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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References
Mueller, G. E., Trans. Inst. Rad. Eng. (Electron Devices), 4, 33 (1953). Kumpfer, B. D., and Brett, H., Convention Record Inst. Rad. Eng., Pt. 3, 66 (1954).
Hawkins, P. O., Nature, 174, 1177 (1954). Bright, A. W., and Thorp, J. S., Nature, 176, 1079 (1955).
Thorp, J. S., Brit. J. App. Phys., 6, 366 (1955).
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HAWKINS, P., THORP, J. Internally Coated Cathodes. Nature 178, 380–381 (1956). https://doi.org/10.1038/178380a0
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DOI: https://doi.org/10.1038/178380a0
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