LOW NOISE 26-40 GC TWT DEVELOPMENT.
Abstract
The report covers the work of the first 6 months of a 15 month program for the development of Ka-band (26 to 40 Gc), low noise traveling wave tube amplifier. The initial tube design and construction techniques are reviewed under the headings helix, low noise gun, overall tube design, and mechanical design of tube, jigs, and fixtures. From study of the many factors involved, the initial helix design analysis was based on a gamma at 40 Gc of 2.9, a cathode to helix diameter of 0.5, and a beam of 400 a. Helix calculations at 2000 v, 2500 v, and 3000 v, indicated that a two section helix at approximately 2000 v input and 3000 v output is best for this Ka-band tube. The low noise gun considerations are based on the two important gun regions: the low noise diode region and the noise wave transformer region. Due to the small cathode diameter imposed by the high frequency, a cathode with side coating, which will increase the emitting area over that obtained with a parallel flow gun, is discussed. Mechanical design and assembly jig and fixture techniques, which are extremely important to the successful development of a Ka-band tube, were evaluated, and it was determined that the gun stack alignment to the helix ID and the cathode alignment to the gun stack are the most critical construction areas.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1965
- Accession Number
- AD0626383
Entities
People
- W. E. Raub
Organizations
- General Electric