GB772091A - Improvements in or relating to electron tube arrangements consisting of a travelling-wave tube and a magnetic focusing system - Google Patents
Improvements in or relating to electron tube arrangements consisting of a travelling-wave tube and a magnetic focusing systemInfo
- Publication number
- GB772091A GB772091A GB2666554A GB2666554A GB772091A GB 772091 A GB772091 A GB 772091A GB 2666554 A GB2666554 A GB 2666554A GB 2666554 A GB2666554 A GB 2666554A GB 772091 A GB772091 A GB 772091A
- Authority
- GB
- United Kingdom
- Prior art keywords
- soft iron
- tube
- magnetic
- bars
- permanent magnets
- 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
-
- 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
Landscapes
- Particle Accelerators (AREA)
- Microwave Tubes (AREA)
Abstract
772,091. Magnets. SIEMENS & HALSKE AKT.-GES. Sept. 14, 1954 [Nov. 13. 1953], No. 26665/54. Class 35. [Also in Group XL (a)] A travelling wave tube has a magnetic focusing device comprising a plurality of closed ferromagnetic circuits with a common flux guide of soft iron, each circuit having at least one permanent bar magnet, the magnetic circuits being completed by soft iron members, the magnetic fields all being in the same direction and producing an axial magnetic field in the tube for focusing at least one electron stream as a parallel sided beam throughout the length of the flux guide. The beam may be cylindrical or annular and there may be one beam or two beams travelling in the same direction or in opposite directions. In one embodiment, Fig. 1 (not shown), four permanent magnets are spaced around a soft iron tube, soft iron end plates completing the magnetic circuit. The magnet system can support the discharge tube, and the tube leads, especially high-frequency leads, can be secured to the magnet system directly or indirectly. If the magnetic field is not to reverse at the end, a soft iron collar can be secured to one of the end plates, Fig. 3 (not shown.). Alternatively, if field reversal over a short length is desired, a magnetic screen (such as 39, Fig. 9) is provided adjacent one of the soft iron end plates but has opposite polarity with respect thereto, Fig. 4 (not shown). The arrangements of Figs. 3, 4 can be applied at both ends of the magnet assembly. In another form, Fig. 5A, two sets of four permanent magnets 10-13, 14-17 are secured to the flat outer faces of the thickened ends of a soft iron tube 7 and the magnetic circuit is completed by four soft iron bars 18- 21. In another form, Fig. 6, there are four sets of radially extending permanent magnets 10, 12; 14, 16; 26, 28; 27, 29 (only two of each set of four shown) connected by bars 22, 24; 23, 25; 30, 31. Members 30, 31 are preferably replaced by a soft iron tube. Alternatively, there may be a permanent magnet between each pair of connecting bars 22, 24; 23, 25 instead of permanent magnets 26, 27, 28, 29 and members 30, 31. In one such form, Fig. 7 (not shown), tube 7 is in two parts of different diameters, the part of larger diameter being so thick that there is no field. inside it so that it can house the gun of a travelling wave tube. This part also has apertures for hollow tubular high-frequency conductors. In another form, Fig. 9, there are six sets of four permanent magnets 10, 12, 14, 16; 43,47; 44,48; 45, 49; 46, 50; 14, 16, soft iron bars 33, 34, 35, 36 and soft iron cylinders 37, 38. Screen 39 can be moved axially by sliding members 40 to adjust the strength of the negative field. The soft iron tube 7 is divided into two concentric tubes 41, 42. Instead of four external magnetic paths there can be two or more than four. The beam may be made to diverge as it approaches the collector by means similar to that of Fig. 7 for the gun end. Alternatively, the magnet system may terminate at the output end of the delay line so that the beam after emerging from the magnet system is focused to a lesser extent in the region of opposite field and then diverges to the collector. The soft iron tube 7 may be made up of a number of elements, e.g. bars. The cross-section or permeability of plates is greater than that of tube 7.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES36313A DE1098625B (en) | 1953-11-13 | 1953-11-13 | Magnetic bundling system for bundled guidance of one (several) electron flow (s) by means of a homogeneous magnetic field along a larger distance, especially for traveling wave tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB772091A true GB772091A (en) | 1957-04-10 |
Family
ID=7482170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2666554A Expired GB772091A (en) | 1953-11-13 | 1954-09-14 | Improvements in or relating to electron tube arrangements consisting of a travelling-wave tube and a magnetic focusing system |
Country Status (4)
Country | Link |
---|---|
CH (1) | CH328248A (en) |
DE (1) | DE1098625B (en) |
FR (1) | FR1108490A (en) |
GB (1) | GB772091A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2944182A (en) * | 1958-11-13 | 1960-07-05 | Bell Telephone Labor Inc | Beam focusing system |
DE1112790B (en) * | 1957-07-11 | 1961-08-17 | Philips Nv | Permanent magnetic focusing system for generating an at least approximately homogeneous magnetic field for the bundled guidance of the electron beam of a traveling field tube |
US3379920A (en) * | 1964-10-14 | 1968-04-23 | Westinghouse Electric Corp | Traveling-wave tube with efficiencyenhancing focus-field jump |
EP0724281A2 (en) * | 1995-01-28 | 1996-07-31 | Samsung Electronics Co., Ltd. | Klystron |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4691169A (en) * | 1979-03-15 | 1987-09-01 | Baum Robert A | Electrode assembly especially adapted to utilizing a magnetic field for measuring electric conductivity of treated non-polar liquids |
US4387323A (en) * | 1980-12-15 | 1983-06-07 | Varian Associates, Inc. | Permanent magnet structure for linear-beam electron tubes |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB515308A (en) * | 1938-05-25 | 1939-12-01 | Miller Harold | Improvements in or relating to magnetic electron lenses |
BE516533A (en) * | 1951-12-29 |
-
1953
- 1953-11-13 DE DES36313A patent/DE1098625B/en active Pending
-
1954
- 1954-09-09 CH CH328248D patent/CH328248A/en unknown
- 1954-09-14 GB GB2666554A patent/GB772091A/en not_active Expired
- 1954-09-21 FR FR1108490D patent/FR1108490A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1112790B (en) * | 1957-07-11 | 1961-08-17 | Philips Nv | Permanent magnetic focusing system for generating an at least approximately homogeneous magnetic field for the bundled guidance of the electron beam of a traveling field tube |
US2944182A (en) * | 1958-11-13 | 1960-07-05 | Bell Telephone Labor Inc | Beam focusing system |
US3379920A (en) * | 1964-10-14 | 1968-04-23 | Westinghouse Electric Corp | Traveling-wave tube with efficiencyenhancing focus-field jump |
EP0724281A2 (en) * | 1995-01-28 | 1996-07-31 | Samsung Electronics Co., Ltd. | Klystron |
EP0724281A3 (en) * | 1995-01-28 | 1998-09-02 | Samsung Electronics Co., Ltd. | Klystron |
Also Published As
Publication number | Publication date |
---|---|
CH328248A (en) | 1958-02-28 |
FR1108490A (en) | 1956-01-13 |
DE1098625B (en) | 1961-02-02 |
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