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Title: Ionization instability induced striations in low frequency and pulsed He/H2O atmospheric pressure plasmas

Abstract

In previous work [Kawamura et al., Plasma Sources Sci. Technol. 25, 054009 (2016)] and [Kawamura et al., J. Phys. D: Appl. Phys. 50, 145204 (2017)], 1D kinetic particle-in-cell (PIC) simulations of narrow gap (1 to 4 mm), high frequency (27 MHz) or dc-driven, He/2%H2O atmospheric pressure plasmas (APPs) showed an ionization instability resulting in standing striations (spatial oscillations) in the bulk plasma. We developed a steady-state striation theory which showed that the striations are due to non-local electron kinetics. In both the high frequency and dc-driven cases, the equilibrium electron density n0 in the plasma bulk was stationary. In this work, we first conduct 1D PIC simulations of a 1 mm gap He/2%H2O APP, driven by a sinusoidal current at a low frequency of f = 50 kHz such that ω = 2πf is well below the ionization frequency νiz. In this case, n0 varies with time, and we observe a time-varying instability which quasistatically depends on n0(t). At each phase of the rf cycle, the discharge resembles a dc discharge at the same n0. At higher frequencies (200 kHz–1 MHz), ω approaches νiz, and quasistatic equilibrium at each phase breaks down. The discharge is also driven with a 200more » kHz, 50% duty cycle square wave pulse with a short rise and fall time of 0.1 μs in an attempt to directly measure the striation growth rate s during the on-cycle before it saturated. However, the spike in current during the rise time leads to a spike in electron temperature Te and hence νiz and s at the beginning of the rise which saturated during the beginning of the on-cycle. To predict the instability growth rate and saturation during and after the current spike, we extend our striation theory to include time-varying n0, Te, νiz, as well as terms for the nonlinear saturation and noise floor of the striation amplitude. Furthermore, the time-varying global model predictions are compared to the PIC simulations, showing reasonable agreement.« less

Authors:
 [1];  [1];  [1]
  1. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1515027
Alternate Identifier(s):
OSTI ID: 1418891
Grant/Contract Number:  
SC0001939
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Kawamura, E., Lieberman, M. A., and Lichtenberg, A. J. Ionization instability induced striations in low frequency and pulsed He/H2O atmospheric pressure plasmas. United States: N. p., 2018. Web. https://doi.org/10.1063/1.5016072.
Kawamura, E., Lieberman, M. A., & Lichtenberg, A. J. Ionization instability induced striations in low frequency and pulsed He/H2O atmospheric pressure plasmas. United States. https://doi.org/10.1063/1.5016072
Kawamura, E., Lieberman, M. A., and Lichtenberg, A. J. Wed . "Ionization instability induced striations in low frequency and pulsed He/H2O atmospheric pressure plasmas". United States. https://doi.org/10.1063/1.5016072. https://www.osti.gov/servlets/purl/1515027.
@article{osti_1515027,
title = {Ionization instability induced striations in low frequency and pulsed He/H2O atmospheric pressure plasmas},
author = {Kawamura, E. and Lieberman, M. A. and Lichtenberg, A. J.},
abstractNote = {In previous work [Kawamura et al., Plasma Sources Sci. Technol. 25, 054009 (2016)] and [Kawamura et al., J. Phys. D: Appl. Phys. 50, 145204 (2017)], 1D kinetic particle-in-cell (PIC) simulations of narrow gap (1 to 4 mm), high frequency (27 MHz) or dc-driven, He/2%H2O atmospheric pressure plasmas (APPs) showed an ionization instability resulting in standing striations (spatial oscillations) in the bulk plasma. We developed a steady-state striation theory which showed that the striations are due to non-local electron kinetics. In both the high frequency and dc-driven cases, the equilibrium electron density n0 in the plasma bulk was stationary. In this work, we first conduct 1D PIC simulations of a 1 mm gap He/2%H2O APP, driven by a sinusoidal current at a low frequency of f = 50 kHz such that ω = 2πf is well below the ionization frequency νiz. In this case, n0 varies with time, and we observe a time-varying instability which quasistatically depends on n0(t). At each phase of the rf cycle, the discharge resembles a dc discharge at the same n0. At higher frequencies (200 kHz–1 MHz), ω approaches νiz, and quasistatic equilibrium at each phase breaks down. The discharge is also driven with a 200 kHz, 50% duty cycle square wave pulse with a short rise and fall time of 0.1 μs in an attempt to directly measure the striation growth rate s during the on-cycle before it saturated. However, the spike in current during the rise time leads to a spike in electron temperature Te and hence νiz and s at the beginning of the rise which saturated during the beginning of the on-cycle. To predict the instability growth rate and saturation during and after the current spike, we extend our striation theory to include time-varying n0, Te, νiz, as well as terms for the nonlinear saturation and noise floor of the striation amplitude. Furthermore, the time-varying global model predictions are compared to the PIC simulations, showing reasonable agreement.},
doi = {10.1063/1.5016072},
journal = {Physics of Plasmas},
number = 1,
volume = 25,
place = {United States},
year = {2018},
month = {1}
}

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Figures / Tables:

FIG. 1 FIG. 1: PIC results versus x (m) for a He/2%H2O APP driven with a sinusoidal current of amplitude J0 = 0.23 A/cm2 at f = 50 kHz at eight equally spaced phases (labeled 1 to 8) of an rf half-cycle, showing the (a) electron density n(x) (m-3), (b) ionization ratemore » profile (m-3/s), and (c) rms electric field squared E2(x) [(V/m)2]. The solid and dashed curves correspond to the ascending and descending J(t) quarter-cycles, respectively.« less

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    Works referencing / citing this record:

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