Time-resolved temperature in an argon theta-pinch by line ratio methods

Warner C. Meeks, Joshua L. Rovey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Pulsed inductive argon plasma in an 80 J, 15 kV, 490 kHz theta-pinch is interrogated using spectroscopic methods. Time-resolved electron temperature is obtained with line intensity ratios coupled with corona and collisional-radiative models. Neutral excited state argon transitions from the 2p to 1s sub-shells were utilized. Backfill pressures of 50 and 100 mTorr are of primary focus here. Time-resolved electron temperature estimates range from 2.4 to 8.6 eV for the steady-state corona model analysis while the collisional-radiative analysis predicts temperature in excess of 80 eV. Electron temperature can be seen to ramp up between approximately the first and third zero-crossings of the oscillating discharge current. Analysis of long exposures reveal substantial second order diffracted spectra. Low spectral signal quality for short exposures of 0.25 μs yield poor time-resolved spectra and ultimately elucidate the fundamental time-resolution limitation of this experimental test article.

Original languageEnglish (US)
Title of host publicationICOPS/BEAMS 2014 - 41st IEEE International Conference on Plasma Science and the 20th International Conference on High-Power Particle Beams
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479927111
DOIs
StatePublished - Jan 16 2015
Externally publishedYes
Event41st IEEE International Conference on Plasma Science, ICOPS 2014 and the 20th IEEE International Conference on High-Power Particle Beams, BEAMS 2014 - Washington, United States
Duration: May 25 2014May 29 2014

Publication series

NameICOPS/BEAMS 2014 - 41st IEEE International Conference on Plasma Science and the 20th International Conference on High-Power Particle Beams

Other

Other41st IEEE International Conference on Plasma Science, ICOPS 2014 and the 20th IEEE International Conference on High-Power Particle Beams, BEAMS 2014
CountryUnited States
CityWashington
Period5/25/145/29/14

Keywords

  • Hall-effect thruster
  • collisional-radiative model
  • corona model
  • intensity ratios
  • low energy
  • spectroscopy
  • theta-pinch
  • xenon

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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