X-BAND HIGH POWER CW AMPLIFIER AND AMPLIFIER CONSOLE.
Abstract
Efforts to develop a 12.5 kw CW traveling-wave tube covering the frequency range from 7.7 to 8.4 Gc are described. The tube is designed for use in SATCOM ground stations. Detailed discussions of accomplishments are described. Major effort was to obtain a tube that would operate CW with full rf power and efficiency. Tube 29, tested under pulse conditions during the previous quarter, showed all the desired characteristics of power, efficiency and collector depression. CW tests, performed on this tube at the beginning of this quarter, verified satisfactory power output and efficiency; however, problems were encountered when operating with depressed collector. This problem was traced to ion focusing of the beam in the collector caused by the accumulation of gas when the tube was operated with the collector depressed. A proposed solution to this problem was to install an electrode an electrode in the end of the collector to operate at a negative potential, and thus attract and neutralize ions in the collector region. A diode was built with such an electrode in the collector to test both the theory of ion focusing and the ability of a negative electrode to neutralize the positive ions. Although it was found necessary to vary the electrode design, the final results were successful. The final design is actually a pump made of a titanium-tipped electrode in the end of the collector, operated at cathode potential. The last diode built operated well over one hour at full voltage, and full collector depression, without failure. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1965
- Accession Number
- AD0474084
Entities
People
- Norman H. Pond
- Robert E. Eggers