Current polarity effects on laboratory plasma jets

Banasek, J. T.; Rocco, S. R.; Potter, W. M.; Lavine, E. S.; Seyler, C. E.; Kusse, B. R.; Hammer, D. A.

doi:10.1063/5.0048400

Current polarity effects on laboratory plasma jets

Journal Article · Mon Aug 02 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0048400· OSTI ID:1812489

^[1]; ^[2]; Potter, W. M. ^[2]; ^[2]; ^[2]; Kusse, B. R. ^[2]; ^[2]

Cornell Univ., Ithaca, NY (United States); Cornell Univesity
Cornell Univ., Ithaca, NY (United States)

Plasma jets produced by a pulsed power machine were investigated using Thomson scattering and other diagnostics in order to make detailed comparisons to simulations. These jets were produced from a 15 μm thick disc of Al foil on a 1.2 MA, 100 ns rise time, pulsed power machine. Experiments were performed with both a radially inward and a radially outward current ow in the Al foil to investigate the effects of voltage polarity in the experiments and determine how extended magnetohydrodynamic (XMHD) effects, such as the Hall effect, change the formation of the jet. We recorded Thomson scattering spectra with a low enough laser energy to not perturb the plasma, while providing a high enough signal to noise ratio to resolve the scattered features. This enabled the measurement of the electron temperature in the jet region of the plasma, 15.5±4 eV for both current polarities. Jets with a radially outward current ow were heated more from inverse bremsstrahlung when 10 J of laser energy was used, implying that these jets are denser than the ones with a radially inward current. This higher density was con rmed by interferometry measurements. Experimental results were compared with XMHD computer simulations, which predicted electron temperatures 1.5 to 3 σ above those measured, and significantly higher density than experiments in both polarities. In this paper, possible sources of this discrepancy are discussed.

View Accepted Manuscript (DOE)

Research Organization:: Cornell University, Ithaca, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: NA0003764

OSTI ID:: 1812489

Alternate ID(s):: OSTI ID: 1850360

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 28; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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