LONG-LIFE COLD CATHODE STUDIES FOR CROSSED-FIELD TUBES
Quarterly rept. no. 5, 15 Oct 1966-15 Jan 1967
RAYTHEON CO WALTHAM MA MICROWAVE AND POWER TUBE DIV
Pagination or Media Count:
Reduction was observed in deltamax 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 deltamax of 1.7 to 2.0 which did not deteriorate under electron bombardment at 0.5 Asq cm and 1.2 kv for 8 hours. A 98 beryllium sample was evaluated in the EBV. Deltamax was approximately 4.0 and did not deteriorate during 80 hours of electron bombardment at 0.5 Asq cm and 1.2 kv. Indication of delta increases due to O bombardment was observed. The hotcold 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.
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