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Abstract: EOIL Power Scaling in a 1-5 kW Supersonic Discharge-Flow Reactor
Steven J. Davis, Seonkyung Lee, David B. Oakes, Julie Haney, John C. Magill, Dwane A. Paulsen, Paul Cataldi, Krisin L. Galbally-Kinney, Danthu Vu, Jan Polex,
"EOIL Power Scaling in a 1-5 kW Supersonic Discharge-Flow Reactor
,"
presented at SPIE Photonics West LASE 2008
(San Jose, CA)
,
(19-24 January2008).
Copyright © 2008 Society of Photo-Optical Instrumentation Engineers.
This paper was published in SPIE Photonics West LASE 2008,
and is made available as an electronic reprint (preprint)
with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple
reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this
paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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 (a1࢞g, b1Sg+), 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), (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
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