GB790017A - Improvements in or relating to travelling wave tubes - Google Patents
Improvements in or relating to travelling wave tubesInfo
- Publication number
- GB790017A GB790017A GB28632/55A GB2863255A GB790017A GB 790017 A GB790017 A GB 790017A GB 28632/55 A GB28632/55 A GB 28632/55A GB 2863255 A GB2863255 A GB 2863255A GB 790017 A GB790017 A GB 790017A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnets
- waveguide
- tube
- wave
- ferrox
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
- H01J23/087—Magnetic focusing arrangements
- H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing
Abstract
790,017. Travelling wave tubes. WESTERN ELECTRIC CO., Inc. Oct. 7, 1955 [Oct. 22, 1954], No. 28632/55. Class 39(1). [Also in Group XL(b)] A travelling wave tube has a waveguide feeder and a permanent magnet of ferrite within the waveguide feeder arranged to focus the beam over the region of the feeder. The device uses periodic magnetic focusing successive annular permanent ferrox-dure magnets being oppositely poled and being separated by high Á, e.g., permalloy discs which act as pole pieces to concentrate the magnetic field and make it uniform in each field region ; the spacing between the discs is uniform along the length of the tube. Ferrox-dure magnets 12, Fig. 2, are arranged within the feeder waveguides. Waveguide walls 15, 16 are also of high Á to act as polepieces and are coated with copper to minimize high frequency losses. Ferrite magnets 12 are in a position of electric field minimum to minimize wave reflections due to change in characteristic impedance of the guide produced by the magnets, i.e., away from the central axis of the waveguide. Ridge 24 concentrates the electric field in its vicinity, and both magnets 12 and ridge 24 are tapered to further reduce reflection. The effect of magnets 12 is to broaden the frequency band and thus offset the reduced size of the waveguide near the tube which leads to narrow the frequency band. Magnets 12 are relatively lossless, but have a high dielectric constant. Further annular permanent magnets are provided at the ends of the tube so that the periodic focusing magnetic structure extends substantially the entire length of the tube. The tube of Fig. 1 (not shown) is a forward wave amplifier but may be a backward wave amplifier or oscillator in which case it preferably has a ribbon helix. The helix pitch is increased at its ends for matching and ceramic spacers are provided between the input and output couplers on one hand and gun and collector on the other hand. In a modification, Fig. 3 (not shown) magnets 12 are tapered in a direction at right angles to the tapering of ridge 24. In another embodiment, Fig. 4, two rows of ferrox-dure magnets 12, preferably tapered, are positioned inside the waveguide feeder 6 in the vicinity of the travelling wave tube, adjacent ferrite magnets 12 being oppositely poled. Members 41, 15, 16 serve as polepieces. In another embodiment, Fig. 5, the high dielectric constant of the ferrox-dure is utilized by making the low frequency cut-off wavelength of the tapered waveguide portion equal to that for the wider portion 51. All the waveguide walls taper outwardly, and the ferrox-dure magnet 53 is tapered to keep the low frequency cut-off wavelength constant and to minimize reflections. Pole pieces 55, 56 are provided. Resistance material 57 is provided along one side of waveguide 51 and the travelling wave tube is arranged on the side of the waveguide axis away from 57 so that the non-reciprocal properties of the ferrite 53 can be utilized ; the path along one side of the guide axis is of low impedance for a circularly polarized wave travelling in one direction and along the other side a low impedance path is formed for a similar wave travelling in the other direction. Thus a wave travelling along the feeder towards the travelling wave tube has a low impedance on the side of the guide away from resistance 57 but the reflected wave passes along the side of the guide where the resistance material is and is attenuated. Other permanently magnetized ferrites can be used instead of ferrox-dure and the magnets outside the waveguides can be replaced by properly designed " metallic magnets." The ferroxdure used has the formula BaFe<SP>III</SP> 12 O 19 having a hexagonal crystal structure and one axis of lossy magnetization parallel to the hexagonal axis. Specifications 669,475 and 750,208 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US464052A US2812470A (en) | 1954-10-22 | 1954-10-22 | Periodic focusing in traveling wave tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB790017A true GB790017A (en) | 1958-01-29 |
