Chemistry and Physics Faculty Proceedings, Presentations, Speeches, Lectures


Measurements and spectral modeling of neutral argon as a diagnostic in the ALEXIS plasma

Event Name/Location

2011 American Physical Society Division of Plasma Physics meeting/

Event Name

53rd Annual Meeting of the American Physical Society Division of Plasma Physics

Event Location

Salt Lake City, Utah

Document Type


Publication Date


Date Range

November 14–18, 2011


We present spectral measurements and theoretical results for an argon plasma experiment on the ALEXIS (Auburn Linear~Experiment for Instability Studies) device. Langmuir probe measurements for the electron temperature and density profiles along the line of sight were taken for a wide range of plasma B-field settings. Comparisons with theoretical models show that the plasma is not in ionization equilibrium. A theoretical spectrum is constructed using the line of sight profiles and recently calculated R-matrix atomic data. We also investigate the role of a non-equilibrium population in the neutral Ar metastable and how that affects the spectrum.

*This work is supported by grants from the US Department of Energy.

Conference Proceeding Title

Bulletin of the American Physical Society