US2498673A - Velocity modulation tube - Google Patents

Velocity modulation tube Download PDF

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Publication number
US2498673A
US2498673A US749513A US74951347A US2498673A US 2498673 A US2498673 A US 2498673A US 749513 A US749513 A US 749513A US 74951347 A US74951347 A US 74951347A US 2498673 A US2498673 A US 2498673A
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US
United States
Prior art keywords
tube
velocity modulation
space
catcher
drift
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 - Lifetime
Application number
US749513A
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English (en)
Inventor
Goudet Georges
Musson-Genon Rene
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
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Publication of US2498673A publication Critical patent/US2498673A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators
    • 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
    • H01J25/10—Klystrons, i.e. tubes having two or more resonators, without reflection of the electron stream, and in which the stream is modulated mainly by velocity in the zone of the input resonator
    • H01J25/12—Klystrons, i.e. tubes having two or more resonators, without reflection of the electron stream, and in which the stream is modulated mainly by velocity in the zone of the input resonator with pencil-like electron stream in the axis of the resonators

Definitions

  • the present invention relates to electron velocity modulation tubes.
  • the electron beam traverses a space between the resonant chambers, which is called the drift space and which is in association with so-called buncher and catcher spaces, these being respectively in the nearest and furthest portions of the resonant chambers, with respect to the cathode.
  • One of the objects of the present invention is to increase the band width of velocity modulation tubes. Another object of the invention is to increase the power delivered by such tubes.
  • Another object of the present invention is to prolong the life of the cathodes of velocity modulation tubes.
  • the catcher space is of small size, and this permits the use of resonant chambers having a relatively low Q factor.
  • the drift space is of conical shape, the widest part of the electron beam being adjacent to the cathode, and the most concentrated part of the beam being at the catcher space.
  • Fig. 1 is a diagrammatic sectional view illustrating one example of a two-chamber velocity modulation tube incorporating features of the invention.
  • Fig. 2 is a diagrammatic sectional View illustrating one example of the application of the invention to a single chamber velocity modulation tube of concentric type.
  • Fig. 1 shows the application of the invention to a velocity modulation tube having two resonant chambers.
  • the cathode is shown at l.
  • This cathode may be of appreciable size and have an annular emitting surface, for example as shown.
  • the so-called Wehnelt focussing electrode is shown at 2.
  • the electron beam 3 enters the drift space of conical shape shown at 4.
  • the electron beam accordingly assumes a conical form.
  • the first resonant chamber is shown at 6, and the second one at 1.
  • the outlet tube of the electron beam is preferably flared as indicated at 9,
  • the illustrated arrangement makes it possible to obtain at the catcher space 5 a very great concentration of current by purely electric means, without intervention of magnetic fields, and with a cathode having a low coeicient of emission per unit of surface.
  • Suitable input and output terminals, not shown, would be associated with the resonators in Well known manner.
  • one advantage of the arrangement of the present invention is thatit permits the obtaining of a greater band width by making it possible to employ a lower Q factor and therefore to have a higher resistance load so that greater power is derived from the tube.
  • the means provided by thefinvention/mafke/it possible to obtain this result with c'athodeswh'ose coefficient of emission may be very small, ⁇ beoutwardly flared towards said electrodes.
  • a velocity modulation tube comprising a fbuncherresonatoL- a'catcher resonator, a conical driftv 'tube-"between :said resonators, the walls of l bojtliovf ysaidresonators being provided with recause it becomes possible to gine them. aumore" considerable surface than would be :possible/by'.
  • Fig. 2 illustrates another example of embodimentadapted :to another type rof velocity ⁇ modulation tube having-a concentric structurefthatcomprisesian ⁇ outerpart 2D andaf'central, part 2i VThe.zrathode .is shown at 22, and the :electron beam passes into 'the channel 23- and through the drift space y24.
  • the drift-space 24 is of conicalshape, with a relatively large ⁇ surfaceas it leavesqcathodefZZ andra-small one when it reaches'the ycatcher space 26.
  • the ysingle resonant chamber . is formed by :the concentric space .between the inner Vand-outer partsz and f2i..
  • a "velocity modulation tube comprising a cavity resonator, a conical drift "tube withinz'sad resonator', k"said/resonator having reentrant walls in'lmewith'said conical drift tube, said walls defining-a pair of oppositely'disposediopenings said entrant openings in line with said drift tube and spacediresp'ectivelyifrom the ends thereof to form .buncher and catcher spaces, said openings being 'ofvidiierentsze to cooperate respectively with the :.basle'anditheapex portions of said drift tube and means adjacent the opening in said buncher resvcna-tor"forprojecting a beam of electrons through said drift tube and said buncher and catcher spacestirr ⁇ the directiony fromfthe :,baseto i 'thef'apex ofv said"monica-ly tube.

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  • Particle Accelerators (AREA)
  • Microwave Tubes (AREA)
US749513A 1945-09-22 1947-05-21 Velocity modulation tube Expired - Lifetime US2498673A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR660107X 1945-09-22

Publications (1)

Publication Number Publication Date
US2498673A true US2498673A (en) 1950-02-28

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ID=9010053

Family Applications (1)

Application Number Title Priority Date Filing Date
US749513A Expired - Lifetime US2498673A (en) 1945-09-22 1947-05-21 Velocity modulation tube

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Country Link
US (1) US2498673A (pt)
FR (1) FR961000A (pt)
GB (1) GB660107A (pt)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680209A (en) * 1950-05-12 1954-06-01 Sperry Corp High-frequency apparatus
US2888599A (en) * 1953-10-05 1959-05-26 Varian Associates Electron discharge apparatus
US2996639A (en) * 1953-10-05 1961-08-15 Varian Associates Electron discharge apparatus of the beam type
DE1121741B (de) * 1955-11-19 1962-01-11 Varian Associates Laufzeitroehre
US3458750A (en) * 1966-01-12 1969-07-29 Servodyne Corp Klystron tube having feedback means and a control lens

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2191253B1 (pt) * 1972-06-27 1978-03-03 Thomson Csf

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2003775A (en) * 1932-05-14 1935-06-04 Schlesinger Kurt Braun tube
US2261130A (en) * 1938-06-21 1941-11-04 Univ Leland Stanford Junior High frequency radio apparatus
US2269456A (en) * 1938-01-22 1942-01-13 Univ Leland Stanford Junior Electron beam oscillator
US2406370A (en) * 1938-07-08 1946-08-27 Univ Leland Stanford Junior Electronic oscillator-detector
US2408216A (en) * 1942-03-06 1946-09-24 Rca Corp Beam deflection electron discharge device
US2422695A (en) * 1943-05-07 1947-06-24 Bell Telephone Labor Inc Suppression of parasitic oscillations in high-frequency devices
US2444434A (en) * 1943-01-22 1948-07-06 Sperry Corp Velocity modulation discharge tube apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2003775A (en) * 1932-05-14 1935-06-04 Schlesinger Kurt Braun tube
US2269456A (en) * 1938-01-22 1942-01-13 Univ Leland Stanford Junior Electron beam oscillator
US2261130A (en) * 1938-06-21 1941-11-04 Univ Leland Stanford Junior High frequency radio apparatus
US2406370A (en) * 1938-07-08 1946-08-27 Univ Leland Stanford Junior Electronic oscillator-detector
US2408216A (en) * 1942-03-06 1946-09-24 Rca Corp Beam deflection electron discharge device
US2444434A (en) * 1943-01-22 1948-07-06 Sperry Corp Velocity modulation discharge tube apparatus
US2422695A (en) * 1943-05-07 1947-06-24 Bell Telephone Labor Inc Suppression of parasitic oscillations in high-frequency devices

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680209A (en) * 1950-05-12 1954-06-01 Sperry Corp High-frequency apparatus
US2888599A (en) * 1953-10-05 1959-05-26 Varian Associates Electron discharge apparatus
US2996639A (en) * 1953-10-05 1961-08-15 Varian Associates Electron discharge apparatus of the beam type
DE1121741B (de) * 1955-11-19 1962-01-11 Varian Associates Laufzeitroehre
US3458750A (en) * 1966-01-12 1969-07-29 Servodyne Corp Klystron tube having feedback means and a control lens

Also Published As

Publication number Publication date
FR961000A (pt) 1950-04-28
GB660107A (en) 1951-10-31

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