LONG-LIFE COLD CATHODE STUDIES FOR CROSSED-FIELD TUBES
Quarterly rept. no. 6, 15 Jan-15 Apr 1967
RAYTHEON CO WALTHAM MA MICROWAVE AND POWER TUBE DIV
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A polished beryllium target was evaluated in the Electron Bombardment Vehicle EBV for 38 hours. Delta was observed as a function of electron bombardment level up to 0.5 ampssq. cm, sense of electric field in front of target, and partial pressure of oxygen. An aluminum target Alloy 6061 was similarly evaluated in the EBV for 92 hours. The possibility of stabilizing delta max of either target at values of 3 to 4 through the use of oxygen pressures of 5 x 10 to the minus 6th power to 1 x 10 to the minus 5th power torr in the presence of electron bombardment at 0.5 ampssq. cm was indicated by the results. A barium-calcium-aluminate impregnated tungsten emitter was operated at full power in the QKS1194 test vehicle prior to thermal activation. An aluminum cold cathode was evaluated in the high-stress level CFA test vehicle QKS1397. Operation at 0.001 duty cycle and approximately 3 ampssq. cm electron bombardment was stabilized using oxygen pressures in the range 10 to the minus 6th power to 10 to the minus 5th power torr.
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