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 - 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 -