Travelling wave tube with periodic-permanent magnet focusing sys

Details Travelling wave tube with periodic-permanent magnet focusing sys Travelling wave tube with periodic-permanent magnet focusing sys

1981-04-13

1983-09-13

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

315 535, 315 36, H01J 2534

Patent

active

044044941

ABSTRACT:
Travelling wave tube, including a cylindrical vacuum shell having an outer diameter, a permanent magnet system surrounding the cylindrical vacuum shell including ring-shaped pole shoes having inner and outer diameters, magnet rings having inner and outer diameters and forming pairs with the pole shoes, each of the magnet rings being alternatingly disposed between two pole shoes in axial direction and being poled in opposite sense with respect to the next magnet ring, the inner diameters of the pole shoes being closely fitted around the vacuum shell and being smaller than the inner diameters of the magnet rings, the outer diameters of the magnet ring being larger than the outer diameters of the pole shoes, and a centering and retaining ring being adjacent to and in contact with each of the pole shoe and magnet ring pairs for centralizing the inner diameters of the pole shoes to the outer diameters of the magnet rings and for centralizing the inner diameters of the pole shoes and the outer diameters of the magnet rings to the outer diameter of the vacuum shell.

REFERENCES:
patent: 2843775 (1958-07-01), Yasuda
patent: 2965782 (1960-12-01), Weaver
patent: 3188533 (1965-06-01), Bretting et al.
patent: 3401295 (1968-09-01), Suzuki

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