GB740998A - Travelling wave tube - Google Patents
Travelling wave tubeInfo
- Publication number
- GB740998A GB740998A GB11762/53A GB1176253A GB740998A GB 740998 A GB740998 A GB 740998A GB 11762/53 A GB11762/53 A GB 11762/53A GB 1176253 A GB1176253 A GB 1176253A GB 740998 A GB740998 A GB 740998A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wave
- guide
- collector
- slots
- rectangular
- 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
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
- H01J25/36—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field
- H01J25/40—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field the backward travelling wave being utilised
Abstract
740,998. Travelling-wave tubes. NATIONAL RESEARCH DEVELOPMENT CORPORATION. April 28, 1953 [May 17, 1952], No. 11762/53. Class 39 (1). The delay line of a backward wave oscillator comprises a transversely and longitudinally slotted block 10, Fig. 1, the transverse slots being resonators and electron beams passing through the longitudinal slots, a ribbon helix, Fig. 2 (not shown), or an interdigital line, Fig. 3 (not shown), comprising two rows of interdigital fingers whose length tapers at the output end. The mode used is a spatial harmonic mode in which the wave travels an integral number of wavelengths less the distance between mid-points of adjacent slots 11, Fig. 1, while the beam traverses the latter distance only, and the wave is initially excited by noise components in the beam. Since the structure is dispersive, tuning can be effected by varying the beam velocity. The slow wave structure may be a wave-guide 10, Fig. 1, one wall of which is formed with transversely and longitudinally slotted fins 13. Terminating slot 14 of smaller depth and width and tapered wave-guide 25 provide impedance matching to output guide 24, and the vacuum is maintained by glass window 28 sealed to molybdenum cup 29. Slots 27 and 30 are chokes and guides 24, 25 are of rectangular section. Section 15 comprises a number of parallel bars which split up the beam into five parts and short-circuit the end of the structure for radio frequencies; the structure at the right-hand end 22 is similar. Cathode 16 contains heater 20, and control grid 17, accelerator 18 and collector 23 are flat rectangular molybdenum plates with grids across central rectangular apertures therein. The slow wave structure is non-reflectively terminated at the collector end by two tapering wedges of loss material comprising ceramic material coated with colloidal graphite, Fig. 15 (not shown), or by a separate non-reflectively terminated wave-guide (not shown). An electromagnet with poles 55, 56 supplies a longitudinal focusing field. The tungsten cathode leads are brought out perpendicular to the plane of the paper through a copper-molybdenumglass seal, Fig. 1D (not shown) and similar seals are used for the control grid 17 and collector 23, as shown. Frequency modulation is effected by modulating the accelerating voltage as indicated by source 57. In another embodiment, Fig. 2 (not shown), an annular beam flows inside and/or outside a ribbon helix, Fig. 2 (not shown) or similarly-shaped ribbon. The helix may be formed by cutting a helical groove in a hollow cylinder, and the pitch of the groove may be tapered at the gun end to give a better impedance match to the output guide. The non- reflecting termination at the collector end is a ceramic block having a cylindrical outer and a conical inner surface, the inner surface being coated with colloidal graphite. In another embodiment, Fig. 3 (not shown) an interdigitated delay line is used. The magnetically focused annular beam passes between two rows of interdigitated fingers extending from the broader walls of a rectangular wave-guide. The fins decrease in length near the output guide for impedance matching and interleave over the main part of the line. A 45 degrees deflector plate diverts the waves into the output guide which extends at an angle of 90 degrees with the main part of the tube. The collector end is non-reflectively terminated by two inclined ceramic plates coated with loss material. Since the field between fingers reverses at each successive gap the wave must traverse an integral number of half-wavelengths less the average distance between successive gaps while the beam traverses only the latter distance.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US288437A US2985790A (en) | 1952-05-17 | 1952-05-17 | Backward wave tube |
Publications (1)
Publication Number | Publication Date |
---|---|
GB740998A true GB740998A (en) | 1955-11-23 |
Family
ID=23107094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB11762/53A Expired GB740998A (en) | 1952-05-17 | 1953-04-28 | Travelling wave tube |
