Direct current glow discharges in atmospheric air

Stark, R.H.; Schoenbach, K.H.

doi:10.1063/1.124174

Cited by 157 publications

(109 citation statements)

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“…However, it is possible to enlarge the plasma volume either by arranging such micro-discharges in arrays, by extending it when used as a plasma cathode with a third electrode positively biased and located some distance away [12] or by using both techniques [13]. One method used to ignite arrays of microdischarges is to limit the current driven by each microdischarge through the use of either individual [14] or distributed [15] ballast resistors.…”

Section: Introductionmentioning

confidence: 99%

Breakdown study of dc silicon micro-discharge devices

Schwaederlé

Kulsreshath

Overzet

et al. 2012

J. Phys. D: Appl. Phys.

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Abstract. The influence of geometrical and operating parameters on the electrical characteristics of dc micro-cavity discharges provides insight into their controlling physics. We present here results of such a study on silicon based micro-cavity discharge devices carried out in helium at pressure ranging from 100 to 1000 Torr. Different micro-reactor configurations were measured. The differences include: isolated single cavities versus arrays of closely spaced cavities, various cavity geometries (un-etched as well as isotropically and anisotropically etched), various dimensions (100 or 150 µm cavity diameter and 0 to 150 µm depth). The electrode gap was kept constant in all cases at approximately 6 µm. The applied electric field reaches 5·10 7 V·m −1 which results in current and power densities up to 2 A·cm −2 and 200 kW·cm −3 respectively. The number of micro-cavities and the micro-cavity depth are shown to be the most important geometrical parameters for predicting breakdown and operation of microcavity devices. The probability of initiatory electron generation which is volume dependent and the electric field strength which is depth dependent are respectively considered to be responsible. The cavity shape (isotropic/anisotropic) and diameter had no significant influence. The number of micro-discharges that could be ignited depends on the rate of voltage rise and pressure. Larger numbers ignite at lower frequency and pressure. In addition, the voltage polarity has the largest influence on the electrical characteristics of the micro-discharge of all parameters, which is due to both the asymmetric role of electrodes as electron emitter and the non-uniformity of the electric field resulting in different ionization efficiencies. The qualitative shape of all breakdown voltage versus pressure curves can be explained in terms of the distance over which the discharge breakdown effectively occurs as long as one understand that this distance can depend on pressure.

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Section: Introductionmentioning

confidence: 99%

Breakdown study of dc silicon micro-discharge devices

Schwaederlé

Kulsreshath

Overzet

et al. 2012

J. Phys. D: Appl. Phys.

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“…Slow electron recombination could therefore explain the differences at low current densities. Figure 45 also shows experimental data obtained by Stark and Schoenbach [62] in an atmospheric pressure glow discharge in air. The discharge was produced between a microhollow cathode and a positively biased electrode, as described in Ref.…”

Section: 5 Electrical Characteristics and Power Requirements Of DCmentioning

confidence: 98%

Mechanisms of Ionizational Nonequilibrium in Air Plasmas

Kruger¹

2002

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching e: the collection of information. Send comments regardinathis burden estimate or any other aspect of this collection of information, including suggestions Operations and Reports, 1215 Jefferson t&vis töghw*y, Uiite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork R

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“…The microhollow cathode stabilized glow discharge studied in K. Schoenbach's group [1] has been proposed as a source for the diagnostics, but this field has been open to other solutions. It has been scheduled to perform experimental characterization of the plasma by electric and spectroscopic means, as well as modeling if enough time can be found.…”

Section: (A) Design and Characterization Of A Plasma Sourcementioning

confidence: 99%

“…If the errors on AT, 1 and Ap 2 are both equal to 6p, the uncertainty on the measured value of J. can be expressde like:…”

Section: Nymentioning

confidence: 99%

Basic Studies on High Pressure Air Plasmas

Schoenbach¹

2006

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information This project focuses on the development of diagnostic methods for electron density and gas temperature measurements of microdischarges in atmospheric pressure air, two of the most important plasma parameters for any plasma application. Two types of diagnostic techniques have being explored: emission spectroscopy for temperature measurements and two wavelength laser heterodyne interferometry for electron density. They were applied to glow discharges in atmospheric pressure air with dimensions in the millimeter range and less. Temperature measurements on this type of discharge have confirmed earlier studies where the temperature was found to be on the order of 2,000 K. A dual-wavelength heterodyne laser interferometer has been built and tested, however the results indicated, that the stability of the lasers is not sufficient for recording of the phase changes caused by these micro discharges. Suggestions for improvement of the diagnostic device are given. SUBJECT TERMS SECURITY 20061016145 SummaryThe growing interest in atmospheric pressure glow discharges in air is due to a host of applications ranging from EM absorbers and reflectors to chemical and biological decontamination. The utilization of these nonthermal plasmas requires the development of plasma diagnostic techniques with appropriate spatial and temporal resolution. Parameters of interest are electron density and gas temperature. Typical values for these discharges are electron densities of up to 1013 cm 3 , and temperatures of less than 2000 K [1,2]. The goal of this project was to develop diagnostic methods, which would allow us to measure the gas temperature at an electron density of 1013 cm" 3 and below with high spatial resolution (on the order of 100 pum), parameters that are relevant for a wide range of presently used atmospheric pressure air plasmas [3].The diagnostic technique for the determination of the gas temperature is based on emission spectroscopy (rotational spectrum of the second positive system of nitrogen). An introduction to this method was presented in ref [4] by R. Block and 0. Toedter. Experiments performed on atmospheric pressure discharges have confirmed earlier measurements [2]. In order to determine the electron density in atmospheric pressure air plasmas, we have developed a diagnostic system that is based on phase shift measurement using two light sources of different wavelengths. The phase shift is determined by electrons and by heavy particles. By using two wavelengths it is possible to separate the contri...

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Direct current glow discharges in atmospheric air

Cited by 157 publications

References 6 publications

Breakdown study of dc silicon micro-discharge devices

Breakdown study of dc silicon micro-discharge devices

Mechanisms of Ionizational Nonequilibrium in Air Plasmas

Basic Studies on High Pressure Air Plasmas

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