Claims
- 1. A multiple beam RF device, said device comprising:a magnetic field enclosure having a central axis, a cylindrical body oriented along said central axis, a cathode end, and a collector end; a solenoidal field generator located within said magnetic field enclosure and generating a field substantially aligned with said central axis; said magnetic field enclosure cathode end and said magnetic field enclosure collector end each having n apertures; an RF circuit having a plurality said n of beam tunnels, each said beam tunnel having a beam tunnel axis, each said beam tunnel including drift tubes and gaps, said beam tunnel extending from said cathode end aperture to said collector end aperture, said cathode end aperture forming an anode; a plurality n of thermionic cathodes; a plurality said n of collectors; a magnetic field corrector external to said magnetic field enclosure and enclosing each said cathode.
- 2. The RF device of claim 1 where said RF circuit includes at least 3 gaps.
- 3. The RF device of claim 2 where said RF circuit includes a first gap proximal to said cathode end.
- 4. The RF device of claim 3 where said first gap includes an RF input port.
- 5. The RF device of claim 3 where said first gap is common to all said beam tunnels.
- 6. The RF device of claim 3 where said first gap forms a resonant chamber at a given RF frequency.
- 7. The RF device of claim 3 where a second gap is positioned between said first gap and said collector end.
- 8. The RF device of claim 7 where said second gap includes an RF input port.
- 9. The RF device of claim 7 where said second gap is common to all said beam tunnels.
- 10. The RF device of claim 7 where said second gap forms a resonant chamber at said given RF frequency.
- 11. The RF device of claim 7 where each said beam tunnel includes said second gap forming a cavity, said second gaps not sharing said cavity.
- 12. The RF device of claim 7 where said second gap forms a resonant cavity at said given RF frequency.
- 13. The RF device of claim 7 where a third gap is positioned between said second gap and said collector end.
- 14. The RF device of claim 13 where said third gap includes an RF output port.
- 15. The RF device of claim 13 where said third gap is common to all said beam tunnels.
- 16. The RF device of claim 15 where said third gap forms a resonant chamber at said given RF frequency.
- 17. The RF device of claim 1 where said anode is adjacent to said cathode, and a voltage is applied between said anode and said cathode.
- 18. The RF device of claim 17 where said anode of said RF circuit is common to all said cathodes.
- 19. The RF device of claim 17 where said anode end of said RF circuit is separately formed for each said cathode.
- 20. The RF device of claim 1 where said RF circuit is formed from copper.
- 21. The RF device of claim 1 where said magnetic field corrector is circularly symmetric with respect to said central axis.
- 22. The RF device of claim 1 where said magnetic field corrector is formed by a solid of rotation, said solid of rotation formed from a locus of points rotated about said central axis.
- 23. The RF device of claim 1 where said magnetic field corrector is formed such that flux leaving said magnetic field enclosure cathode end impinges on said cathode perpendicular to the surface of said cathode.
- 24. The RF device of claim 1 where said magnetic field corrector includes an aperture for each cathode, and said magnetic field corrector is formed from the solid of rotation from rotating a locus of points about a central axis, said locus of points described by:a first arc segment having a center located on a point planar to said magnetic field enclosure cathode end and at the center of said cathode aperture, said arc starting on said plane of said magnetic field enclosure and ending on said magnetic field correction aperture, a second arc segment having a center located on a point within a first distance of an edge of said cathode, said first distance less than half the diameter of said cathode, said arc segment starting on said plane of said magnetic field enclosure and ending on said magnetic field correction aperture.
- 25. The RF device of claim 24 where said magnetic field corrector includes a plurality of apertures, one for each said electron gun.
- 26. The RF device of claim 1 where each said electron gun is centered in each said beam tunnel such that the axis of each said cathode of each said electron gun and the axis of each said beam tunnel are coincident.
- 27. The RF device of claim 24 where the magnetic field apertures are rotated an angle 21 azimuthally about said central axis, said rotation compensating for any helical trajectory of an electron beam which starts at each said cathode and ends at each said collector.
- 28. A magnetic circuit for the guiding of a plurality n of parallel electron beams into a plurality n of electron beam tunnels, said magnetic circuit comprising:a cylindrical magnetic enclosure having a central axis, said enclosure including a cathode end cap and a collector end cap, said magnetic enclosure substantially surrounding said plurality n of electron beam tunnels; a plurality of electron guns, each said electron gun having a thermionic heater coupled to a cathode having a surface emitting electrons, each said cathode emitting surface positioned proximal to said cathode end cap of said electron beam tunnel, said end cap including an aperture for furnishing electrons into said beam tunnel; an RF circuit surrounding said beam tunnels; a magnetic field generator located inside said cylindrical magnetic enclosure for producing a magnetic field parallel to said central axis; a magnetic field corrector for modifying said magnetic field produced by said magnetic field generator such that said magnetic field is perpendicular to each said cathode electron emitting surface.
- 29. The magnetic circuit of claim 28 where said magnetic field corrector includes an electromagnetic coil wound around each said cathode and producing a correcting magnetic field.
- 30. The magnetic circuit of claim 28 where said magnetic field corrector includes a plurality of voids in said cathode end cap.
- 31. The magnetic circuit of claim 28 where said magnetic field corrector includes a plurality of apertures in said cathode end cap, each said aperture for each said beam tunnel including a first aperture centered on said beam tunnel and a crescent aperture formed by a first circle concentric to said first aperture and a second circle of larger diameter than said first circle, said second circle tangent to said first circle on a point on a line between said first aperture center and said central axis.
- 32. The magnetic circuit of claim 28 where said magnetic field corrector includes an electromagnetic coil concentric to said central axis and outside the extent of said cathodes.
- 33. The magnetic circuit of claim 28 where said magnetic field corrector includes a permanent magnet concentric to said central axis and outside the extent of said cathodes.
- 34. The magnetic circuit of claim 28 where said magnetic field corrector includes an electromagnetic coil concentric to said central axis.
- 35. The magnetic circuit of claim 28 where said magnetic field corrector includes an iron post concentric to said central axis and an iron disk concentric to said central axis attached to said iron post.
- 36. The magnetic circuit of claim 28 where said magnetic field corrector includes a solid of rotation which encloses said cathodes.
- 37. The magnetic field circuit of claim 28 where said magnetic field corrector includes a solid of rotation formed by sweeping a locus of points about said central axis, said locus of points formed by a first arc having a center in front of said cathode, and a second arc having a center a first distance from the outside edge of same said cathode, said first distance less than half the diameter of said cathode.
- 38. The magnetic circuit of claim 28 where said RF circuit includes a traveling wave electric circuit.
- 39. The magnetic circuit of claim 38 where said traveling wave electric circuit is common to at least two said beam tunnels.
- 40. The magnetic circuit of claim 38 where said traveling wave electric circuit is not common to any said beam tunnels.
- 41. The magnetic circuit of claim 28 where said RF circuit includes a resonant RF circuit.
- 42. The magnetic circuit of claim 41 where said resonant RF circuit includes a common input port and a common output port.
- 43. The magnetic circuit of claim 42 where said resonant RF circuit includes at least one common resonant cavity between said input port and said output port.
- 44. The magnetic circuit of claim 42 where said resonant RF circuit includes no common resonant cavity between said input port and said output port.
- 45. The magnetic circuit of claim 41 where said resonant RF circuit is a klystron.
Parent Case Info
This application is a continuation-in-part of pending application Ser. No. 09/629,364 filed on Aug. 1, 2000.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO 9738436 |
Oct 1997 |
WO |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/629364 |
Aug 2000 |
US |
Child |
10/128215 |
|
US |