NDLI: REP-rate operation of a ∼200 KV sealed-tube reflex-triode vircator at ∼200 $A/cm^{2}$

Content Provider	IEEE Xplore Digital Library
Author	Parson, Jonathan M. Bragg, James-William B. Taylor, Mark Barnett, David Kelly, Patrick Lynn, Curtis F. Holt, Shad Dickens, James C. Neuber, Andreas A. Mankowski, John J.
Copyright Year	2014
Description	Author affiliation: Center for Pulsed Power and Power Electronics, Texas Tech University, Dept. of Electrical and Computer Engineering, 2500 Broadway, Lubbock, 79409 USA (Parson, Jonathan M.; Bragg, James-William B.; Taylor, Mark; Barnett, David; Kelly, Patrick; Lynn, Curtis F.; Holt, Shad; Dickens, James C.; Neuber, Andreas A.; Mankowski, John J.)
Abstract	Thermal limitations of anode and cathode materials have shown to negatively impact operation of cold-cathode high-power microwave (HPM) sources. High pulse-repetition-frequency (PRF) operation of these devices exacerbates the problems already experienced in single shot mode where cold-cathode devices, specifically carbon fiber cathodes, are plagued by plasma formation on the anode and cathode followed by plasma/gas expansion that causes impedance collapse of the anode-cathode (A-K) gap. Hence, for frequency stable, repetitive operation, cold-cathode HPM devices require the use of thermally robust electrode materials and ultra-clean surfaces, leading to repeatable tube operation. This study focuses on burst-mode operation of an HPM sealed tube reflex-triode virtual-cathode-oscillator (vircator) for PRFs greater than 100 Hz. The vircator is driven by a 54 J, ∼200 kV Marx generator with an approximate pulse width of 50 ns FWHM, and the vircator chamber has an empty volume of approximately 5 L with background pressures in the low $10^{−9}$ Torr. The anode materials studied include grade-1 titanium (TiG1), nickel 201L (Ni201L), and stainless steel 316L (SS316L); all in combination with a carbon fiber cathode. Empirically observed outgassing characteristics in conjunction with anode thermal modeling are presented under single-shot and rep-rate conditions. In addition, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) techniques were employed to investigate anode and cathode surface integrities before and after vircator operation.
Starting Page	1
Ending Page	1
File Size	48750
Page Count	1
File Format	PDF
ISBN	9781479927111
e-ISBN	9781479927135
DOI	10.1109/PLASMA.2014.7012435
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-05-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Anodes Electron tubes Cathodes Steel
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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