Low pressure capacitive radio frequency (RF) plasmas are often described by equivalent circuit models based on fluid approaches that predict the self-excitation of resonances, e.g., high frequency oscillations of the total current in asymmetric discharges, but do not provide a kinetic interpretation of these effects. In fact, they leave important questions open: How is current continuity ensured in the presence of energetic electron beams generated by the expanding sheaths that lead to a local enhancement of the conduction current propagating through the bulk? How do the beam electrons interact with cold bulk electrons? What is the kinetic origin of resonance phenomena? Based on kinetic simulations, we find that the energetic beam electrons interact with cold bulk electrons (modulated on a timescale of the inverse local electron plasma frequency) via a time dependent electric field outside the sheaths. This electric field is caused by the electron beam itself, which leaves behind a positive space charge, that attracts cold bulk electrons towards the expanding sheath. The resulting displacement current ensures current continuity by locally compensating the enhancement of the conduction current. The backflow of cold electrons and their interaction with the nonlinear plasma sheath cause the generation of multiple electron beams during one phase of sheath expansion and contribute to a strongly non-sinusoidal RF current. These kinetic mechanisms are the basis for a fundamental understanding of the electron power absorption dynamics and resonance phenomena in such plasmas, which are found to occur in discharges of different symmetries including perfectly symmetric plasmas.
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June 2016
Research Article|
June 16 2016
Kinetic interpretation of resonance phenomena in low pressure capacitively coupled radio frequency plasmas
Sebastian Wilczek;
Sebastian Wilczek
1Department of Electrical Engineering and Information Science,
Ruhr University Bochum
, Bochum, Germany
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Jan Trieschmann;
Jan Trieschmann
1Department of Electrical Engineering and Information Science,
Ruhr University Bochum
, Bochum, Germany
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Denis Eremin;
Denis Eremin
1Department of Electrical Engineering and Information Science,
Ruhr University Bochum
, Bochum, Germany
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Ralf Peter Brinkmann;
Ralf Peter Brinkmann
1Department of Electrical Engineering and Information Science,
Ruhr University Bochum
, Bochum, Germany
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Julian Schulze;
Julian Schulze
1Department of Electrical Engineering and Information Science,
Ruhr University Bochum
, Bochum, Germany
2Department of Physics,
West Virginia University
, Morgantown, West Virginia 26506, USA
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Edmund Schuengel;
Edmund Schuengel
2Department of Physics,
West Virginia University
, Morgantown, West Virginia 26506, USA
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Aranka Derzsi;
Aranka Derzsi
3Institute for Solid State Physics and Optics, Wigner Research Centre for Physics,
Hungarian Academy of Sciences
, Konkoly Thege Miklós str. 29-33, 1121 Budapest, Hungary
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Ihor Korolov
;
Ihor Korolov
3Institute for Solid State Physics and Optics, Wigner Research Centre for Physics,
Hungarian Academy of Sciences
, Konkoly Thege Miklós str. 29-33, 1121 Budapest, Hungary
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Peter Hartmann
;
Peter Hartmann
3Institute for Solid State Physics and Optics, Wigner Research Centre for Physics,
Hungarian Academy of Sciences
, Konkoly Thege Miklós str. 29-33, 1121 Budapest, Hungary
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Zoltán Donkó;
Zoltán Donkó
3Institute for Solid State Physics and Optics, Wigner Research Centre for Physics,
Hungarian Academy of Sciences
, Konkoly Thege Miklós str. 29-33, 1121 Budapest, Hungary
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Thomas Mussenbrock
Thomas Mussenbrock
1Department of Electrical Engineering and Information Science,
Ruhr University Bochum
, Bochum, Germany
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Phys. Plasmas 23, 063514 (2016)
Article history
Received:
April 08 2016
Accepted:
May 25 2016
Citation
Sebastian Wilczek, Jan Trieschmann, Denis Eremin, Ralf Peter Brinkmann, Julian Schulze, Edmund Schuengel, Aranka Derzsi, Ihor Korolov, Peter Hartmann, Zoltán Donkó, Thomas Mussenbrock; Kinetic interpretation of resonance phenomena in low pressure capacitively coupled radio frequency plasmas. Phys. Plasmas 1 June 2016; 23 (6): 063514. https://doi.org/10.1063/1.4953432
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