Gas evolution measurements in a sealed vircator tube

John Vara, John Walter, James Dickens

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

The gases evolved during operation of high power microwave devices, such as virtual cathode oscillators (vircators), can be detrimental to their power output, output pulse width, and maximum pulse repetition rate. Gases are evolved both from processes at the cathode (such as explosive electron emission) and at the anode (due to heating from the electron beam). In this project, a residual gas analyzer and pressure measurements have been utilized to characterize the gases generated during operation of a sealed vircator tube. The background pressure in the tube before firing is in the ultra-high vacuum range (∼10-8 Torr). The vircator is not pumped on during firing. After firing, the measurements are made, and then the tube is ion pumped back down to the background pressure before the next shot. Multiple anode and cathode materials will be tested, with measurements made of both the quantity and types of gases evolved during firing. Example test materials include stainless steel, OFHC copper, copper tungsten, and tantalum. For all tests, the vircator is driven directly from a low impedance Marx generator, with no intermediate pulse forming. The system design and diagnostic systems are described, and gas quantity and composition data is presented.

Original languageEnglish
Title of host publicationProceedings of the 2010 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2010
Pages608-611
Number of pages4
DOIs
StatePublished - 2010
Event2010 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2010 - Atlanta, GA, United States
Duration: May 23 2010May 27 2010

Publication series

NameProceedings of the 2010 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2010

Conference

Conference2010 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2010
CountryUnited States
CityAtlanta, GA
Period05/23/1005/27/10

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  • Cite this

    Vara, J., Walter, J., & Dickens, J. (2010). Gas evolution measurements in a sealed vircator tube. In Proceedings of the 2010 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2010 (pp. 608-611). [5958432] (Proceedings of the 2010 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2010). https://doi.org/10.1109/IPMHVC.2010.5958432