Theoretical Study on the Characteristics of Atmospheric Radio Frequency Discharges by Altering Electrode Gap

In this paper, we present a theoretical study on the discharge characteristics of radio-frequency discharges at atmospheric pressure driven by a higher frequency of 40.68 MHz while the electrode gap is altered. Based on the analytical equations and simulation data from a one-dimensional fluid model, an optimal gap between electrodes, at which the largest electron density is obtained, can be observed under a constant power condition; however, as the electrode gap increases the time-averaged electron temperature decreases, and the underpinning physics is also discussed based on the simulation results. This study indicates that at a constant power by choosing an appropriate electrode spacing, the rf discharge can be effectively optimized at atmospheric pressure.

[1]  Qingquan Li,et al.  Electrode-Gap Effects on the Electron Density and Electron Temperature in Atmospheric Radio-Frequency Discharges , 2013, IEEE Transactions on Plasma Science.

[2]  Yuantao Zhang,et al.  Modeling Study on the Generation of Reactive Oxygen Species in Atmospheric Radio-Frequency Helium–Oxygen Discharges , 2012 .

[3]  Jae Koo Lee,et al.  Electron heating mode transition induced by ultra-high frequency in atmospheric microplasmas for biomedical applications , 2012 .

[4]  W. Shang,et al.  The recovery of glow-plasma structure in atmospheric radio frequency microplasmas at very small gaps , 2011 .

[5]  Yuantao Zhang,et al.  Frequency effects on the electron density and α-γ mode transition in atmospheric radio frequency discharges , 2011 .

[6]  M. Rong,et al.  He+O2+H2O plasmas as a source of reactive oxygen species , 2011 .

[7]  Qingquan Li,et al.  The characteristics of atmospheric radio frequency discharges with frequency increasing at a constant power density , 2010 .

[8]  Davide Mariotti,et al.  Microplasmas for nanomaterials synthesis , 2010 .

[9]  D. Mariotti,et al.  Experimental study of a planar atmospheric-pressure plasma operating in the microplasma regime. , 2009, Physical review. E, Statistical, nonlinear, and soft matter physics.

[10]  J. Walsh,et al.  Atmospheric glow discharges from the high-frequency to very high-frequency bands , 2008 .

[11]  J. Walsh,et al.  Atmospheric-pressure gas breakdown from 2 to 100 MHz , 2008 .

[12]  W. Choe,et al.  Driving frequency effects on the characteristics of atmospheric pressure capacitive helium discharge , 2008 .

[13]  J. Boeuf,et al.  Numerical Model of an Argon Atmospheric Pressure RF Discharge , 2008, IEEE Transactions on Plasma Science.

[14]  S. Reuter,et al.  Absolute atomic oxygen density profiles in the discharge core of a microscale atmospheric pressure plasma jet , 2008 .

[15]  Gregory Fridman,et al.  Applied Plasma Medicine , 2008 .

[16]  A. Fridman,et al.  Atmospheric pressure radio frequency glow discharges in argon: effects of external matching circuit parameters , 2008 .

[17]  Jing Zhang,et al.  Modes in a pulse-modulated radio-frequency dielectric-barrier glow discharge , 2008 .

[18]  James L. Walsh,et al.  Microplasmas: sources, particle kinetics, and biomedical applications , 2008 .

[19]  D. Mariotti.  Nonequilibrium and effect of gas mixtures in an atmospheric microplasma , 2008, 1003.2714.

[20]  F. Iza,et al.  Electron kinetics in radio-frequency atmospheric-pressure microplasmas. , 2007, Physical review letters.

[21]  R. Hicks,et al.  Comparison of an atmospheric pressure, radio-frequency discharge operating in the α and γ modes , 2005 .

[22]  A. Lichtenberg,et al.  Principles of Plasma Discharges and Materials Processing: Lieberman/Plasma 2e , 2005 .

[23]  Jianjun Shi,et al.  Mechanisms of the α and γ modes in radio-frequency atmospheric glow discharges , 2005 .

[24]  Xiaohui Yuan,et al.  Computational study of capacitively coupled high-pressure glow discharges in helium , 2003 .

[25]  Jaeyoung Park,et al.  Discharge phenomena of an atmospheric pressure radio-frequency capacitive plasma source , 2001 .

[26]  A. Kulikovsky.  The structure of streamers in N2. I. fast method of space-charge dominated plasma simulation , 1994 .

[27]  A. Lichtenberg,et al.  Principles of Plasma Discharges and Materials Processing , 1994 .