RESEARCH AND DEVELOPMENT PROGRAM FOR X-BAND CROSSED-FIELD AMPLIFIER
Abstract
At the end of the first year's work it was demonstrated that an X- band line can be made by photo-forming on the surface of an insulator. The fenced line (a dissymmetric multiple meander with edges closed) was found to have many advantages, but (1) the r-f fields were concentrated at the center, (2) dispersion was excessive for the broad band required here, and (3) transmission losses were too high. A multiple meander open at the edges is therefore to be used in further studies. A saphire support was chosen for the line; the principal disadvantage of ceramics was surface roughness. Work with beryllia ceramics is continuing because the thermal conductivity is important. Studies on other parts of the tube design have been undertaken: (1) support of the delay line in a niobium frame; (2) a stepped ridge to couple the delay line to the waveguide and avoidance of coupling to possible fast wave in the interaction space; (3) a high current density gun with a grid and other design features to reduce excess noise, and with a shield to keep r-f energy out of the cathode region.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 12, 1964
- Accession Number
- AD0608849