Family
ID=23842348
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28632/55A Expired GB790017A (en) | 1954-10-22 | 1955-10-07 | Improvements in or relating to travelling wave tubes |
Country Status (4)
Country | Link |
---|---|
US (1) | US2812470A (en) |
DE (1) | DE1021959B (en) |
FR (1) | FR1132913A (en) |
GB (1) | GB790017A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113270304A (en) * | 2021-06-04 | 2021-08-17 | 深圳奥镨科技有限公司 | Multi-electron traveling wave tube with axisymmetric folded waveguide high-frequency slow-wave structure |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL200862A (en) * | 1954-10-04 | |||
US2919374A (en) * | 1955-07-05 | 1959-12-29 | Sylvania Electric Prod | Improved traveling wave tube amplifier |
US2964669A (en) * | 1955-08-25 | 1960-12-13 | Rca Corp | Traveling wave tube |
NL214979A (en) * | 1956-03-01 | |||
US2945154A (en) * | 1957-01-18 | 1960-07-12 | Sperry Rand Corp | Travelling wave tube |
US2939994A (en) * | 1957-01-28 | 1960-06-07 | Westinghouse Electric Corp | Electron discharge device |
US3007076A (en) * | 1957-05-03 | 1961-10-31 | Itt | Traveling wave electron discharge device |
US2966609A (en) * | 1957-11-22 | 1960-12-27 | Gen Electric | Magnetic structures for high frequency energy interchange apparatus |
NL104829C (en) * | 1958-02-25 | |||
US3027484A (en) * | 1958-03-29 | 1962-03-27 | Kobe Kogyo Kabushiki Kaisha | Periodic magnetic focussing system for travelling wave tubes |
NL98136C (en) * | 1958-06-27 | |||
US2970240A (en) * | 1958-10-01 | 1961-01-31 | Hughes Aircraft Co | Liquid-cooled traveling wave tube |
US2979636A (en) * | 1959-01-05 | 1961-04-11 | Magid Max | Wave guide-to-coaxial line coupling for traveling wave amplifiers |
US3001094A (en) * | 1959-01-14 | 1961-09-19 | Nippon Electric Co | Magnetic focusing device |
NL250375A (en) * | 1959-04-13 | |||
US3289031A (en) * | 1963-01-28 | 1966-11-29 | Varian Associates | High frequency electron discharge devices and slow wave structures therefor |
US3787747A (en) * | 1972-08-07 | 1974-01-22 | Varian Associates | Periodic magnetically focused beam tube |
FR2453497A1 (en) * | 1979-04-03 | 1980-10-31 | Thomson Csf | PERMANENT MAGNET FOCUSING DEVICE FOR ELECTRONIC TUBE, AND ELECTRONIC TUBE PROVIDED WITH SUCH A DEVICE |
DE3014404C2 (en) * | 1979-04-11 | 1985-04-18 | Nippon Electric Co., Ltd., Tokio/Tokyo | Lauffeldtube |
FR2485801A1 (en) * | 1980-06-27 | 1981-12-31 | Thomson Csf | Coupler for static focussed travelling wave tube - has rib connected to slow wave helix and guide of similar dimension to focussing magnet |
USH450H (en) | 1987-02-27 | 1988-03-01 | The United States Of America As Represented By The United States Department Of Energy | Magnetic field adjustment structure and method for a tapered wiggler |
US4942336A (en) * | 1988-04-18 | 1990-07-17 | Kurt Amboss | Traveling-wave tube with confined-flow periodic permanent magnet focusing |
-
1954
- 1954-10-22 US US464052A patent/US2812470A/en not_active Expired - Lifetime
-
1955
- 1955-06-07 FR FR1132913D patent/FR1132913A/en not_active Expired
- 1955-08-20 DE DEW17342A patent/DE1021959B/en active Pending
- 1955-10-07 GB GB28632/55A patent/GB790017A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113270304A (en) * | 2021-06-04 | 2021-08-17 | 深圳奥镨科技有限公司 | Multi-electron traveling wave tube with axisymmetric folded waveguide high-frequency slow-wave structure |
Also Published As
Publication number | Publication date |
---|---|
DE1021959B (en) | 1958-01-02 |
US2812470A (en) | 1957-11-05 |
FR1132913A (en) | 1957-03-19 |
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