Multipeak behavior and mode transition of a homogeneous barrier discharge in atmospheric pressure helium

Wang, Dezhen; Wang, Yanhui; Liu, Chengsen

doi:10.1016/j.tsf.2005.08.099

Cited by 47 publications

(28 citation statements)

References 14 publications

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“…Following a breakdown, a combination of residual charge, enhanced by the presence of N 2 impurity, and increasing applied voltage can generate a sufficiently high voltage across the gap that again exceeds the breakdown voltage of the gap resulting in a train of discharges that can therefore persist until close to the applied voltage maximum. However, it should be noted that the train of discharges observed in this system [27] are different from those previously reported [9,32], in that the discharge current peaks do not sequentially decrease in magnitude. This may be because in 123 this larger area device, the discharge events are occurring at different locations on the electrode.…”

Section: Time Resolved Electrical and Emission Behaviourcontrasting

confidence: 95%

Correlation Between the Electrical and Optical Properties of an Atmospheric Pressure Plasma During Siloxane Coating Deposition

Twomey¹,

Nindrayog

Niemi

et al. 2010

Plasma Chem Plasma Process

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The effect of varying process parameters on atmospheric plasma characteristics and properties of nanometre thick siloxane coatings is investigated in a reel-to-reel deposition process. Varying plasma operation modes were observed with increasing applied power for helium and helium/oxygen plasmas. The electrical and optical behaviour of the dielectric barrier discharge were determined from current/voltage, emission spectroscopy and time resolved light emission measurements. As applied power increased, multiple discharge events occurred, producing a uniform multi-peak pseudoglow discharge, resulting in an increase in the discharge gas temperature. The effects of different operating modes on coating oxidation and growth rates were examined by injecting hexamethyldisiloxane liquid precursor into the chamber under varying operating conditions. A quenching effect on the plasma was observed, causing a decrease in plasma input power and emission intensity. Siloxane coatings deposited in helium plasmas had a higher organic component and higher growth rates than those deposited in helium/oxygen plasmas.

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Section: Time Resolved Electrical and Emission Behaviourcontrasting

confidence: 95%

Correlation Between the Electrical and Optical Properties of an Atmospheric Pressure Plasma During Siloxane Coating Deposition

Twomey¹,

Nindrayog

Niemi

et al. 2010

Plasma Chem Plasma Process

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“…Large accumulation of charges increases the external voltage significantly, making multiple breakdowns feasible. 46 In addition to undergoing this transition from single peak to multi-peak behaviour in the positive half cycle of applied voltage, the amplitude of the current pulses for DBD with partial packing also increases in comparison to DBD without any packing. This signifies a stronger discharge and is in accordance with previously reported studies, 16,41 where a slight increase in current amplitude is observed on use of catalyst packing.…”

Section: Resultsmentioning

confidence: 97%

Fluid model for a partially packed dielectric barrier discharge plasma reactor

Gadkari

2017

Physics of Plasmas

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In this work, a two-dimensional numerical \ud fluid model is developed for a partially\ud packed dielectric barrier discharge (DBD) in pure helium. In\ud fluence of packing on\ud the discharge characteristics is studied by comparing the results of DBD with partial\ud packing with those obtained for DBD with no packing. In the axial partial packing\ud configuration studied in this work, the electric field strength was shown to be en\ud hanced at the top surface of the spherical packing material and at the contact points\ud between the packing and the dielectric layer. For each value of applied potential,\ud DBD with partial packing showed an increase in the number of pulses in the current\ud profile in the positive half cycle of the applied voltage, as compared to DBD with\ud no packing. Addition of partial packing to the plasma-alone DBD also led to an\ud increase in the electron and ion number densities at the moment of breakdown. The\ud time averaged electron energy profiles showed that a much higher range of electron\ud energy can be achieved with the use of partial packing as compared to no packing\ud in a DBD, at the same applied power. The spatially and time averaged values over\ud one voltage cycle also showed an increase in power density and electron energy on\ud inclusion of partial packing in the DBD. For the applied voltage parameters studied\ud in this work, the discharge was found to be consistently homogeneous and showed\ud the characteristics of atmospheric pressure glow discharge

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“…This enhances the gap voltage and makes multiple breakdown possible in one cycle. 35 However, the time interval of the voltage cycle also plays a significant role. At higher frequencies when sufficient time is not there in between the voltage cycles, the discharge does not undergo multiple breakdowns.…”

Section: -3mentioning

confidence: 99%

“…24,44,45 Many researchers have investigated homogeneous discharge in noble gases such as helium, neon, and argon; however, the exact mechanism behind homogeneity of discharge at atmospheric pressure is still under debate. 10,22,34,35,46 Many factors such as high pre-ionization levels, higher threshold energy of metastables, streamer coupling, penning ionization (with …”

Section: B Mode Of Dischargementioning

confidence: 99%

Numerical investigation of co-axial DBD: Influence of relative permittivity of the dielectric barrier, applied voltage amplitude, and frequency

Gadkari

2017

Physics of Plasmas

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In this work, a one-dimensional numerical fluid model is developed for co-axial dielectric barrier discharge in pure helium and a parametric study is performed to systematically study the influence of relative permittivity of the dielectric barrier and the applied voltage amplitude and frequency on the discharge performance. Discharge current, gap voltage, and spatially averaged electron density profiles are presented as a function of relative permittivity and voltage parameters. For the geometry under consideration, both the applied voltage parameters are shown to increase the maximum amplitude of the discharge current peak up to a certain threshold value, above which it stabilized or decreased slowly. The spatially averaged electron density profiles follow a similar trend to the discharge current. Relative permittivity of the dielectric barrier is predicted to have a positive influence on the discharge current. At lower frequency, it is also shown to lead to a transition from Townsend to glow discharge mode. Spatially and time averaged power density is also calculated and is shown to increase with increasing relative permittivity, applied voltage amplitude, and frequency.

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Multipeak behavior and mode transition of a homogeneous barrier discharge in atmospheric pressure helium

Cited by 47 publications

References 14 publications

Correlation Between the Electrical and Optical Properties of an Atmospheric Pressure Plasma During Siloxane Coating Deposition

Correlation Between the Electrical and Optical Properties of an Atmospheric Pressure Plasma During Siloxane Coating Deposition

Fluid model for a partially packed dielectric barrier discharge plasma reactor

Numerical investigation of co-axial DBD: Influence of relative permittivity of the dielectric barrier, applied voltage amplitude, and frequency

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