GB649273A - Improvements in or relating to electron velocity modulation apparatus - Google Patents

Improvements in or relating to electron velocity modulation apparatus

Info

Publication number
GB649273A
GB649273A GB2003/48A GB200348A GB649273A GB 649273 A GB649273 A GB 649273A GB 2003/48 A GB2003/48 A GB 2003/48A GB 200348 A GB200348 A GB 200348A GB 649273 A GB649273 A GB 649273A
Authority
GB
United Kingdom
Prior art keywords
drift tube
resonator
cylinder
magnetic
tube
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
GB2003/48A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB649273A publication Critical patent/GB649273A/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
    • H01J25/10—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

Landscapes

  • Microwave Tubes (AREA)

Abstract

649,273. Velocity-modulated tubes. STANDARD TELEPHONES & CABLES, Ltd. Jan. 22, 1948, No. 2003. Convention date, Jan. 22, 1947. [Class 39 (i)] An electron velocity modulation device comprising an input and an output cavity resonator separated by a drift tube adapted to be held at a D.C. potential different from that of the resonators and means for projecting an annular beam of electrons in succession through the input resonator the drift tube and the output resonator is characterized in that the said resonators and drift tube are constructed of magnetic material and are adapted to be magnetically polarized so as to form a magnetic lens on either side of the drift tube, the drift tube being oppositely polarized at its two ends. In the arrangement shown, the drift tube 6 is made of magnetized steel, the magnetic circuit being completed by a soft iron cylinder 9 joining the input resonator 4 and the output resonator 8. The annular electron beam 12, Fig. 2, from the cathode 1 is brought to a crossover at the interaction gap formed by the reentrant wall of resonator 4. The magnetic field 13 between the end of the drift tube. and the adjacent resonator wall causes the divergent electron beam to be collimated as a hollow cylindrical beam through the drift tube 6. After emerging from the drift tube, the electron beam is converged again along the path 15 to form a cross-over at the interaction gap of resonator 8. Maintainance of the shape of the beam throughout the length of the drift tube may be assisted by means of a rod-shaped conducting member of non-magnetic material introduced axially into the drift tube and held at a lower potential than that of the drift tube. This rod expands the cylindrical beam and thus lowers the current density and hence the space charge in the drift tube. In an alternative construction, the permanent magnet drift tube is replaced by a cylinder of soft iron magnetized by a coil surrounding the cylinder and enclosed in a glass envelope. In other alternative constructions the resonators and the drift tube are made of soft iron, the cylinder 9 is omitted and appropriate magnetic. fields to produce the lenses are provided by a cylindrical permanent or electromagnet surrounding the envelope of the tube. Specification 597,511 is referred to.
GB2003/48A 1947-01-22 1948-01-22 Improvements in or relating to electron velocity modulation apparatus Expired GB649273A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR940291T 1947-01-22

Publications (1)

Publication Number Publication Date
GB649273A true GB649273A (en) 1951-01-24

Family

ID=9460982

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2003/48A Expired GB649273A (en) 1947-01-22 1948-01-22 Improvements in or relating to electron velocity modulation apparatus

Country Status (2)

Country Link
FR (1) FR940291A (en)
GB (1) GB649273A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939994A (en) * 1957-01-28 1960-06-07 Westinghouse Electric Corp Electron discharge device
DE1125085B (en) * 1958-12-30 1962-03-08 Siemens Ag Single slit transit time tube with a reflector electrode for generating very short electrical waves
DE1190108B (en) * 1955-09-29 1965-04-01 Telefunken Patent Device for the bundled guidance of the electron beam of a running field tube
DE1241537B (en) * 1960-01-08 1967-06-01 Philips Nv Electron beam tube in the manner of a reflex klystron for generating millimeter waves and in the manner of a two-chamber klystron for amplifying millimeter waves

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB904363A (en) * 1958-04-30 1962-08-29 English Electric Valve Co Ltd Improvements in or relating to microwave oscillators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1190108B (en) * 1955-09-29 1965-04-01 Telefunken Patent Device for the bundled guidance of the electron beam of a running field tube
US2939994A (en) * 1957-01-28 1960-06-07 Westinghouse Electric Corp Electron discharge device
DE1125085B (en) * 1958-12-30 1962-03-08 Siemens Ag Single slit transit time tube with a reflector electrode for generating very short electrical waves
DE1241537B (en) * 1960-01-08 1967-06-01 Philips Nv Electron beam tube in the manner of a reflex klystron for generating millimeter waves and in the manner of a two-chamber klystron for amplifying millimeter waves

Also Published As

Publication number Publication date
FR940291A (en) 1948-12-08

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