NDLI: An ultrahigh precision electron gun-tube alignment technique for millimeter-wave applications

Content Provider	IEEE Xplore Digital Library
Author	Grant, T.J. Alvord, C.W.
Copyright Year	1985
Description	Author affiliation: Varian Associates, Palo Alto, CA (Grant, T.J.)
Abstract	This paper describes a simple technique to measure and adjust electron gun-circuit concentricity for millimeter-wave applications. Optimization of the electron gun design and magnetic focusing circuit is not sufficient to insure low circuit interception. High power, higher frequency millimeter wave tubes, some with circuit diameters less than 0.010 inch, must be precisely aligned from the cathode to the collector. A solution adopted by the authors is to use an inexpensive, low-power helium-neon laser to measure the concentricity of the cathode to the microwave circuit and correct by mechanical adjustment before final assembly. A laser beam is shot through a hole in the cathode, down the rf circuit, and picked up by a photodetector in the collector region. The technique is simple and can improve the gun-tube alignment by an order of magnitude.
Starting Page	196
Ending Page	198
File Size	221077
Page Count	3
File Format	PDF
DOI	10.1109/IEDM.1985.190928
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1985-12-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrons Millimeter wave technology Millimeter wave measurements Millimeter wave circuits Cathodes Magnetic circuits Masers Design optimization Frequency Microwave measurements
Content Type	Text
Resource Type	Article

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