Direct observation of electrons in microwave vacuum components

Z. C. Shaw, A. Garcia, M. Powell, J. C. Dickens, J. J. Mankowski, A. A. Neuber

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Apparatus which is used to directly observe electrons in microwave vacuum components was designed and implemented into a WR-284 like waveguide operated at 2.85 GHz with up to approx. 1 MW power. To generate desired electric field levels for driving secondary emission, the waveguide structure is manipulated by reducing the test section height to 6 mm from the standard WR-284 rectangular waveguide height of 34 mm. Both test and standard sections were operated in the dominant TE10 mode. A 1 mm aperture was cut into the broadside wall of the waveguide section enabling a portion of electrons in the waveguide to enter a properly biased electron multiplier tube mounted atop of the test section. Waveforms are presented showing the direct measurement of electrons, providing a local detection method with nanosecond temporal resolution. Future work will incorporate the test setup for multipactor studies.

Original languageEnglish
Article number054702
JournalReview of Scientific Instruments
Issue number5
StatePublished - May 1 2019


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