TY - GEN
T1 - Radar REMPI diagnostic for low neutral density measurements of xenon in helium buffer gas
T2 - 49th AIAA Plasmadynamics and Lasers Conference, 2018
AU - Galea, Christopher A.
AU - Shneider, Mikhail N.
AU - Chng, Tat Loon
AU - Dogariu, Arthur
AU - Miles, Richard B.
N1 - Funding Information:
This research was conducted with government support from the Air Force Office of Scientific Research (AFOSR) through an SBIR with MetroLaser, Inc. and the Office of Naval Research (ONR).
Publisher Copyright:
© 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2018
Y1 - 2018
N2 - In order to accurately use Radar REMPI as a diagnostic technique, care must be taken to consider how to extrapolate the electron and neutral atom number densities from a given signal. We investigate the dependence of the Radar REMPI signal on the electron collision frequency, specifically in xenon-helium (Xe:He) mixtures, where helium is the buffer gas and the concentration of xenon is 10 ppm or less. We develop a 0-dimensional kinetic model with REMPI ionization to determine the effects of the collision frequency on the signal amplitude and determine a quantitative map between the signal obtained and the neutral xenon density. Good agreement is shown for 1 ppm xenon in atmospheric pressure (∼760 Torr) helium, indicating the importance of modeling the plasma parameters to more accurately assess the signal. An upper bound for the cross-section of two-photon excitation from the ground 5p6 1S0 state to the 5p56p[5/2]2 state of xenon by circularly-polarized light is computed.
AB - In order to accurately use Radar REMPI as a diagnostic technique, care must be taken to consider how to extrapolate the electron and neutral atom number densities from a given signal. We investigate the dependence of the Radar REMPI signal on the electron collision frequency, specifically in xenon-helium (Xe:He) mixtures, where helium is the buffer gas and the concentration of xenon is 10 ppm or less. We develop a 0-dimensional kinetic model with REMPI ionization to determine the effects of the collision frequency on the signal amplitude and determine a quantitative map between the signal obtained and the neutral xenon density. Good agreement is shown for 1 ppm xenon in atmospheric pressure (∼760 Torr) helium, indicating the importance of modeling the plasma parameters to more accurately assess the signal. An upper bound for the cross-section of two-photon excitation from the ground 5p6 1S0 state to the 5p56p[5/2]2 state of xenon by circularly-polarized light is computed.
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U2 - 10.2514/6.2018-3435
DO - 10.2514/6.2018-3435
M3 - Conference contribution
AN - SCOPUS:85051639062
SN - 9781624105494
T3 - 2018 Plasmadynamics and Lasers Conference
BT - 2018 Plasmadynamics and Lasers Conference
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
Y2 - 25 June 2018 through 29 June 2018
ER -