NDLI: A magnetron using a field emission cathode and a faceted geometry

Content Provider	IEEE Xplore Digital Library
Author	Browning, J. Watrous, J. Luginsland, J. Eaton, M. Kumar, N.
Copyright Year	2010
Description	Author affiliation: NumerEx, Albuquerque, NM87106, USA (Watrous, J.) \|\| Stellar Micro Devices, Austin, TX 78758, USA (Eaton, M.; Kumar, N.) \|\| Boise State University, Boise ID 83 725, USA (Browning, J.) \|\| AFOSR, Arlington, VA 2220, USA (Luginsland, J.)
Abstract	A cylindrical magnetron using Field Emission Arrays (FEAs) is being modeled to determine whether such a device could achieve improved performance. In this approach field emitters are used to provide a distributed cathode. To protect the emitters from the harsh environment of the magnetron interaction space, the emitters are placed below the interaction space in a shielded structure. The anode to cathode electric field is provided by an electrode containing multiple slits. This sole electrode then defines the interaction space and is subject to both the ion and electron bombardment. The emitters are placed below the slits in a configuration with no line of sight to the interaction space. The electrons are emitted along the surface of the cathode substrate, and an adjacent "pusher" electrode is used to direct the electrons away from the surface and out through the slit in the sole electrode. To allow fabrication of the emitters on flat substrates, the cathode is divided into flat facets to approximate a cylindrical cathode. The magnetron being studied is an L-Band device with a -35kV cathode, 900 G magnetic field, anode radius of 2.2 cm, and cathode radius of 1 cm. Electron trajectory modeling using the code $Lorentz2E^{1}$ has been performed to look at the effects of the faceted cathode geometry. This modeling has shown that distorted cycloidal orbits can occur with too few facets. The modeling has shown that using 10 facets provides consistent orbits. The modeling has also been used to design the sole electrode slit and pusher electron configuration. The impact of the faceted cathode geometry upon magnetron dynamics has been investigated using $ICEPIC^{2},$ AFRL's 3D electromagnetic particle-in-cell code. ICEPIC calculations are also being used to explore aspects of controlled emission enabled by the use of FEAs. These simulation results will be presented.
Starting Page	1
Ending Page	1
File Size	133020
Page Count	1
File Format	PDF
ISBN	9781424454747
ISSN	07309244
e-ISBN	9781424454761
e-ISBN	9781424454754
DOI	10.1109/PLASMA.2010.5533895
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cathodes Geometry Electrodes Magnetic devices Anodes Electron emission Orbits Protection Magnetic shielding Fabrication
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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