Country Status (6)
Country | Link |
---|---|
US (1) | US2985790A (en) |
BE (1) | BE520013A (en) |
DE (1) | DE1084322B (en) |
FR (1) | FR1080027A (en) |
GB (1) | GB740998A (en) |
NL (2) | NL94448C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2942142A (en) * | 1957-08-30 | 1960-06-21 | Raytheon Co | Traveling wave oscillator tubes |
US2963615A (en) * | 1955-07-22 | 1960-12-06 | Hughes Aircraft Co | Broadband traveling-wave amplifier |
US3065373A (en) * | 1955-11-29 | 1962-11-20 | Bell Telephone Labor Inc | High frequency apparatus of the traveling wave type |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2899594A (en) * | 1959-08-11 | johnson | ||
US2955226A (en) * | 1955-06-13 | 1960-10-04 | Univ California | Backward-wave amplifier |
US2945981A (en) * | 1955-06-13 | 1960-07-19 | Bell Telephone Labor Inc | Magnetron-type traveling wave tube |
US2748268A (en) * | 1955-06-15 | 1956-05-29 | Hughes Aircraft Co | Backward-wave oscillator mixer |
US2869019A (en) * | 1955-07-07 | 1959-01-13 | Hughes Aircraft Co | Reflex space-harmonic oscillator |
US2906914A (en) * | 1955-08-18 | 1959-09-29 | Bell Telephone Labor Inc | Traveling wave tube |
US2890372A (en) * | 1956-02-23 | 1959-06-09 | Raytheon Mfg Co | Traveling wave amplifiers |
US2925521A (en) * | 1957-04-05 | 1960-02-16 | Raytheon Co | Traveling wave tubes |
US3264515A (en) * | 1961-06-29 | 1966-08-02 | Varian Associates | Collinear termination for high energy particle linear accelerators |
FR1311310A (en) * | 1961-10-24 | 1962-12-07 | Csf | Improvements to delay circuits for type m microwave tubes |
GB1066644A (en) * | 1963-07-12 | 1967-04-26 | Matsushita Electronics Corp | Hermetic window construction of waveguide for extremely high frequency electronic tubes |
US3414756A (en) * | 1965-12-28 | 1968-12-03 | Sfd Lab Inc | Impedance matched periodic microwave circuits and tubes using same |
US4409519A (en) * | 1981-07-29 | 1983-10-11 | Varian Associates, Inc. | TWT Slow-wave structure assembled from three ladder-like slabs |
US8416408B1 (en) | 2009-02-27 | 2013-04-09 | J.A. Woollam Co., Inc. | Terahertz-infrared ellipsometer system, and method of use |
US8736838B2 (en) | 2009-02-27 | 2014-05-27 | J.A. Woollam Co., Inc. | Terahertz ellipsometer system, and method of use |
US8169611B2 (en) | 2009-02-27 | 2012-05-01 | University Of Nebraska Board Of Regents | Terahertz-infrared ellipsometer system, and method of use |
US8934096B2 (en) | 2009-02-27 | 2015-01-13 | University Of Nebraska Board Of Regents | Terahertz-infrared ellipsometer system, and method of use |
US8488119B2 (en) | 2009-02-27 | 2013-07-16 | J.A. Woollam Co., Inc. | Terahertz-infrared ellipsometer system, and method of use |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL140780B (en) * | 1947-06-07 | Dymo Industries Inc | BANDMARK TOOL. | |
FR979095A (en) * | 1948-11-26 | 1951-04-23 | Csf | Further development of traveling wave amplifier tubes |
US2603773A (en) * | 1948-12-09 | 1952-07-15 | Bell Telephone Labor Inc | Modulated oscillator |
US2801361A (en) * | 1948-12-10 | 1957-07-30 | Bell Telephone Labor Inc | High frequency amplifier |
NL154235B (en) * | 1949-06-17 | Kansai Paint Co Ltd | PROCESS FOR THE PREPARATION OF ALKYD RESINS AND OBJECTS COVERED ON THE BASIS OF ALKYD RESINS SO OBTAINED. | |
US2708236A (en) * | 1950-03-18 | 1955-05-10 | Bell Telephone Labor Inc | Microwave amplifiers |
BE510250A (en) * | 1951-04-13 | |||
NL177251C (en) * | 1952-04-01 | Us Energy | PHOTOMETRIC ANALYSIS DEVICE WITH A ROTOR INCLUDING A NUMBER OF SAMPLE CUVETTES. | |
US2880355A (en) * | 1952-04-09 | 1959-03-31 | Csf | Backward flow travelling wave oscillators |
-
0
- NL NLAANVRAGE7902950,A patent/NL178359B/en unknown
- BE BE520013D patent/BE520013A/xx unknown
- NL NL94448D patent/NL94448C/xx active
-
1952
- 1952-05-17 US US288437A patent/US2985790A/en not_active Expired - Lifetime
-
1953
- 1953-04-28 GB GB11762/53A patent/GB740998A/en not_active Expired
- 1953-05-04 FR FR1080027D patent/FR1080027A/en not_active Expired
- 1953-05-16 DE DEN7193A patent/DE1084322B/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2963615A (en) * | 1955-07-22 | 1960-12-06 | Hughes Aircraft Co | Broadband traveling-wave amplifier |
US3065373A (en) * | 1955-11-29 | 1962-11-20 | Bell Telephone Labor Inc | High frequency apparatus of the traveling wave type |
US2942142A (en) * | 1957-08-30 | 1960-06-21 | Raytheon Co | Traveling wave oscillator tubes |
Also Published As
Publication number | Publication date |
---|---|
NL94448C (en) | |
US2985790A (en) | 1961-05-23 |
DE1084322B (en) | 1960-06-30 |
NL178359B (en) | |
BE520013A (en) | |
FR1080027A (en) | 1954-12-06 |
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