Observation of dust stream formation produced by low current, high voltage cathode spots | Zendy

John E. Foster | Zendy

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Observation of dust stream formation produced by low current, high voltage cathode spots

Author(s) -

John E. Foster

Publication year - 2004

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.1688441

Subject(s) - cathode , materials science , acceleration voltage , deposition (geology) , scanning electron microscope , micrometer , high voltage , optics , voltage , electron , nanotechnology , optoelectronics , analytical chemistry (journal) , physics , chemistry , cathode ray , composite material , paleontology , chromatography , quantum mechanics , sediment , biology

Macroparticle acceleration driven by low current, high voltage cathode spots has been investigated for potential applications ranging from micrometeoroid simulation to nanoparticle deposition/implantation. Acceleration by this process was observed to occur when nanometer and micrometer-sized particles were exposed to a high voltage pulse in the presence of a plasma discharge. The applied negative voltage pulse initiates the formation of multiple, high voltage, low current cathode spots which provide the mechanism of actual acceleration of the charged dust particles. Dust streams generated by this process were detected using laser scattering techniques. Cathode spot behavior was also documented. The particle impact craters observed at the surface of downstream witness badges were documented using scanning electron microscopy and light microscopy. The observed impacts suggest the presence of energetic macroparticles formed during this process.

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