This work is devoted to the characterization of plasmas produced by an intense pulsed relativistic electron beam propagating in air at atmospheric pressure. A large range of a time integrated dose is investigated [0.75 to 7.4] kGy(air) inducing electron densities from 2 × 1012 up to 1.6 × 1014 cm−3. The air plasmas are analyzed by two complementary diagnostics: microwave absorption and optical emission spectroscopy, to deduce plasma parameters during the creation and relaxation phases, respectively. A reduced air kinetics model is used to calculate transmission measurements during the electron beam pulse and to infer electric conductivities, which are compared to the results of three-dimensional Maxwell calculations. Optical emission spectra are measured and compared to calculated ones, giving rotational and vibrational temperatures during the relaxation phase of the plasma. These plasma characterizations may be used to model non-equilibrium atmospheric air plasma chemistry in the framework of, for instance, streamer dynamics as well as corona or dielectric barrier discharges.
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7 September 2020
Research Article|
September 03 2020
Microwave absorption and optical emission spectrometry analyses of ambient air plasmas induced by pulsed electron beams
M. Ribière
;
M. Ribière
a)
1
CEA, DAM, GRAMAT
, F-46500 Gramat, France
a)Author to whom correspondence should be addressed: [email protected]
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O. Eichwald;
O. Eichwald
2
LAPLACE, UMR 5213 CNRS, University Paul Sabatier of Toulouse
, 118 Route de Narbonne, Toulouse, France
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M. Yousfi
M. Yousfi
2
LAPLACE, UMR 5213 CNRS, University Paul Sabatier of Toulouse
, 118 Route de Narbonne, Toulouse, France
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a)Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 128, 093304 (2020)
Article history
Received:
May 28 2020
Accepted:
August 04 2020
Citation
M. Ribière, O. Eichwald, M. Yousfi; Microwave absorption and optical emission spectrometry analyses of ambient air plasmas induced by pulsed electron beams. J. Appl. Phys. 7 September 2020; 128 (9): 093304. https://doi.org/10.1063/5.0015482
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