The Fractal Nature of Arc Vacuum Cathode Spots

The Fractal Nature of Arc Vacuum Cathode Spots

What are cathode spots, how are they formed, what are their properties and why do they seem to have self-similar patterns in the emitted light and arc erosion traces?

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References:
https://www.osti.gov/servlets/purl/877322
https://indico.cern.ch/event/680402/contributions/2976651/attachments/1671083/2680777/Model_of_Cathode_Spot_Crater_Formation_and_Development_in_Vacuum_Arc.pdf
https://aip.scitation.org/doi/pdf/10.1063/1.5141406
https://hal.archives-ouvertes.fr/jpa-00255560/document
https://www.researchgate.net/publication/255795280_Peculiarities_of_an_Electric_Discharge_between_an_Electrolytic_Cathode_and_a_Metal_Anode/download
https://arxiv.org/pdf/1901.07336.pdf

00:00 Introduction
00:15 Cathode Spots
00:40 Surface Chemistry
02:21 Fractal Nature: Random Walk
05:12 Fractal Nature: Multi Arc Traces
05:28 Fractal Nature: Optical and Micro Particles
06:18 Ignition Conditions & Spot Fragments
09:56 Summary

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