Open-circuit magnet structure for cross-field tubes and the like

Details Open-circuit magnet structure for cross-field tubes and the like Open-circuit magnet structure for cross-field tubes and the like

1978-01-19

1980-02-05

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Distributed parameter resonator-type magnetron

315 3951, 315 3975, 335302, 335306, H01J 2550

Patent

active

041874447

ABSTRACT:
A magnetic circuit useful in crossed field tubes and the like. At least one permanent magnet assembly is provided which includes a high flux density magnet (as Alnico), a high coercive force magnet (as Samarium Cobalt) with an end area larger than the facing end of the high flux density magnet, and polarized oppositely thereto, and an iron transition member sandwiched between the two magnets. This isolates the high coercive force magnet and concentrates its flux. When used with a second such magnet assembly to create a high magnetic flux density in a gap therebetween, for example, in the interaction space of a crossed field tube, a higher flux density is achieved in the gap than would be the case utilizing the high flux density magnet alone within the available dimensional limitations. This is particularly so in an open magnetic circuit application having only a non-magnetic flux return path.

REFERENCES:
patent: 3253194 (1966-05-01), Parker
patent: 3454825 (1969-07-01), Curtis
patent: 3593239 (1971-07-01), Hofman
patent: 3855498 (1974-12-01), MacMaster et al.
patent: 3984725 (1976-10-01), Cook et al.
patent: 4048542 (1977-09-01), Miura

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