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Title: Radial magnetic compression in the expelled jet of a plasma deflagration accelerator

Abstract

Here, a spectroscopic study of a pulsed plasma deflagration accelerator is carried out that confirms the existence of a strong compression in the emerging jet at the exit plane of the device. An imaging spectrometer is used to collect broadened Hα emission from a transaxial slice of the emerging jet at high spatial resolution, and the radial plasma density profile is computed from Voigt fits of the Abel inverted emissivity profiles. The plasma temperature, determined via Doppler broadening of impurity line emission, is compared against the temperature predictions of a radial magnetohydrodynamic equilibrium model applied to the measured density profiles. Empirical scaling laws developed for the plasma density, combined with the measured and predicted temperatures, indicate that a radially equilibrated Z-pinch is formed within the expelled plasma jet at the exit plane during the deflagration process.

Authors:
 [1]; ORCiD logo [1];  [1];  [1]
  1. Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
Stanford Univ., CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1470320
Alternate Identifier(s):
OSTI ID: 1240202
Grant/Contract Number:  
NA0002011
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 9; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Loebner, Keith T. K., Underwood, Thomas C., Mouratidis, Theodore, and Cappelli, Mark. A. Radial magnetic compression in the expelled jet of a plasma deflagration accelerator. United States: N. p., 2016. Web. doi:10.1063/1.4943370.
Loebner, Keith T. K., Underwood, Thomas C., Mouratidis, Theodore, & Cappelli, Mark. A. Radial magnetic compression in the expelled jet of a plasma deflagration accelerator. United States. doi:10.1063/1.4943370.
Loebner, Keith T. K., Underwood, Thomas C., Mouratidis, Theodore, and Cappelli, Mark. A. Mon . "Radial magnetic compression in the expelled jet of a plasma deflagration accelerator". United States. doi:10.1063/1.4943370. https://www.osti.gov/servlets/purl/1470320.
@article{osti_1470320,
title = {Radial magnetic compression in the expelled jet of a plasma deflagration accelerator},
author = {Loebner, Keith T. K. and Underwood, Thomas C. and Mouratidis, Theodore and Cappelli, Mark. A.},
abstractNote = {Here, a spectroscopic study of a pulsed plasma deflagration accelerator is carried out that confirms the existence of a strong compression in the emerging jet at the exit plane of the device. An imaging spectrometer is used to collect broadened Hα emission from a transaxial slice of the emerging jet at high spatial resolution, and the radial plasma density profile is computed from Voigt fits of the Abel inverted emissivity profiles. The plasma temperature, determined via Doppler broadening of impurity line emission, is compared against the temperature predictions of a radial magnetohydrodynamic equilibrium model applied to the measured density profiles. Empirical scaling laws developed for the plasma density, combined with the measured and predicted temperatures, indicate that a radially equilibrated Z-pinch is formed within the expelled plasma jet at the exit plane during the deflagration process.},
doi = {10.1063/1.4943370},
journal = {Applied Physics Letters},
number = 9,
volume = 108,
place = {United States},
year = {2016},
month = {2}
}

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