LONG-LIFE COLD CATHODE STUDIES FOR CROSSED-FIELD TUBES
Abstract
Reduction was observed in delta(max) from 2.3 to 1.4, typically, for sputtered region compared to unsputtered region of electron beam evaporated A12O3 films on Mo substrate. Two 200 A CVD-prepared BN films on Mo substrate were evaluated in the Electron Bombardment Vehicle (EBV) and had a delta(max) of 1.7 to 2.0 which did not deteriorate under electron bombardment at 0.5 A/sq cm and 1.2 kv for 8 hours. A 98 + % beryllium sample was evaluated in the EBV. Delta(max) was approximately 4.0 and did not deteriorate during 80 hours of electron bombardment at 0.5 A/sq cm and 1.2 kv. Indication of delta increases due to O(+) bombardment was observed. The hot/cold EBV has been modified and recalibrated. The QKS1194 crossed-field test vehicle, containing a barium- calcium-aluminate impregnated tungsten cathode, has been completed and is ready for test. A brief summary of cold cathode materials evaluation work performed to date under this contract is included.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1967
- Accession Number
- AD0813014
Entities
People
- C. R. Mcgeoch
- L. Lesensky
Organizations
- RTX