Impact of CH4 addition on the electron properties and electric field dynamics in a Ar nanosecond-pulsed dielectric barrier discharge

Chen, Timothy Y.; Mao, Xingqian; Zhong, Hongtao; Lin, Ying; Liu, Ning; Goldberg, Benjamin M.; Ju, Yiguang; Kolemen, Egemen

doi:10.1088/1361-6595/acab81

Title: Impact of CH₄ addition on the electron properties and electric field dynamics in a Ar nanosecond-pulsed dielectric barrier discharge

Journal Article · 02 January 2022 · Plasma Sources Science and Technology

DOI: https://doi.org/10.1088/1361-6595/acab81 · OSTI ID:1906150

^[1]; Mao, Xingqian ^[2];

^[2]; Lin, Ying ^[2]; Liu, Ning ^[2];

^[3]; Ju, Yiguang ^[2]; Kolemen, Egemen ^[4]

Princeton Univ., NJ (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States); Princeton University
Princeton Univ., NJ (United States)
Princeton Univ., NJ (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Non-equilibrium plasmas derive their low temperature reactivity from producing and driving energetic electrons and active species under large electric fields. Therefore, the impact of reactants on the plasma properties including electron number density, electric field, and electron temperature is critical for applications such as plasma CH₄ reforming. Due to experimental complexity, electron properties and the electric field are rarely measured together in the same discharge. Here, we combine time-resolved Thomson scattering and electric field induced second harmonic generation (EFISH) to probe electron temperature, electron density, and electric field strength in a 60 Torr CH₄/Ar nanosecond-pulsed dielectric barrier discharge (ns-DBD) while varying the CH₄ mole fraction from 0 to 8%. These measurements are compared to a 1-D numerical model to benchmark its predictions and identify areas of uncertainty. Nonlinear coupling between CH₄ addition, electron temperature, electron density, and the electric field was directly observed. Contrary to previous measurements in He, the electron temperature increased with CH₄ mole fraction. This rise in electron temperature is identified as electron heating by residual electric fields that increased with larger CH₄ mole fraction. Moreover, the electron number density has been found to decrease rapidly with the increase of methane mole fraction. Comparison of these measurements with the model yielded better agreement at higher CH₄ mole fractions and with the usage of ab initio calculated Ar electron-impact cross-sections from the B-spline R-matrix (BSR) database. Furthermore, the calculated plasma properties are shown to be sensitive to the residual surface charge implanted on the quartz dielectric surfaces. Without considering surface charge in the simulations, the calculated electric field profiles agreed well with the measurements, but the electron properties were underpredicted by more than a factor of three. Therefore, measurements of either the electric field or electron properties measurements alone are insufficient to fully validate modelling predictions.

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Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: SC0020233

OSTI ID:: 1906150

Report Number(s):: DOE-Princeton-0020233

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 12 Vol. 31; ISSN 0963-0252

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Impact of CH₄ addition on the electron properties and electric field dynamics in a Ar nanosecond-pulsed dielectric barrier discharge