GB815836A - Improvements in or relating to electron discharge devices including magnetic focussing arrangements - Google Patents
Improvements in or relating to electron discharge devices including magnetic focussing arrangementsInfo
- Publication number
- GB815836A GB815836A GB32265/56A GB3226556A GB815836A GB 815836 A GB815836 A GB 815836A GB 32265/56 A GB32265/56 A GB 32265/56A GB 3226556 A GB3226556 A GB 3226556A GB 815836 A GB815836 A GB 815836A
- Authority
- GB
- United Kingdom
- Prior art keywords
- flux guide
- magnet
- polepieces
- field
- magnetic
- 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
-
- 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
Landscapes
- Particle Accelerators (AREA)
Abstract
815,836. Magnets. WESTERN ELECTRIC CO. Inc. Oct. 23, 1956 [Oct. 27, 1955], No. 32265/56. Class 35. [Also in Group XL (a)] In a travelling-wave tube apparatus, the electron beam is focused by a permanent magnet having a central tunnel within which is a flux guide consisting of two plates on either side of the delay line, or preferably a cylinder surrounding the delay line. The permanent magnet may be specially shaped, e.g. by making it at least partly elliptical or ellipsoidal, or the flux guide may be specially shaped, e.g. by decreasing its thickness from both ends towards the centre, so as to make the magnetic field axial, parallel, and uniform. The magnetic field extends over the entire length of the delay line. In one form, Figs. 1, 2, the permanent magnet 10 comprises a central portion 11 with elliptical side walls and a tunnel 12 for the electron beam and helix, and having flat top and bottom walls abutting upper and lower sections 13, 14 which project at the sides and ends, and has elliptically shaped ends 15 to maintain the field uniformity in the end spaces which house the waveguide feeders. The whole magnet of Alnico V or VI producing a field of 6000 gauss can be a single integral unit or can be in two equal sections divided by a plane through the major axis of the main ellipse, or each of the centre upper and lower sections can be separate members secured together. The flux guide 25, which may be a thin-walled seamless iron tube, has rectangular polepieces 27, and further polepieces 28 are arranged at the ends of the upper and lower magnet sections. The flux guide can be used to adjust the linearity of the field by providing the magnet 10 with a framework 31 having adjustment screws 32, 33, 34, screws 32, 33 (screws 33 via spring fingers 38) varying the position of polepieces 27 in two transverse directions at right-angles to one another. Screws 34 vary the transverse position of polepieces 28. Undesired transverse magnetic field components due to inhomogeneities in the magnetic material and to the closeness of the magnetic material to the axis can be compensated by (a) the shielding effect of the flux guide tube 25; (b) coaxial rings of magnetic material supported on a non-magnetic tube surrounding the flux guide 25 and spaced apart from one another by non-magnetic rings, Fig. 3 (not shown), or a single tube of magnetic material with suitable non-magnetic supports; (c) (used with or without (b)) by high u discs, fixed to and extending inwardly from the walls of the flux guide, Fig. 4 (not shown). Flux guides 30, preferably rectangular plates, may be used in the end spaces or bridging areas for field uniformity and adjustment, particularly when the bridging top and bottom magnet parts do not have elliptical ends as in the embodiment of Figs. 5, 6 (not shown). In Figs. 5, 6 (not shown), a single unit permanent magnet of rectangular cross-section contains in the cylindrical tunnel thereof a cylindrical flux guide whose thickness varies linearly from a minimum at the centre to a maximum at the ends to give a uniform rectilinear field inside it and flux guide plates similarly tapered in the end or bridging spaces of