NDLI: Velocity spread in gyrobeams due to cathode edge emission

Content Provider	IEEE Xplore Digital Library
Author	True, R.B. Good, G.R. Hargreaves, T.A. Nguyen, K.T.
Copyright Year	1997
Description	Author affiliation: Litton Electron. Devices Div., San Carlos, CA, USA (True, R.B.)
Abstract	Summary form only given as follows. In analyzing the design of the magnetron injection gun and beam optical system to be used in the 94 GHz NRL/CPI/Litton gyroklyston, a major source of velocity spread in gyrobreams was discovered. Basically, when we set up a detailed model of the region between the emitter strip and the focus electrodes in DEMEOS (used for the simulations), we observed a large amount of current pouring from the edges of the cathode strip due to the level of field penetrating the gaps. This edge emission caused a major increase in velocity spread (both parallel and perpendicular) over the idealized case and by including it, computed and typical observed results are now in line. In the paper, we will show quantitatively how velocity spread is affected by the gap geometry (cathode and focus electrode edges perpendicular to the axis, perpendicular to the cathode, or parallel to the axis). Also, we will show how edge emission affects /spl alpha/, and explain why a cannot be increased beyond a certain level (lower than theory predicts) without mirroring. We will show the difference in results due to use of a thermal beam model, and the inclusion of self-magnetic field. Finally, we will present means of reducing or eliminating edge emission in order to bring velocity spreads down.
File Size	98730
File Format	PDF
ISBN	0780339908
ISSN	07309244
DOI	10.1109/PLASMA.1997.604977
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-05-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cathodes Optical beams Strips Electrodes Magnetic analysis Optical design Stimulated emission Computational modeling Concurrent computing Geometry
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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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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