GB726823A - Improvements in or relating to magnetic circuits for travelling wave apparatus - Google Patents
Improvements in or relating to magnetic circuits for travelling wave apparatusInfo
- Publication number
- GB726823A GB726823A GB31982/52A GB3198252A GB726823A GB 726823 A GB726823 A GB 726823A GB 31982/52 A GB31982/52 A GB 31982/52A GB 3198252 A GB3198252 A GB 3198252A GB 726823 A GB726823 A GB 726823A
- Authority
- GB
- United Kingdom
- Prior art keywords
- flux guide
- tube
- magnetic
- thickness
- polepieces
- 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
- Microwave Tubes (AREA)
- Particle Accelerators (AREA)
Abstract
726,823. Magnets. WESTERN ELECTRIC CO., Inc. Dec. 17, 1952 [Dec.29, 1951], No. 31982/52. Class 35. [Also in Group XL (a)] Travelling wave apparatus is provided with a magnetic circuit for focusing comprising a pair of polepieces energized by a magnet and defining an air gap in which the delay line is positioned, and a " flux guide " of magnetic material extending between the polepieces and effectively encompassing the air gap, the flux guide being of varying thickness so as to focus the beam in a desired manner. In one form, Fig. 1, a travelling wave tube 16 having heat radiator 20 is positioned within and supported by two U-shaped magnets 10, 11 with common cylindrical polepieces 12, 13. The gun 17 is surrounded by a magnetic shield within the tube and the assembly is positioned within polepiece 12. The tube construction may be as described in Specification 697,550, [Group XL (a)], in which the gun shield is outside the tube envelope. 23, 24 are input and output wave-guides and may assist in supporting the tube. The flux guide may be two magnetic (steel) plates 27; they are linearly tapered from each end to the centre and are wide compared to their separation and serve to make the flux lines straight and the field uniform as described with reference to Figs. 2, 3 (not shown). A cylindrical flux guide is theoretically better than two plates but has the disadvantages that (a) large apertures therein would be necessary for the input and output wave-guides or, (b) if coaxial terminals are employed for coupling the input and output the tube is not accessible for inspection. Impingement of the electrons on the helix near the collector, due to space charge radial debunching, is prevented by using a strong magnetic field; the field should, however, be weaker along most of the helix to allow the electrons to pass close to the helix where the interaction is most favourable. Thus the flux guide cylinder or plates may be thickest near the gun and thinnest near the collector, Figs. 5, 6 (not shown). The thickness variation may be exponential or linear. In another form, Fig. 7 (not shown), the form of Fig. 1 is modified by shaping the right hand half of the flux guide to deviate from the linear increase in thickness by an exponentially increasing amount so that the field increases exponentially from the midpoint to the collector. Permanent or electromagnets may be used. The variation in thickness of the flux guide may be modified for example in devices where small signal theory does not hold.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US264096A US2807743A (en) | 1951-12-29 | 1951-12-29 | Traveling wave tube apparatus including magnetic structures |
Publications (1)
Publication Number | Publication Date |
---|---|
GB726823A true GB726823A (en) | 1955-03-23 |
Family
ID=23004557
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31982/52A Expired GB726823A (en) | 1951-12-29 | 1952-12-17 | Improvements in or relating to magnetic circuits for travelling wave apparatus |
Country Status (7)
Country | Link |
---|---|
US (1) | US2807743A (en) |
BE (1) | BE516533A (en) |
CH (1) | CH327480A (en) |
DE (1) | DE933579C (en) |
FR (1) | FR1060368A (en) |
GB (1) | GB726823A (en) |
NL (2) | NL173106B (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2867745A (en) * | 1953-10-07 | 1959-01-06 | Bell Telephone Labor Inc | Periodic magnetic focusing system |
DE1098625B (en) * | 1953-11-13 | 1961-02-02 | Siemens Ag | 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 |
NL200487A (en) * | 1954-09-21 | |||
NL200488A (en) * | 1954-09-22 | |||
FR1114606A (en) * | 1954-11-18 | 1956-04-16 | Csf | Improvements to permanent magnets |
US2925508A (en) * | 1955-07-28 | 1960-02-16 | Sperry Rand Corp | Electron beam focusing structure |
US2890372A (en) * | 1956-02-23 | 1959-06-09 | Raytheon Mfg Co | Traveling wave amplifiers |
US2991391A (en) * | 1957-07-24 | 1961-07-04 | Varian Associates | Electron beam discharge apparatus |
US2966609A (en) * | 1957-11-22 | 1960-12-27 | Gen Electric | Magnetic structures for high frequency energy interchange apparatus |
US3221267A (en) * | 1957-11-29 | 1965-11-30 | Raytheon Co | Method for increasing efficiency of backward wave oscillator tubes |
US3071709A (en) * | 1960-02-10 | 1963-01-01 | Raytheon Co | Traveling wave electrical discharge device |
US2999959A (en) * | 1960-04-04 | 1961-09-12 | Bell Telephone Labor Inc | Traveling wave tube |
US3283200A (en) * | 1963-12-12 | 1966-11-01 | Varian Associates | High frequency electron discharge device having improved permanent magnetic focusing |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE711458C (en) * | 1934-07-06 | 1941-10-01 | Telefunken Gmbh | Arrangement for utilizing the stray force flux of a magnet which generates an essentially constant magnetic field and between whose poles a magnetic field tube is arranged |
US2159534A (en) * | 1935-07-23 | 1939-05-23 | Firm Fernseh Ag | Cathode ray focusing coil |
DE734825C (en) * | 1937-12-10 | 1943-04-27 | Siemens Reiniger Werke Ag | Magnetic field tubes with a permanent magnet to generate the magnetic field that influences the electron flow |
GB515308A (en) * | 1938-05-25 | 1939-12-01 | Miller Harold | Improvements in or relating to magnetic electron lenses |
NL62817C (en) * | 1940-05-04 | |||
US2431077A (en) * | 1943-08-31 | 1947-11-18 | Rca Corp | Cathode-ray tube with revolving magnets and adjustable sleeve |
US2455676A (en) * | 1946-05-21 | 1948-12-07 | Rca Corp | Electron lens correction device |
US2687490A (en) * | 1949-09-22 | 1954-08-24 | Sperry Corp | High-frequency beam tube device |
US2567674A (en) * | 1949-11-08 | 1951-09-11 | Rca Corp | Velocity modulated electron discharge device |
NL89376C (en) * | 1950-06-17 | |||
US2619611A (en) * | 1951-05-29 | 1952-11-25 | Eitel Mccullough Inc | Electron tube apparatus |
-
0
- NL NL93297D patent/NL93297C/xx active
- BE BE516533D patent/BE516533A/xx unknown
- NL NLAANVRAGE7117502,A patent/NL173106B/en unknown
-
1951
- 1951-12-29 US US264096A patent/US2807743A/en not_active Expired - Lifetime
-
1952
- 1952-07-18 FR FR1060368D patent/FR1060368A/en not_active Expired
- 1952-08-23 DE DEW9300A patent/DE933579C/en not_active Expired
- 1952-12-06 CH CH327480D patent/CH327480A/en unknown
- 1952-12-17 GB GB31982/52A patent/GB726823A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE516533A (en) | |
FR1060368A (en) | 1954-04-01 |
DE933579C (en) | 1955-09-29 |
CH327480A (en) | 1958-01-31 |
NL93297C (en) | |
US2807743A (en) | 1957-09-24 |
NL173106B (en) |
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