ 1 μs, dI/dt ~ 0.35 kA/ns) have been studied through light-field schlieren imaging and optical framing photographs across 4 different materials: Al, Ti, Mo, and W. The axial velocity of the jets was measured and exhibited no dependence on atomic number (Z) of the wire material. Additionally, there may be a dependence on another factor(s), namely, the current rise rate. The average axial jet velocity across all four materials was measured to be 2.9 ± 0.5 × 106 cm/s. The average jet diameter and the average radial jet expansion rate displayed inverse relationships with Z, which may be attributed to radiative cooling and inertia. Asymmetry between the anode and cathode jet behavior was observed and is thought to be caused by electron beam activity. The mean divergence angle of the jet was found to vary with wire material and correlated inversely with the thermal conductivity of the cold wire. Optical images indicated a two-layer structure in Al jets which may be caused by standing shocks and resemble phenomena observed in astrophysical jet formation and collimation. Finally, kinks in the jets have also been observed which may be caused by m = 1 MHD instability modes or by the interaction of the jet with the electrode plasma.},
doi = {10.1063/1.5026376},
journal = {Journal of Applied Physics},
number = 21,
volume = 123,
place = {United States},
year = {Mon Jun 04 00:00:00 EDT 2018},
month = {Mon Jun 04 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Figures / Tables found in this record: