GB737001A - Improvements in or relating to reflex velocity modulated electron discharge devices - Google Patents

Improvements in or relating to reflex velocity modulated electron discharge devices

Info

Publication number
GB737001A
GB737001A GB24455/52A GB2445552A GB737001A GB 737001 A GB737001 A GB 737001A GB 24455/52 A GB24455/52 A GB 24455/52A GB 2445552 A GB2445552 A GB 2445552A GB 737001 A GB737001 A GB 737001A
Authority
GB
United Kingdom
Prior art keywords
cathode
resonator
coating
discs
uniformly coated
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
Application number
GB24455/52A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raytheon Co
Original Assignee
Raytheon Manufacturing Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Raytheon Manufacturing Co filed Critical Raytheon Manufacturing Co
Publication of GB737001A publication Critical patent/GB737001A/en
Expired legal-status Critical Current

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
    • H01J25/02—Tubes with electron stream modulated in velocity or density in a modulator zone and thereafter giving up energy in an inducing zone, the zones being associated with one or more resonators
    • H01J25/22—Reflex klystrons, i.e. tubes having one or more resonators, with a single reflection of the electron stream, and in which the stream is modulated mainly by velocity in the modulator zone
    • H01J25/24—Reflex klystrons, i.e. tubes having one or more resonators, with a single reflection of the electron stream, and in which the stream is modulated mainly by velocity in the modulator zone in which the electron stream is in the axis of the resonator or resonators and is pencil-like before reflection

Landscapes

  • Microwave Tubes (AREA)

Abstract

737,001. Velocity-modulated tubes. RAYTHEON MANUFACTURING CO. Sept. 30, 1952 [March 10, 1952], No. 24455/52. Class 39 (1). In a reflex klystron in which the resonant circuit has a single gap traversed by a single electron beam, the cathode emissive surface is irregularly shaped and/or non-uniformly coated with emissive material, or is covered by an auxiliary grid, so as to cause the density of the beam to vary across its cross-section in such a way that hysteresis is reduced. Fig. 2 shows a non-uniform coating, i.e. in discrete areas 3, and Figs. 3A, 3B an irregular shape which may be uniformly coated. The irregularly shaped form is preferred. Hysteresis is defined as the dependance of amplitude and frequency of oscillation upon the direction from which the reflector voltage is approached, this voltage being varied, for example, to accommodate a variation in oscillation frequency. It is stated that due to space charge effect (for non-uniform coatings) or due to the irregular shape of the cathode, which disturbs the equi-potential field lines between the cathode and accelerator, the returning electrons are subjected to different field conditions adjacent the cathode so that when approaching the resonator gap for a third time they arrive spread out instead of bunched. Consequently, they cannot effect any net interchange of energy with the resonator. The accelerating grid is carried by a heat shield surrounding the cathode. The resonator grids are mounted on metal discs sealed through the envelope by means of flanges on the discs and retaining rings. The discs are connected externally to a cavity resonator or other tuned circuit. An irregular coating on the cathode may be produced by scraping areas from a uniform coating, spraying the coating on to the cathode through a stencil, coarse sintering of the cathode on exhaust, or " poisoning " of various areas. Alternatively, a metal grid may be placed adjacent a uniformly coated cathode.
GB24455/52A 1952-03-10 1952-09-30 Improvements in or relating to reflex velocity modulated electron discharge devices Expired GB737001A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US275808A US2782334A (en) 1952-03-10 1952-03-10 Velocity modulated electron discharge devices

Publications (1)

Publication Number Publication Date
GB737001A true GB737001A (en) 1955-09-21

Family

ID=23053887

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24455/52A Expired GB737001A (en) 1952-03-10 1952-09-30 Improvements in or relating to reflex velocity modulated electron discharge devices

Country Status (3)

Country Link
US (1) US2782334A (en)
FR (1) FR1069704A (en)
GB (1) GB737001A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172426A (en) * 1985-02-06 1986-09-17 New Japan Radio Co Ltd Cathodes for magnetrons

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2943234A (en) * 1956-02-24 1960-06-28 Varian Associates Charged particle flow control apparatus
US3205392A (en) * 1960-04-01 1965-09-07 Gen Electric Brillouin beam forming apparatus
NL269891A (en) * 1960-10-14
US3175118A (en) * 1962-05-28 1965-03-23 Gen Electric Low power heater
US3377492A (en) * 1965-08-03 1968-04-09 Hughes Aircraft Co Flood gun for storage tubes having a dome-shaped cathode and dome-shaped grid electrodes
DE1614158A1 (en) * 1967-05-13 1971-04-29 Mueller C H F Gmbh Cathode for X-ray tubes
US3558967A (en) * 1969-06-16 1971-01-26 Varian Associates Linear beam tube with plural cathode beamlets providing a convergent electron stream
US3783325A (en) * 1971-10-21 1974-01-01 Us Army Field effect electron gun having at least a million emitting fibers per square centimeter
DE2449796C3 (en) * 1974-10-19 1980-03-06 Philips Patentverwaltung Gmbh, 2000 Hamburg Supply cathode for a grid-controlled electron tube and process for their manufacture
US3967150A (en) * 1975-01-31 1976-06-29 Varian Associates Grid controlled electron source and method of making same
GB2029632B (en) * 1978-09-02 1982-08-11 English Electric Valve Co Ltd Magnetrons
US4680500A (en) * 1986-03-06 1987-07-14 The United States Of America As Represented By The Secretary Of The Air Force Integral grid/cathode for vacuum tubes

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1797990A (en) * 1926-02-06 1931-03-24 Arsene N Lucian Heater construction for cathodes
US2292437A (en) * 1935-07-01 1942-08-11 Farnsworth Television & Radio Electron image amplifier
US2180710A (en) * 1936-03-19 1939-11-21 Telefunken Gmbh Cathode ray tube screen
BE434648A (en) * 1938-06-02
US2207846A (en) * 1938-06-30 1940-07-16 Rca Corp Electronic discharge device
US2322807A (en) * 1940-12-28 1943-06-29 Rca Corp Electron discharge device and system
US2459792A (en) * 1944-07-08 1949-01-25 Standard Telephones Cables Ltd Beam type electron discharge device
US2506627A (en) * 1945-09-14 1950-05-09 Emi Ltd Electron discharge device
US2581408A (en) * 1947-04-16 1952-01-08 Sperry Corp High-frequency electron discharge device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172426A (en) * 1985-02-06 1986-09-17 New Japan Radio Co Ltd Cathodes for magnetrons
GB2172426B (en) * 1985-02-06 1989-06-14 New Japan Radio Co Ltd Cathode for magnetron

Also Published As

Publication number Publication date
US2782334A (en) 1957-02-19
FR1069704A (en) 1954-07-12

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