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Title: A prototype of an electric-discharge gas flow oxygen−iodine laser: I. Modeling of the processes of singlet oxygen generation in a transverse cryogenic slab RF discharge

Abstract

The existing kinetic model describing self-sustained and electroionization discharges in mixtures enriched with singlet oxygen has been modified to calculate the characteristics of a flow RF discharge in molecular oxygen and its mixtures with helium. The simulations were performed in the gas plug-flow approximation, i.e., the evolution of the plasma components during their motion along the channel was represented as their evolution in time. The calculations were carried out for the O{sub 2}: He = 1: 0, 1: 1, 1: 2, and 1: 3 mixtures at an oxygen partial pressure of 7.5 Torr. It is shown that, under these conditions, volumetric gas heating in a discharge in pure molecular oxygen prevails over gas cooling via heat conduction even at an electrode temperature as low as ~100 K. When molecular oxygen is diluted with helium, the behavior of the gas temperature changes substantially: heat removal begins to prevail over volumetric gas heating, and the gas temperature at the outlet of the discharge zone drops to ~220–230 K at room gas temperature at the inlet, which is very important in the context of achieving the generation threshold in an electric-discharge oxygen−iodine laser based on a slab cryogenic RF discharge.

Authors:
; ; ; ; ;  [1]
  1. Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22614014
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 43; Journal Issue: 3; Other Information: Copyright (c) 2017 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; CRYOGENICS; ELECTRIC DISCHARGES; ELECTRODES; GAS COOLING; GAS FLOW; HEATING; HELIUM; IODINE LASERS; KINETICS; OXYGEN; PARTIAL PRESSURE; PLASMA; RF SYSTEMS; SLABS; THERMAL CONDUCTION

Citation Formats

Vagin, N. P., Ionin, A. A., E-mail: aion@sci.lebedev.ru, Kochetov, I. V., Napartovich, A. P., Sinitsyn, D. V., E-mail: dsinit@sci.lebedev.ru, and Yuryshev, N. N. A prototype of an electric-discharge gas flow oxygen−iodine laser: I. Modeling of the processes of singlet oxygen generation in a transverse cryogenic slab RF discharge. United States: N. p., 2017. Web. doi:10.1134/S1063780X17030151.
Vagin, N. P., Ionin, A. A., E-mail: aion@sci.lebedev.ru, Kochetov, I. V., Napartovich, A. P., Sinitsyn, D. V., E-mail: dsinit@sci.lebedev.ru, & Yuryshev, N. N. A prototype of an electric-discharge gas flow oxygen−iodine laser: I. Modeling of the processes of singlet oxygen generation in a transverse cryogenic slab RF discharge. United States. doi:10.1134/S1063780X17030151.
Vagin, N. P., Ionin, A. A., E-mail: aion@sci.lebedev.ru, Kochetov, I. V., Napartovich, A. P., Sinitsyn, D. V., E-mail: dsinit@sci.lebedev.ru, and Yuryshev, N. N. Wed . "A prototype of an electric-discharge gas flow oxygen−iodine laser: I. Modeling of the processes of singlet oxygen generation in a transverse cryogenic slab RF discharge". United States. doi:10.1134/S1063780X17030151.
@article{osti_22614014,
title = {A prototype of an electric-discharge gas flow oxygen−iodine laser: I. Modeling of the processes of singlet oxygen generation in a transverse cryogenic slab RF discharge},
author = {Vagin, N. P. and Ionin, A. A., E-mail: aion@sci.lebedev.ru and Kochetov, I. V. and Napartovich, A. P. and Sinitsyn, D. V., E-mail: dsinit@sci.lebedev.ru and Yuryshev, N. N.},
abstractNote = {The existing kinetic model describing self-sustained and electroionization discharges in mixtures enriched with singlet oxygen has been modified to calculate the characteristics of a flow RF discharge in molecular oxygen and its mixtures with helium. The simulations were performed in the gas plug-flow approximation, i.e., the evolution of the plasma components during their motion along the channel was represented as their evolution in time. The calculations were carried out for the O{sub 2}: He = 1: 0, 1: 1, 1: 2, and 1: 3 mixtures at an oxygen partial pressure of 7.5 Torr. It is shown that, under these conditions, volumetric gas heating in a discharge in pure molecular oxygen prevails over gas cooling via heat conduction even at an electrode temperature as low as ~100 K. When molecular oxygen is diluted with helium, the behavior of the gas temperature changes substantially: heat removal begins to prevail over volumetric gas heating, and the gas temperature at the outlet of the discharge zone drops to ~220–230 K at room gas temperature at the inlet, which is very important in the context of achieving the generation threshold in an electric-discharge oxygen−iodine laser based on a slab cryogenic RF discharge.},
doi = {10.1134/S1063780X17030151},
journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 3,
volume = 43,
place = {United States},
year = {2017},
month = {3}
}