rectangular cross-section. In another form, Fig. 7, the magnet is wholly ellipsoidal apart from the cut away end portions and no special shaping of the flux guide is necessary. The end of tunnel 203 of square or rectangular section assist in coupling to waveguide feeders, and flat flux guide plates are positioned inside the tunnel 203, the flux guide plates extending also over the full thickness of the polepieces at each end of the magnet. A single cylindrical flux guide of uniform wall thickness extends from end to end of the magnet structure, Fig. 8 (not shown). The flux guide can be moved transversely for field rectilinearity adjustments by screws acting on the polepieces at the ends of the magnet. The input and output feeders can be coaxial lines, Fig. 8 (not shown). Either or both of the shielding devices of Figs. 3, 4 (not shown) can be used in Figs. 5, 6, 7 or 8 (Fig. 7 only shown). Specification 726,823 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US543235A US2871395A (en) | 1955-10-27 | 1955-10-27 | Magnetic structures for traveling wave tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB815836A true GB815836A (en) | 1959-07-01 |
Family
ID=24167148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB32265/56A Expired GB815836A (en) | 1955-10-27 | 1956-10-23 | Improvements in or relating to electron discharge devices including magnetic focussing arrangements |
Country Status (6)
Country | Link |
---|---|
US (1) | US2871395A (en) |
BE (1) | BE550523A (en) |
CH (1) | CH352746A (en) |
FR (1) | FR1154734A (en) |
GB (1) | GB815836A (en) |
NL (1) | NL209831A (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL200487A (en) * | 1954-09-21 | |||
US3007076A (en) * | 1957-05-03 | 1961-10-31 | Itt | Traveling wave electron discharge device |
US2991382A (en) * | 1958-03-20 | 1961-07-04 | Nippon Electric Co | Electron beam tube focusing device |
NL98136C (en) * | 1958-06-27 | |||
US3001094A (en) * | 1959-01-14 | 1961-09-19 | Nippon Electric Co | Magnetic focusing device |
NL250375A (en) * | 1959-04-13 | |||
NL256575A (en) * | 1959-12-03 | |||
US3084279A (en) * | 1960-02-10 | 1963-04-02 | Raytheon Co | Travelling wave devices |
US2999959A (en) * | 1960-04-04 | 1961-09-12 | Bell Telephone Labor Inc | Traveling wave tube |
US3133226A (en) * | 1960-10-07 | 1964-05-12 | Westinghouse Electric Corp | Magnetic structure for traveling wave tubes |
US3155866A (en) * | 1961-03-14 | 1964-11-03 | Bell Telephone Labor Inc | Magnetic focusing structure for traveling wave tubes |
DE1273704B (en) * | 1961-12-16 | 1968-07-25 | Telefunken Patent | Method for aligning the magnetic axis of a magnet arrangement with the electron beam axis of a transit time tube and arrangement for carrying out the method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2733364A (en) * | 1956-01-31 | flory | ||
US2774006A (en) * | 1950-10-14 | 1956-12-11 | Univ Leland Stanford Junior | Travelling wave tube apparatus |
US2707758A (en) * | 1950-12-19 | 1955-05-03 | Sperry Corp | Travelling wave tube |
US2752523A (en) * | 1951-05-15 | 1956-06-26 | Int Standard Electric Corp | Electron discharge apparatus |
US2701321A (en) * | 1951-07-16 | 1955-02-01 | Sperry Corp | Adjustable magnetic focusing system for beam tubes |
US2741718A (en) * | 1953-03-10 | 1956-04-10 | Sperry Rand Corp | High frequency apparatus |
-
0
- BE BE550523D patent/BE550523A/xx unknown
- NL NL209831D patent/NL209831A/xx unknown
-
1955
- 1955-10-27 US US543235A patent/US2871395A/en not_active Expired - Lifetime
-
1956
- 1956-06-27 FR FR1154734D patent/FR1154734A/en not_active Expired
- 1956-10-08 CH CH352746D patent/CH352746A/en unknown
- 1956-10-23 GB GB32265/56A patent/GB815836A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2871395A (en) | 1959-01-27 |
BE550523A (en) | |
CH352746A (en) | 1961-03-15 |
FR1154734A (en) | 1958-04-16 |
NL209831A (en) |
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