One-Dimensional Modeling Studies of the Gaseous Electronics Conference Rf Reference Cell

Tr, Govindan; Meyyappan, M.

doi:10.6028/jres.100.035

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…The approximation is used by neglecting the time and inertia derivatives in the momentum equation and deriving a modified continuity equation that is dependent on diffusion and drift velocity components in addition to reaction rate source terms (shown in equation ( 5)). The reaction rates and transport properties were obtained from the literature [30][31][32]. Further, the electron energy equation need not be solved as it is calculated from BOLSIG+.…”

Section: Discharge Physics-description Of One-dimensional Appj Modelmentioning

confidence: 99%

Numerical and experimental investigation of the stability of radio-frequency (RF) discharges at atmospheric pressure

Chirokov

Khot

Gangoli

et al. 2009

Plasma Sources Sci. Technol.

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The stability and uniformity of a radio-frequency (RF) discharge is limited by a critical power density. Beyond this critical power density, instability occurs in the form of physical changes in the plasma (such as contraction due to arcing). The RF discharge used in this study is the non-equilibrium Atmospheric Pressure Plasma Jet (APPJ ® ) developed by Apjet, Inc. This discharge is known to operate uniformly in helium gas. However, for some proposed applications such as surface modification, there is a need to operate with reactive gases such as O 2 . Our experimental studies show that addition of molecular gas to a discharge operating in helium increases its power density (W cm −2 ), until it reaches the critical unstable arcing limit. Moreover, an increase in the frequency of operation (from 13 to 27 MHz) allows the plasma to sustain higher molecular gas concentrations and power densities before instability occurs. Further, it is observed that this critical power density is dependent on the type of molecular gas added. These results provide a motivation for the development of a mathematical model that can provide insight into the causes of instability and potential methods of suppression. The two commonly studied modes of instability are (1) thermal instability (TI) and (2) α-γ -arc mode transition. For the APPJ ® discharge conditions, the development time scales of TI are much longer (∼1 ms) as compared with discharge oscillation period (∼100 ns). Hence, if the instability was indeed thermal, discharge frequency increase would have no consequence, contrary to experimental findings. A 1D fluid model based on the local field approximation is developed to study instability in APPJ ® discharge. The analysis of modeling results confirmed our hypothesis that the instability development actually takes place via breakdown of sheath i.e. α-γ -arc mode transition and not by TI.

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Section: Discharge Physics-description Of One-dimensional Appj Modelmentioning

confidence: 99%

Numerical and experimental investigation of the stability of radio-frequency (RF) discharges at atmospheric pressure

Chirokov

Khot

Gangoli

et al. 2009

Plasma Sources Sci. Technol.

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“…Use of the GEC Cell has stimulated the plasma modeling community. As seen in the two review articles contained in this Special Issue of the Journal of Research of the National Institute of Standards and Technology [ 14 , 15 ], significant progress has been made in the modeling of various discharges in the GEC Cell, due in part to the availability of experimental data for comparison. Additionally, the emergence of the reference-cell concept prompted the modeling community to initiate a “benchmark model comparison,” where each modeler applied their own model to a given set of experimental conditions [ 16 ].…”

Section: Significant Resultsmentioning

confidence: 99%

The Gaseous Electronics Conference RF Reference Cell - An Introduction

Jk¹,

Ke²

1995

J. Res. Natl. Inst. Stand. Technol.

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This paper provides an introduction to the Gaseous Electronics Conference (GEC) RF Reference Cell, and to the articles published in this Special Issue of the Journal of Research of the National Institute of Standards and Technology. A brief summary of the history and purpose of the Reference Cell concept is presented, and recent changes to the GEC Cell design are documented. The paper concludes with highlights of research performed on GEC Cells, and with an appendix of all known publications that present research performed on GEC Cells.

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“…Elastic collision is the dominant volumetric electron energy loss in atmosphere argon glow discharge. However, elastic collision loss is negligible in low pressure glow discharge and is often neglected in the modeling of glow discharge [33] . Fig.…”

Section: Basic Plasma Characteristicsmentioning

confidence: 99%

Kinetics Characteristics and Bremsstrahlung of Argon DC Discharge Under Atmospheric Pressure

Liu

Xian³

et al. 2013

Plasma Sci. Technol.

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An improved self-consistent, multi-component, and one-dimensional plasma model for simulating atmospheric pressure argon glow discharge is presented. In the model, both the plasma hydrodynamics model and chemical model are considered. The numerical simulation is carried out for parallel-plate geometry with a separation of 0.06 cm. The results show that Ar * plays a major role in the discharge, which is mainly produced by ground state excitation reaction. The electron temperature reaches its maximum in the cathode sheath but maintains a low value (0.23 eV) in bulk plasma. Elastic collision is the dominant volumetric electron energy loss in atmosphere argon glow discharge, which is negligible in low pressure argon glow discharge. The metastable step-wise ionization is the main mechanism for electron production to sustain the discharge. However, the highest contribution to electron production rate is ground state ionization reaction. The bremsstrahlung power density is related to electric voltage. With the increase of the electric voltage, the bremsstrahlung power density increases, namely, the strength of ultraviolet radiation spectrum enhances in the cathode sheath.

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One-Dimensional Modeling Studies of the Gaseous Electronics Conference Rf Reference Cell

Cited by 11 publications

References 14 publications

Numerical and experimental investigation of the stability of radio-frequency (RF) discharges at atmospheric pressure

Numerical and experimental investigation of the stability of radio-frequency (RF) discharges at atmospheric pressure

The Gaseous Electronics Conference RF Reference Cell - An Introduction

Kinetics Characteristics and Bremsstrahlung of Argon DC Discharge Under Atmospheric Pressure

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