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Related Experiment Videos

rf Electrode sheath formation near a concave electrode.

K E Orlov1, D A Malik, T V Chernoiziumskaya

  • 1Plasma Physics Department, St. Petersburg State Polytechnical University, Polytechnicheskaya 29, St. Petersburg 195251, Russia.

Physical Review Letters
|March 6, 2004
PubMed
Summary

Secondary electron emission significantly influences plasma behavior near concave electrodes. Plasma can spontaneously leak into electrode cavities, impacting device performance.

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Note: Laser-cut molybdenum grids for a retarding field energy analyzer.

The Review of scientific instruments·2017

Area of Science:

  • Plasma physics
  • Surface science
  • Electrode engineering

Background:

  • Understanding plasma behavior near complex electrode geometries is crucial for various applications.
  • The electrode sheath, a critical plasma-plasma interface, is influenced by electrode shape and material properties.
  • Secondary electron emission is a known phenomenon affecting plasma dynamics.

Purpose of the Study:

  • To experimentally investigate plasma and ion flux formation around a concave electrode.
  • To determine the role of secondary electron emission in plasma molding on electrode surfaces.
  • To observe plasma behavior within electrode cavities where dimensions are comparable to the electrode sheath length.

Main Methods:

  • Experimental plasma generation and diagnostics.

Related Experiment Videos

  • Utilizing a concave electrode with specific geometric constraints.
  • Measuring ion flux and observing plasma distribution near the electrode surface.

    • Main Results:

    • Secondary electron emission was found to be a critical factor in plasma molding over the concave electrode.
    • Plasma exhibits a tendency to "self-leakage" into electrode cavities.
    • The interplay between electrode geometry and secondary electron emission shapes the plasma sheath.

    Conclusions:

    • Secondary electron emission plays a vital role in controlling plasma distribution on concave electrode surfaces.
    • Plasma self-leakage into cavities is a significant phenomenon affecting plasma confinement and electrode performance.
    • These findings have implications for the design and operation of plasma devices with complex electrode structures.