Optical Emission Spectroscopy of Plasma Formation in a Xenon Theta Pinch
Analyses of xenon spectral emission data in the IR range primarily from Xe I transitions and estimations of electron temperature are performed on a theta pinch test article. Estimations are based on a collisional-radiative model originally written for Hall-effect thrusters by Karabadzhak et al. which takes into account metastable species in the 1s excited state of xenon. Tests performed on a pulsed xenon plasma at an energy of 80 joules, neutral back-fill pressures of 10ˉ² to 10ˉ¹ Torr, and discharge frequency of 460 kHz yield electron temperatures of 6.5 to 11.3 eV for cumulative spectra in the first 20 µs. Spectra acquired in the UV range verify the presence of 2nd order diffraction from Xe II transitions. Low single-to-noise ratios for optical gate widths of 250 nanoseconds produce substantial fluctuation in intensities and thus estimation errors, while not quantified here, are assumed high.
W. C. Meeks et al., "Optical Emission Spectroscopy of Plasma Formation in a Xenon Theta Pinch," 19th IEEE Pulsed Power Conference, Institute of Electrical and Electronics Engineers (IEEE), Jan 2013.
The definitive version is available at http://dx.doi.org/10.1109/PPC.2013.6627444
19th IEEE Pulsed Power Conference
Mechanical and Aerospace Engineering
Keywords and Phrases
Discharges (Electric); Metastable States; Pinch Effect; Plasma Collision Processes; Plasma Diagnostics; Plasma Temperature; Xenon
Article - Conference proceedings
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