Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1989-07-26
1991-07-02
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
050292595
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 to design and operate, and prevents loss of microwave energy.
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"Microwave Electron Gun," G. A. Westenkow and J. M. J. Madey, in Laser and Particle Beams, vol. 2, Part 2, pp. 223-225, 1984.
LaRoche Eugene R.
Mitsubishi Denki & Kabushiki Kaisha
Yoo Do Hyun
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