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Proceedings Paper

EOIL power scaling in a 1-5 kW supersonic discharge-flow reactor
Author(s): Steven J. Davis; Seonkyung Lee; David B. Oakes; Julie Haney; John C. Magill; Dwane A. Paulsen; Paul Cataldi; Kristin L. Galbally-Kinney; Danthu Vu; Jan Polex; William J. Kessler; Wilson T. Rawlins
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Paper Abstract

Scaling of EOIL systems to higher powers requires extension of electric discharge powers into the kW range and beyond with high efficiency and singlet oxygen yield. We have previously demonstrated a high-power microwave discharge approach capable of generating singlet oxygen yields of ~25% at ~50 torr pressure and 1 kW power. This paper describes the implementation of this method in a supersonic flow reactor designed for systematic investigations of the scaling of gain and lasing with power and flow conditions. The 2450 MHz microwave discharge, 1 to 5 kW, is confined near the flow axis by a swirl flow. The discharge effluent, containing active species including O2(a1Δg, b1Σg+), O(3P), and O3, passes through a 2-D flow duct equipped with a supersonic nozzle and cavity. I2 is injected upstream of the supersonic nozzle. The apparatus is water-cooled, and is modular to permit a variety of inlet, nozzle, and optical configurations. A comprehensive suite of optical emission and absorption diagnostics is used to monitor the absolute concentrations of O2(a), O2(b), O(3P), O3, I2, I(2P3/2), I(2P1/2), small-signal gain, and temperature in both the subsonic and supersonic flow streams. We discuss initial measurements of singlet oxygen and I* excitation kinetics at 1 kW power.

Paper Details

Date Published: 21 February 2008
PDF: 11 pages
Proc. SPIE 6874, High Energy/Average Power Lasers and Intense Beam Applications II, 68740D (21 February 2008); doi: 10.1117/12.773786
Show Author Affiliations
Steven J. Davis, Physical Sciences Inc. (United States)
Seonkyung Lee, Physical Sciences Inc. (United States)
David B. Oakes, Physical Sciences Inc. (United States)
Julie Haney, Physical Sciences Inc. (United States)
John C. Magill, Physical Sciences Inc. (United States)
Dwane A. Paulsen, Physical Sciences Inc. (United States)
Paul Cataldi, Physical Sciences Inc. (United States)
Kristin L. Galbally-Kinney, Physical Sciences Inc. (United States)
Danthu Vu, Physical Sciences Inc. (United States)
Jan Polex, Physical Sciences Inc. (United States)
William J. Kessler, Physical Sciences Inc. (United States)
Wilson T. Rawlins, Physical Sciences Inc. (United States)

Published in SPIE Proceedings Vol. 6874:
High Energy/Average Power Lasers and Intense Beam Applications II
Steven J. Davis; Michael C. Heaven; J. Thomas Schriempf, Editor(s)

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