PRODUCTION ENGINEERING MEASURE FOR TYPE 7890 SUPER POWER HYDROGEN THYRATRON.
Abstract
The tube design, tooling, and assembly methods followed produce a tube meeting the requirements of SCL-7001/59 dated 3 October 1960 and the added requirement that the cathode heater current be limited to 30 amperes, maximum. The principal mechanical problem encountered was the cracking of the metal in anode cups made according to the original design. The means used to by-pass the problem are not an ultimate solution. Grid emission tends to become the limiting factor in the operation of the tube. The emission was suppressed principally by providing means of cooling the grid. The reservoir and the cathode are adequate for present requirements. The tube would be improved by increasing the capacities of both reservoir and cathode. At rated operating conditions, the present limit on the tube's life is in cathode performance. The area of the emitter could be increased conveniently by 15 percent and still be effectively heated within the cathode heater current limitations of SCL-7001/59, dated 3 October 1960. Heating time would be relatively unaffected. The reservoir capacity could be doubled at no increase in heating power but only an increase in heating time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 15, 1965
- Accession Number
- AD0634151
Entities
People
- C. L. Shackelford