RESEARCH ON LOW NOISE CATHODE DEVELOPMENT.
Interim engineering rept. no. 4, 1 Feb-30 Apr 64,
RAYTHEON CO WALTHAM MASS
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The purpose of this program is to achieve thermionic or non-thermionic emission with a low noise temperature. A vehicle for measuring the effective noise temperature of cathodes has been tested. The method for changing cathodes appears to be satisfactory. A calibration has been obtained for the Dicke radiometer. A computer program has been formulated to assist in designing electron guns for use with narrow velocity-spread cathodes. This has been applied to two types of cathodes which have been suggested. Experiments have been conducted on cooled S-4 photocathodes. A tube has been designed that permits forming photosurfaces on surfaces that can be cooled to very low temperatures. Some preliminary tubes of this sort have been fabricated. A theoretical treatment of the velocity and the density distribution in a simple model of a low noise gun is being carried out with the help of a computer. Author