Related Experiment Video
Updated: Jun 23, 2025

How to Ignite an Atmospheric Pressure Microwave Plasma Torch without Any Additional Igniters
Published on: April 16, 2015
Coherent High-Frequency Axial Oscillations in a Partially Magnetized Direct Current Magnetron Discharge
1Stanford Plasma Physics Laboratory, Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA.
Abstract:
High-frequency oscillations are observed in a neon plasma of a direct current magnetron discharge. At low discharge currents, we see highly coherent 60 MHz fluctuations. Above a distinct current threshold, secondary 5-10 MHz fluctuations emerge in addition to turbulent fluctuations in the 60-100 MHz range. The oscillations in the total discharge current suggest axial wave propagation. A lower-hybrid wave theory is invoked to model the high-frequency oscillations. We attribute the low-frequency modes to a turbulence-driven inverse cascade process, as suggested by recent simulations.
Related Concept Videos
Oscillations In An LC Circuit
Atomic Nuclei: Nuclear Relaxation Processes
Electromagnetic Waves
Standing Waves in a Cavity
Atomic Nuclei: Magnetic Resonance
Faraday Disk Dynamo

