SHAPED-FIELD HOLLOW-BEAM ELECTRON GUN.
Final technical rept., 1 Apr 62-31 March 63,
SPERRY GYROSCOPE CO GREAT NECK NY
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A new concept for hollow-beam guns was developed, promoting greater potentialities than existed previously. For a beam of given dimensionS AND PERVEANCE, A MUCH LARGER CATHODE SURFACE IS ACHIEVED USING A FLARED CATHODE AND FLARED MAGNETIC-FIELD LINES. The magnetic lines then serve to converge the electron trajectories from the large cathode surface to the relatively small beam area. The flared shapes of the cathode and anode also provide a strong axial component of electric field. The electron transit time is thus minimized, and the noise properties are approximately the same as for solid beams. Previous hollow-bema guns were excessively noisy. Author