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Article Dans Une Revue Physical Review Letters Année : 2015

Strong Ionization Asymmetry in a Geometrically Symmetric Radio Frequency Capacitively Coupled Plasma Induced by Sawtooth Voltage Waveforms

Bastien Bruneau
  • Fonction : Auteur
T. Gans
  • Fonction : Auteur
D. O'Connell
  • Fonction : Auteur
Arthur Greb
  • Fonction : Auteur
E.V. Johnson
Jean-Paul Booth

Résumé

The ionization dynamics in geometrically symmetric parallel plate capacitively coupled plasmas driven by radio frequency tailored voltage waveforms is investigated using phase resolved optical emission spectroscopy (PROES) and particle-in-cell (PIC) simulations. Temporally asymmetric waveforms induce spatial asymmetries and offer control of the spatiotemporal dynamics of electron heating and associated ionization structures. Sawtooth waveforms with different rise and fall rates are employed using truncated Fourier series approximations of an ideal sawtooth. Experimental PROES results obtained in argon plasmas are compared with PIC simulations, showing excellent agreement. With waveforms comprising a fast voltage drop followed by a slower rise, the faster sheath expansion in front of the powered electrode causes strongly enhanced ionization in this region. The complementary waveform causes an analogous effect in front of the grounded electrode.
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Dates et versions

hal-01549359 , version 1 (28-06-2017)

Identifiants

Citer

Bastien Bruneau, T. Gans, D. O'Connell, Arthur Greb, E.V. Johnson, et al.. Strong Ionization Asymmetry in a Geometrically Symmetric Radio Frequency Capacitively Coupled Plasma Induced by Sawtooth Voltage Waveforms. Physical Review Letters, 2015, 114, pp.125002. ⟨10.1103/PhysRevLett.114.125002⟩. ⟨hal-01549359⟩
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