Abstract
RECENT publications1 have indicated that internally coated cathodes would be useful as sources of annular, high current-density electron beams in millimetre wave-length klystrons. For this application their behaviour in magnetic confining fields and their life are important. To study these factors, the cathode shown in Fig. 1 was used; in the first set of experiments, cathodes were made from ‘O’ nickel and coated with a standard triple-carbonate mixture. Cathode temperatures were measured with 0.005 in. diameter platinum–platinum 13 per cent rhodium thermocouples.
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