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Simulation of RF coronas using the FE-FCT method.

G E Georghiou1, A C Metaxas

  • 1Engineering Department, University of Cambridge, U.K.

The Journal of Microwave Power and Electromagnetic Energy : a Publication of the International Microwave Power Institute
|December 1, 2000
PubMed
Summary

Corona discharges, the precursor to arcs in radio frequency heating, were numerically studied. Higher operating frequencies increase corona onset voltage, reducing arc risk, while lower pressures increase arc likelihood in vacuum systems.

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Area of Science:

  • Plasma Physics
  • Electrical Engineering

Background:

  • Arcs in radio frequency (RF) heating systems can disrupt operation.
  • Corona discharges are identified as the primary precursor to these arcs.
  • Understanding corona discharge behavior is crucial for mitigating arc formation.

Purpose of the Study:

  • To numerically investigate corona discharges as precursors to arcs in RF heating.
  • To analyze the influence of operating frequency and pressure on discharge characteristics.
  • To determine factors affecting arc proneness in RF systems.

Main Methods:

  • Numerical simulation using the finite element-flux corrected transport technique.
  • Modeling a point-plane configuration as an approximation for an RF applicator.
  • Investigating effects of varying operating frequency and pressure.

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Main Results:

  • Increased operating frequency in the RF spectrum led to higher corona onset voltage.
  • Decreased pressure resulted in a lower corona onset voltage.
  • Higher frequencies correlate with reduced arc-prone behavior, unlike low-pressure conditions.

Conclusions:

  • Operating frequency significantly impacts corona onset voltage and arc formation.
  • Low-pressure environments enhance the possibility of arc formation in RF systems.
  • Findings provide insights into designing more robust RF heating systems by managing corona discharges.