IL42696A - Periodic magnetically focused beam tube - Google Patents

Claims (2)

1. 42696/2 CLAIMS. 1. In a magnetically focused beam tube, an evacuable envelope structure, means within said envelope for forming and projecting a^sheet-shaped beam of charge particles over a predetermined beam path, electrical circuit means disposed along the beam path in electromagnetic wave energy exchanging relation with the beam of charged particles, periodic magnetic focus mean disposed along the beam path for producing a periodic magnetic, field within the beam path for focusing the beam along a predetermined beam path, said periodic magnetic focus means homogeneous including a slab of/material having a planar face facing said beam, said material being permanently magnetized in a pattern of periodic permanent poles of alternating polarity in a direction along the beam path.

2. The apparatus of Claim 1 wherein said periodic magneti focus means includes a pair of said slabs disposed on opposite sides of said sheet-shaped beam. 3· The apparatus of Claim 1 wherein the period of said pattern of permanent magnetic poles changes in a direction taken along the beam path. . The apparatus of Claim 1 wherein s aid magnet slab is a slab of ferrite magnet material. 5# The apparatus of Claim 1 wherein said magnet slab is a slab of permanently magnetizable magnet particles embedded in a binder material. i 42696/2 6. i e apparatus of Claim 5 wherein said binder material is flexible such that said slab is flexible. 7. The apparatus of Claim 1 including, a dielectric slab having major and mino faces with a major face disposed facing a major face of said sheet-shaped beam, and wherein said magnetizable member includes a slab of substantially homogeneous permanently magnetizable material disposed overlaying said dielectric slab, and said magnetic slab member having major and minor faces, and a major face of said magnetic member bein disposed facing a major face of said dielectric slab. 8. The apparatus of Claim 7 wherein said permanently magnetizable structure includes a pair of said magnetizable slabs disposed on opposite sides of said sheet-shaped beam with thei respective m or faces disposed facing a corresponding major fac« of said sheet-shaped beam. 9. She apparatus o Claim 7 wherein said electrical circui is a microwave interaction structure formed on said major face of said dielectric slab which faces the corresponding major face of said sheet-shaped beam. 10. The apparatus of Claim 9 including electrostatic edge focusing electrode means disposed adjacent the edge regions of said slow wave circuit in electrical insulative relatio thereto and extending along the opposite edges of said sheet-shaped beam for constraining lateral expansion of said sheet-shaped beam. 11. She apparatus of Claim 10 wherein said edge focusing electrode means is disposed on said major face of said dielectric slab which faces said major face of said beam. 42696/2 12· The apparatus of Claim 11 wherein the beam of charged particles is a beam of electrons, and wherein said beam forming and projecting means includes a thermionic cathode emitter means disposed at the upstream end of said beam path for generating the beam of electrons, current carrying lead means for supplying heater current to said thermionic cathode emitter, and wherein said dielectric slab has an even major face facing said correspondin major face of said electron beams, and therein said slow nav circuit, edge focusing electrode means, and said heater lead means are all ormed directl on and li substantially entirely on said even major face of said dielectric slab which faces said sheet-shaped electron beam. 13· The apparatus of Claim 12 wherein said even major face of said dielectric slab ie planar. 14· Te apparatus of Claim 13 including beam collector electrode means disposed on and lying substantially entirely on said planar majo face of said dielectric slab at th terminal end of said beam path. 15 Che apparatus of Claim 1 including, beam focus electrode structure disposed on and lying substantially entirely on said planar major face of said dielectric slab at the upstream end of said beam path intermediate said cathode emitter means and said slow wave circuit means. 6. fe apparatus of Claim 9 wherein sai electrical circuit means includes a pair of elongated microwave intex&efcion structure means disposed on said major face of said dielectric slab in end-to-end relation, and wherein said beam forming and projecting means includes a thermionic cathode emitter disposed 42696/2 intermediate the adjacent ends of said pair of microwave interaction structure means for projecting a pair of electron beams in opposite direction along said pair of microwave interaction structure means. 17. $h© apparatus of Claim 9 wherein said electrical circuit means Includes a plurality of elongated microwave interaction structure means disposed on and lying substantially entirely on said major face of said dielectric slab in side-by-side relation. For the Applicants BB. EEIKHOLD COT JUS© PARTHESS By: