Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1991-04-24
1992-06-09
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
315 539, 328227, H01J 2306, H01J 2315
Patent
active
051210312
ABSTRACT:
A microwave electron gun for a linear accelerator uses microwave energy to impart an initial acceleration to electrons emitted from a lanthanum-hexaboride cathode. The microwaves are contained in an electron-gun cavity, the upstream wall of which has a protruding part surrounding the entrance opening that accommodates the cathode, and the downstream wall of which has a flat part surrounding an exit opening. The rest of the downstream wall has a radius of curvature equal to that of the other microwave cavities in the accelerating tube, and its center of curvature is aligned with theirs. The cathode is fused to a pair of carbon electrodes to form a cathode block, which is held by clamping between a pair of electrode bars, thus forming a cathode tube. The cathode tube is inserted into a sleeve upstream of the entrance opening in the electron-gun cavity, and is surrounded at a distance of one quarter-wavelength from the cathode by a disk-shaped choke cavity extending one quarter-wavelength from the cathode tube. This electron gun is easy design and operate, and prevents loss of microwave energy.
REFERENCES:
patent: 3558967 (1971-01-01), Miriam
patent: 4286192 (1981-08-01), Tanabe et al.
patent: 4629938 (1986-12-01), Whitham
patent: 4746839 (1988-05-01), Kazusa et al.
patent: 4988919 (1991-01-01), Tanabe et al.
LaRoche Eugene R.
Mitsubishi Denki & Kabushiki Kaisha
Yoo Do Hyum
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