Periodic permanent magnet focusing system for electron beam

Details Periodic permanent magnet focusing system for electron beam Periodic permanent magnet focusing system for electron beam

1993-04-02

1998-04-28

Lee, Benny T.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

335210, 335306, H01J 23087

Patent

active

057449104

ABSTRACT:
A focusing system for a helix TWT includes a polepiece structure for conducting magnetic flux to a drift tube of the TWT in a first general direction and conducting the magnetic flux from the drift tube in a second general direction perpendicular to the first general direction. Radially magnetized permanent magnets are disposed at outer portions of the polepiece structure and supply the magnetic flux. A first pair of the magnets have a first direction of polarity, and a second pair of the magnets have a second direction of polarity opposite to the first direction. An outer shell encapsulates the polepiece structure and the magnets, and provides a magnetic flux return path. An electron beam travels in the drift tube and the magnetic flux provides focusing for the electron beam.

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patent: 4800322 (1989-01-01), Symons
patent: 4931694 (1990-06-01), Symons et al.
patent: 4931695 (1990-06-01), Symons

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