Numerical study on rectangular microhollow cathode discharge

He, Shoujie; Ouyang, Jiting; He, Feng; Li, Shang

doi:10.1063/1.3555528

Cited by 10 publications

(6 citation statements)

References 16 publications

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“…This finding indicates that a plasma potential well is formed at the discharge center. It is generally believed that formation of this potential well plays an important role in promoting discharge, and the HCE is more evident in this case [14,22]. However, in Model2, discharge occurs in the regime transitioning from Townsend discharge to the formation of the cathode sheath, as shown in figures 5(a) and (b).…”

Section: Different Characteristics Of Discharge In the Two Modelsmentioning

confidence: 89%

“…Therefore, the influence of metastable atoms on the discharge should be considered to allow the numerical models to approximate actual discharge characteristics. While several models without metastable atom involvement can provide a basic description of the characteristics of HCD [22,23]. However, how much difference between models with and without metastable atoms involvement has not been published in the previous work.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of hollow cathode discharge using fluid models with and without metastable atom involvement in helium

He¹,

Qu³

et al. 2018

J. Phys. D: Appl. Phys.

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The characteristics of hollow cathode discharge are simulated by two types of fluid models in helium, one with metastable atom involvement and another without. Discharge current, particle density, and ionization rate are simulated. Results show that metastable atoms exert an important influence on the steady state discharge and the temporal characteristics of this discharge. Discharge is maintained at a lower sustain voltage in the model with metastable atoms than in that without metastable atoms. At the same low sustain voltage, marked differences in quantitative and qualitative characteristics are observed between the two models. With increasing sustain voltage, the discharge parameters simulated by the two models become qualitatively similar, but their quantitative differences increase. The discharge current and electron density in the model with metastable atoms are significantly higher than that in the model without metastable atom involvement at the same sustain voltage. Furthermore, the discharge current and electron density gap simulated by the two models increase as the sustain voltage increases. The difference in characteristics between the two models originate from variation of the contribution of different ionization types to the generation of new electrons at different sustain voltages. With increasing sustain voltage, stepwise ionization originating from metastable atoms becomes increasingly crucial to the discharge. Results further show that the temporal characteristics of the two models are similar when the metastable atom density is low. However, in the model with metastable atoms, discharge current and particle density continue to rise until a steady discharge is obtained after a quasi-steady stage. The different temporal characteristics observed between the models appear to originate from the influence of metastable atoms. The percentage of stepwise ionization relative to the total ionization increases with time.

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Section: Different Characteristics Of Discharge In the Two Modelsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Dynamics of hollow cathode discharge using fluid models with and without metastable atom involvement in helium

He¹,

Qu³

et al. 2018

J. Phys. D: Appl. Phys.

Self Cite

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“…It was shown that this model can reproduce many features observed experimentally and allows one to understand pattern formation in DBDs [28][29][30][31] and dc glow discharges [17,18], formation and propagation of filamentary plasma arrays in high-power microwave breakdown at atmospheric pressure [32,33]. In [34], selforganized patterns on dc glow cathodes have been studied by means of a more realistic model of dc glows, which is in the spirit of models usually employed for detailed simulation of microdischarges in the absence of self-organization [35][36][37][38][39][40] and which accounts for two ionic species, several ionization channels, non-equilibrium population of excited states and comprises an energy equation for the electrons with appropriate boundary conditions (similar to those [41]). It was found that the effect of chemistry and non-locality of electron kinetic and transport coefficients does not cause qualitative changes in selforganization, which explains why the use of the basic model in simulations of self-organization has been successful.…”

Section: The Modelmentioning

confidence: 99%

Study of stability of dc glow discharges with the use of Comsol Multiphysics software

Almeida¹,

Benilov²,

Faria³

2011

J. Phys. D: Appl. Phys.

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Stability of different axially symmetric modes of current transfer in dc glow discharges is investigated in the framework of the linear stability theory with the use of Comsol Multiphysics software. Conditions of current-controlled microdischarges in xenon are treated as an example. Both real and complex eigenvalues have been detected, meaning that perturbations can vary with time both monotonically and with oscillations. In general, results given by the linear stability theory confirm intuitive concepts developed in the literature and conform to the experiment. On the other hand, suggestions are provided for further experimental and theoretical work.

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“…BOEUF et al calculated the current-voltage (I ∼ V ) curve of MHCD and concluded that the discharge in MHCD transits from an abnormal discharge inside the hollow cathode to a normal glow discharge [6] . More work of numerical simulation also discussed the characteristics of MHCD, such as the effect of heating on gas [7] , the sustain discharge with a micro-hollow cathode [8] , self-pulsing phenomena [9] , the discharge of a limited cathode area [10] , and the electric field reversal in MHC [11] .…”

Section: Introductionmentioning

confidence: 99%

Study of the Discharge Mode in Micro-Hollow Cathode

He¹,

He²,

Zhao³

et al. 2012

Plasma Sci. Technol.

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In this study, micro-hollow cathode discharge (MHCD) is investigated by a fluid model with drift-diffusion approximation. The MHC device is a cathode/dielectric/anode sandwich structure with one hole of a diameter D=200 µm. The gas is a Ne/Xe mixture at a pressure p=50∼500 Torr. The evolutions of the discharge show that there are two different discharge modes. At larger pD the discharge plasma and high density excited species expand along the cathode surface and, a ringed discharge mode is formed. At smaller pD, the discharge plasma and the excited species expand along the axis of the cathode aperture to form a columnar discharge.

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Numerical study on rectangular microhollow cathode discharge

Cited by 10 publications

References 16 publications

Dynamics of hollow cathode discharge using fluid models with and without metastable atom involvement in helium

Dynamics of hollow cathode discharge using fluid models with and without metastable atom involvement in helium

Study of stability of dc glow discharges with the use of Comsol Multiphysics software

Study of the Discharge Mode in Micro-Hollow Cathode

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