NDLI: Performance of NEG getter materialin a sealed reflex-triode vircator at 225 $A/cm^{2}$

Content Provider	IEEE Xplore Digital Library
Author	Kelly, P. Parson, J.M. Lynn, C.F. Mankowski, J.J. Dickens, J.C. Neuber, A.A.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Texas Tech Univ., Lubbock, TX, USA (Kelly, P.; Parson, J.M.; Lynn, C.F.; Mankowski, J.J.; Dickens, J.C.; Neuber, A.A.)
Abstract	Summary form only given. This study focuses on the use of non-evaporable getter (NEG) materials in a high power microwave (HPM) virtual-cathode oscillator (vircator). The vircator has a background pressure in the low $10^{-9}$ torr range with a vacuum volume of 5 L backed by a small 20 L/s ion pump. Presently, the source is driven by an 80 J, 300 kV Marx generator with a current density of 225 $A/cm^{2}$ and pulse width of 100 ns. Initial current pulses increases the chamber pressure to the low $10^{-6}$ torr range desorbing approximately $10^{14}$ $particles^{1,2}.$ Reduction in the number of particles desorbed decreases an order of magnitude after approximately 2,000 current pulses, with no further noticeable decrease after 10,000 $pulses^{3}.$ The HPM system will eventually be modified to operate at 500 Hz with a pulse width between 10-20 ns. In first order approximations, a pumping speed of 2500 L/s will be needed to pump $10^{14}$ particles within 2 ms from a 5 L volume. This corresponds to a surface area of approximately 2400 $cm^{2}$ for a zirconium-vanadium-iron (ZrVFe) getter material. An introduction of NEG materials into the vacuum chamber will aid in achieving repetitive operation; and preliminary results on the use of the NEG material in the vacuum environment will be presented. A residual gas analyzer (RGA) and an inverted-magnetron cold cathode vacuum sensor are used for the gas diagnostics and are rated to survive the 300°C, 72 hour vircator bake out process.
Starting Page	1
Ending Page	1
File Size	118858
Page Count	1
File Format	PDF
ISBN	9781467351713
ISSN	07309244
DOI	10.1109/PLASMA.2013.6635086
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Materials Cathodes Approximation methods Gettering Educational institutions Carbon dioxide Power electronics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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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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