Electric Charging in Dielectric Barrier Discharges with Asymmetric Gamma‐Coefficients

Stollenwerk, L.; Stroth, U.

doi:10.1002/ctpp.201000002

Cited by 14 publications

(10 citation statements)

References 10 publications

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“…It must be noted that some electro-optic crystals have distinct differences from the classical dielectric barrier materials. The dielectric constant is considerable higher, the secondary electron emission coefficient is assumed to be smaller than for glass [98,236], and photo-induced transport of charges on the minutes-scale has been obtained for bismuth silicon oxide crystals [98,215,237].…”

Section: Methods and Techniquesmentioning

confidence: 99%

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Brandenburg

2017

Plasma Sources Sci. Technol.

626

424

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Dielectric barrier discharges (DBDs) are plasmas generated in configurations with an insulating (dielectric) material between the electrodes which is responsible for a self-pulsing operation. DBDs are a typical example of nonthermal atmospheric or normal pressure gas discharges. Initially used for the generation of ozone, they have opened up many other fields of application. Therefore DBDs are a relevant tool in current plasma technology as well as an object for fundamental studies. Another motivation for further research is the fact that so-called partial discharges in insulated high voltage systems are special types of DBDs. The breakdown processes, the formation of structures, and the role of surface processes are currently under investigation. This review is intended to give an update to the already existing literature on DBDs considering the research and development within the last two decades. The main principles and different modes of discharge generation are summarized. A collection of known as well as special electrode configurations and reactor designs will be presented. This shall demonstrate the different and broad possibilities, but also the similarities and common aspects of devices for different fields of applications explored within the last years. The main part is devoted to the progress on the investigation of different aspects of breakdown and plasma formation with the focus on single filaments or microdischarges. This includes a summary of the current knowledge on the electrical characterization of filamentary DBDs. In particular, the recent new insights on the elementary volume and surface memory mechanisms in these discharges will be discussed. An outlook for the forthcoming challenges on research and development will be given.

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Section: Methods and Techniquesmentioning

confidence: 99%

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Brandenburg

2017

Plasma Sources Sci. Technol.

626

424

View full text Add to dashboard Cite

show abstract

“…The discrepancy to the negative charge amount (−1.7 nC) was already pointed out in previous investigations [27,29]. Most likely, it indicates a bias caused by different secondary electron emission coefficients of the dielectrics used [42]. During the breakdown phase, the wide deposition of surface electrons on the anodic dielectric is revealed, unlike the centered accumulation of positive surface charges on the cathodic dielectric resulting in a ring of residual surface electrons.…”

Section: Surface Charge Dynamicsmentioning

confidence: 70%

Self-stabilized discharge filament in plane-parallel barrier discharge configuration: formation, breakdown mechanism, and memory effects

Tschiersch

Nemschokmichal

Bogaczyk

et al. 2017

J. Phys. D: Appl. Phys.

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Single self-stabilized discharge filaments were investigated in the plane-parallel electrode configuration. The barrier discharge was operated inside a gap of 3 mm shielded by glass plates to both electrodes, using helium-nitrogen mixtures and a square-wave feeding voltage at a frequency of 2 kHz. The combined application of electrical measurements, ICCD camera imaging, optical emission spectroscopy and surface charge diagnostics via the electro-optic Pockels effect allowed the correlation of the discharge development in the volume and on the dielectric surfaces. The formation criteria and existence regimes were found by systematic variation of the nitrogen admixture to helium, the total pressure and the feeding voltage amplitude. Single self-stabilized discharge filaments can be operated over a wide parameter range, foremost, by significant reduction of the voltage amplitude after the operation in the microdischarge regime. Here, the outstanding importance of the surface charge memory effect on the long-term stability was pointed out by the recalculated spatio-temporally resolved gap voltage. The optical emission revealed discharge characteristics that are partially reminiscent of both the glow-like barrier discharge and the microdischarge regime, such as a Townsend pre-phase, a fast cathode-directed ionization front during the breakdown and radially propagating surface discharges during the afterglow.

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“…This effect could be controlled by modulating the pulse parameters (to be explained in Figure ). Since, DBD plasma devices are commonly used in biomedical applications, the simulation with the low secondary electron emission coefficient

γ = 0.01

is also conducted for the pulsed microwave case. It is found that the pulsed microwave DBD plasma sustained by the same driving voltage (

V_{on} = 150

V) produces as much energetic electrons as in the bare electrode case.…”

Section: Resultsmentioning

confidence: 99%

Generation of energetic electrons in pulsed microwave plasmas

Lee

Yun

2017

Plasma Processes & Polymers

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Pulsed microwave driven microplasma at atmospheric pressure is proposed as an efficient source of energetic electrons for low-temperature biomedical applications. Energetic electrons are required to break the covalent bonds of nitrogen, oxygen, and water molecules in humid air and produce reactive species. Particle-in-cell (PIC) simulations demonstrate that the energetic electrons with energy greater than 10 eV (capable of breaking the bond of nitrogen molecules) can be produced much more efficiently in pulsed microwave helium plasmas than in pulsed DC or continuous microwave plasmas.In particular, fast heating and cooling of electrons are observed at the rising edge and the falling edge of the pulse, respectively. This phenomenon is consistent with the fluid analysis showing the electrons' energy gain via collective motion and collisional loss to the neutral particles.

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Electric Charging in Dielectric Barrier Discharges with Asymmetric Gamma‐Coefficients

Cited by 14 publications

References 10 publications

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Self-stabilized discharge filament in plane-parallel barrier discharge configuration: formation, breakdown mechanism, and memory effects

Generation of energetic electrons in pulsed microwave plasmas

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