Pressure effect on a tandem hollow cathode discharge in argon

Fu, Yangyang; Verboncoeur, John P.; Christlieb, Andrew

doi:10.1063/1.5004681

Cited by 19 publications

(9 citation statements)

References 64 publications

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“…However, the fluid model provides fast calculation speeds and good descriptions of the basic characteristics of HCD. It is also widely used in HCD studies, especially in simulation of high-pressure HCD [15][16][17][18].…”

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.

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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: 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.

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show abstract

“…36,37 Relevant reactions and their coefficients for argon plasma chemistry are taken from Ref. 38. The cross sections of electron impact reactions are originally referred from Biagi database, and the Boltzmann solver (BOLSIGþ) is used.…”

Section: Model Descriptionmentioning

confidence: 99%

Effect of surface protrusion on plasma sheath properties in atmospheric microdischarges

Zhang

Verboncoeur

et al. 2018

Physics of Plasmas

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The electric field enhancement due to the presence of cathode surface protrusion is investigated in atmospheric microdischarges with the goal of identifying the plasma sheath properties (such as cathode sheath thickness and electric field distortion). The electric field enhancement caused by surface protrusion is examined by adjusting the aspect ratio and the protrusion size. It is found that the cathode electric field enhancement depends strongly (weakly) on the aspect ratio (size) of the protrusion when it is much smaller than the discharge gap distance. In particular, the axial electric field in both vacuum and discharges becomes nonlinear with the protrusion on the cathode. The cathode sheath thicknesses obtained by two different methods are compared. With the same axial (or radial) protrusion dimension, increasing the aspect ratio will result in a significant decrease in the sheath thickness, whereas increasing the axial protrusion size with an unchanged aspect ratio will only lead to a slight decrease in the sheath thickness. The results contribute to predicting the relative plasma sheath properties from the geometrical parameter of the surface protrusion in atmospheric microdischarges.

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“…Thus, some researchers and institutions employed different numerical methods to study the physical mechanisms for the plasma energy balance and transfer in a HC. The solutions for the theoretical models regarding the HC discharge and plasma parameters mainly concentrated on the fluid numerical approach [3][4][5]. The particle-in-cell (PIC) method was successfully applied to the plasma simulations for Hall-effect thrusters [6] and ion engines [7].…”

mentioning

confidence: 99%

Modeling on plasma energy balance and transfer in a hollow cathode

Cao¹,

Ren²,

Tang³

et al. 2019

J. Phys. D: Appl. Phys.

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Nomenclature D = 1.2 × 10 6 A (m 2 • K 2 ) −1 , constant defined by material e = 1.602 × 10 −19 C, elementary charge E = Electric field E e = Electron kinetic energy E i = Ion kinetic energy E wall = Electric field at the emitter surface j = Current density j e = Electron current density j i = Ion current density I d = Discharge current I e = Electron current I i = Ion current k = 1.38 × 10 -23 J K −1 , Boltzmann constant m = Particle mass

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Pressure effect on a tandem hollow cathode discharge in argon

Cited by 19 publications

References 64 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

Effect of surface protrusion on plasma sheath properties in atmospheric microdischarges

Modeling on plasma energy balance and transfer in a hollow cathode

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