Experimental Results of the Coaxial Multipactor Experiment (CoMET)

Details Experimental Results of the Coaxial Multipactor Experiment (CoMET) Experimental Results of the Coaxial Multipactor Experiment (CoMET)

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dppcp1019g&link_type=abstract

American Physical Society, 46th Annual Meeting of the Division of Plasma Physics, 15-19 November, 2004, Savannah, GA. MEETING I

Physics

Plasma Physics

Scientific paper

Electron multipactoring can occur in vacuum coaxial transmission lines found in ion cyclotron heating systems. Because of the non-linear electric field of coaxial lines, the multipactor can appear at many different electron energies and trajectories. Simple particle tracking codes show that the coaxial multipactor can occur at different harmonic modes on one or two surfaces. The Coaxial Multipactor Experiment (CoMET) is a high Q resonator with a 6 inch vacuum coaxial transmission line section which supports the multipactor discharge. CoMET specifically studies coaxial multipactoring with an array of retarding potential analyzers and directional couplers to determine the limiting voltage, electron energy distribution, spatial location, and current density as a function of frequency and pressure. Results from a single probe suggest the multipactor occurs in a small localized area, while some electrons move throughout the vacuum region, thermalizing on the chamber walls. These low temperature electrons could possibly move into a high voltage region, seeding an arc in that area. Current experimental results and future experiments are presented.

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