Electric field filamentation and higher harmonic generation in very high frequency capacitive discharges

Sarveshwar Sharma, N. Sirse, A. Sen, J. S. Wu, M. M. Turner

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The effects of the discharge voltage on the formation and nature of electric field transients in a symmetric, collisionless, very high frequency, capacitively coupled plasma are studied using a self-consistent particle-in-cell (PIC) simulation code. At a driving frequency of 60 MHz and 5 mTorr of argon gas pressure, the discharge voltage is varied from 10 V to 150 V for a fixed discharge gap. It is observed that an increase in the discharge voltage causes filamentation in the electric field transients and to create multiple higher harmonics in the bulk plasma. Correspondingly, higher harmonics, up to 7th harmonic, in the discharge current are also observed. The power in the higher harmonics increases with a rise in the discharge voltage. The plasma density continues to increase with the discharge voltage but in a non-linear manner, whereas, the bulk electron temperature decreases. Meanwhile, the electron energy distribution function evolves from a Maxwellian at lower discharge voltages to a bi-Maxwellian at higher discharge voltages.

Original languageEnglish
Article number365201
JournalJournal of Physics D: Applied Physics
Volume52
Issue number36
DOIs
StatePublished - 4 Jul 2019

Keywords

  • capacitive discharges
  • electric field
  • electron energy distribution function
  • higher harmonics
  • PIC simulation
  • very high frequency

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