R. Vandervort

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Laser Induced Fluorescence (LIF) provides measurements of flow speed, temperature, and density of ions or neutrals in a plasma. Traditionally, a LIF measurement requires two ports on a plasma device; one for laser injection and one for emission collection. Proper alignment of LIF optics is time consuming and sensitive to mechanical vibration. We describe a(More)
J. Carr, Jr., P. A. Cassak, M. Galante, A. M. Keesee, G. Lusk, R. M. Magee, D. McCarren, E. E. Scime, S. Sears, R. Vandervort, N. Gulbrandsen, Martin Goldman, David Newman, and J. P. Eastwood Department of Physics, West Virginia University, Morgantown, West Virginia 26506, USA University of Tromsø, Tromsø, Norway Department of Physics, University of(More)
Damping of Alfvén waves is one of the most likely mechanisms for ion heating in the solar corona. Ion-neutral collisions have significant but poorly-understood effects on energy transfer and Alfvén wave propagation in partially ionized plasmas, such as those found in the solar chromosphere. Alfvén waves are thought to play a major(More)
Summary form only given. In this work we compare measurements of argon ion velocity distribution functions (IVDFs) in a helicon plasma using two spectroscopic techniques: laser induced florescence (LIF) and continuous wave cavity ring down spectroscopy (CW-CRDS). LIF is an established and powerful technique, but suffers from the requirement that the initial(More)
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