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Title: Microwave heating systems for atmospheric pressure: Nonequilibrium plasmas

Abstract

Nonequilibrium plasma-chemical processing is attracting increasing interest because of the possibility of creating mixtures of active species that would not be available in thermal equilibrium. For significant throughput of reactants it would be advantageous to create nonequilibrium plasmas in large volumes of atmospheric-pressure mixtures of gases. Techniques for accomplishing this are very limited at present. Here they describe a novel microwave approach to creating nonequilibrium plasmas in large volumes of atmospheric-pressure gases using pulses of microwave radiation with very high peak power that are focused by quasi-optical techniques at one or more points in the interior of the reaction chamber. A new type of microwave source, the Plasma Electron Microwave Source (PEMS), is able to produce the require power levels by storing cw microwave power in a mirror-confined, relativistic-electron plasma and periodically transforming a fraction of that stored energy into intense microwave pulses. This approach avoids many of the limitations inherent in resonant cavity approaches and is expected to permit ultrahigh purity discharges to be produced.

Authors:
;  [1]
  1. (AMPC, Inc., Carlsbad, CA (USA))
Publication Date:
OSTI Identifier:
7155184
Resource Type:
Journal Article
Journal Name:
Plasma Chemistry and Plasma Processing; (USA)
Additional Journal Information:
Journal Volume: 9:1; Journal ID: ISSN 0272-4324
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 54 ENVIRONMENTAL SCIENCES; FLUE GAS; PURIFICATION; GASES; HIGH-FREQUENCY DISCHARGES; MAGNETIC MIRRORS; PERFORMANCE; NON-EQUILIBRIUM PLASMA; ADIABATIC COMPRESSION HEATING; AIR POLLUTION ABATEMENT; ATMOSPHERIC PRESSURE; CHEMICAL REACTORS; DENITRIFICATION; DESULFURIZATION; ELECTRON TEMPERATURE; ENERGY STORAGE; MAGNETIC MIRROR CONFIGURATIONS; MATHEMATICAL MODELS; MICROWAVE EQUIPMENT; MICROWAVE RADIATION; MIXTURES; NITROGEN OXIDES; PLASMA PRODUCTION; PLASMA SIMULATION; PLASMA WAVES; POLLUTION CONTROL EQUIPMENT; RELATIVISTIC RANGE; SULFUR DIOXIDE; VOLUME; CHALCOGENIDES; CHEMICAL REACTIONS; DISPERSIONS; ELECTRIC DISCHARGES; ELECTROMAGNETIC RADIATION; ELECTRONIC EQUIPMENT; ENERGY RANGE; EQUIPMENT; FLUIDS; GASEOUS WASTES; HEATING; MAGNETIC FIELD CONFIGURATIONS; NITROGEN COMPOUNDS; OPEN CONFIGURATIONS; OPEN PLASMA DEVICES; OXIDES; OXYGEN COMPOUNDS; PLASMA; PLASMA HEATING; POLLUTION ABATEMENT; RADIATIONS; SIMULATION; STORAGE; SULFUR COMPOUNDS; SULFUR OXIDES; THERMONUCLEAR DEVICES; WASTES; 400800* - Combustion, Pyrolysis, & High-Temperature Chemistry; 700101 - Fusion Energy- Plasma Research- Confinement, Heating, & Production; 700203 - Fusion Power Plant Technology- Power Supplies, Energy Storage; 540120 - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Guest, G.E., and Dandl, R.A. Microwave heating systems for atmospheric pressure: Nonequilibrium plasmas. United States: N. p., 1989. Web. doi:10.1007/BF01015873.
Guest, G.E., & Dandl, R.A. Microwave heating systems for atmospheric pressure: Nonequilibrium plasmas. United States. doi:10.1007/BF01015873.
Guest, G.E., and Dandl, R.A. Wed . "Microwave heating systems for atmospheric pressure: Nonequilibrium plasmas". United States. doi:10.1007/BF01015873.
@article{osti_7155184,
title = {Microwave heating systems for atmospheric pressure: Nonequilibrium plasmas},
author = {Guest, G.E. and Dandl, R.A.},
abstractNote = {Nonequilibrium plasma-chemical processing is attracting increasing interest because of the possibility of creating mixtures of active species that would not be available in thermal equilibrium. For significant throughput of reactants it would be advantageous to create nonequilibrium plasmas in large volumes of atmospheric-pressure mixtures of gases. Techniques for accomplishing this are very limited at present. Here they describe a novel microwave approach to creating nonequilibrium plasmas in large volumes of atmospheric-pressure gases using pulses of microwave radiation with very high peak power that are focused by quasi-optical techniques at one or more points in the interior of the reaction chamber. A new type of microwave source, the Plasma Electron Microwave Source (PEMS), is able to produce the require power levels by storing cw microwave power in a mirror-confined, relativistic-electron plasma and periodically transforming a fraction of that stored energy into intense microwave pulses. This approach avoids many of the limitations inherent in resonant cavity approaches and is expected to permit ultrahigh purity discharges to be produced.},
doi = {10.1007/BF01015873},
journal = {Plasma Chemistry and Plasma Processing; (USA)},
issn = {0272-4324},
number = ,
volume = 9:1,
place = {United States},
year = {1989},
month = {3}
}