DEVELOPMENT OF S-BAND LOW-NOISE PERIODIC PERMANENT MAGNET TRAVELING-WAVE TUBE
Abstract
An additional focusing test using two ferrite stacks opposed so as to yield a reversed-field was made. Performance was only moderate, with 75 percent beam transmission being obtained at rated helix voltage. A very promising magnetic circuit configuration using a straight-field Alnico 5 magnet has been devised. The external fringing field is effectively shielded and the cathode field is peaked to about 750 gauss. Two tubes have been built with stepped- diameter gun bulbs, permitting the use of a gun stack with less than 1/2-inch diameter. One of these operated with a best noise figure of 3.1 db. A half- inch pin base has been developed, in addition to a coupler with 3/4-inch diameter. These size reductions permit the use of a small, lightweight magnet.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 20, 1962
- Accession Number
- AD0296410
Entities
People
- B.p. Israelsen
Organizations
- Watkins-Johnson Company