GB1406938A - Periodic magnetically focused beam tube - Google Patents

Periodic magnetically focused beam tube

Info

Publication number
GB1406938A
GB1406938A GB3700473A GB3700473A GB1406938A GB 1406938 A GB1406938 A GB 1406938A GB 3700473 A GB3700473 A GB 3700473A GB 3700473 A GB3700473 A GB 3700473A GB 1406938 A GB1406938 A GB 1406938A
Authority
GB
United Kingdom
Prior art keywords
wave
plate
ceramic plates
interaction
magnetized
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
GB3700473A
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.)
Varian Medical Systems Inc
Original Assignee
Varian Associates Inc
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 Varian Associates Inc filed Critical Varian Associates Inc
Publication of GB1406938A publication Critical patent/GB1406938A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H01J21/18—Tubes with a single discharge path having magnetic control means; having both magnetic and electrostatic control means
    • 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
    • H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing

Landscapes

  • Microwave Tubes (AREA)

Abstract

1406938 Velocity - modulated tubes; magnetization VARIAN ASSOCIATES 3 Aug 1973 [7 Aug 1972] 37004/73 Headings H1D and H1P The periodic permanent magnet focusing system of a microwave beam tube, e.g. a travelling-wave tube or klystron, is formed by a homogeneous permanently magnetizable plate 24 magnetized in a periodic pattern of alternating polarity along the beam path. The plate 24 may be of ferromagnetic material, or permanently magnetized material in a binder, e.g. barium ferrite embedded in silicone rubber, which may be flexible to permit winding into a cylindrical shape for use with pencil or hollow cylindrical electron beams. The plate is magnetized in the desired pattern by use of a soft iron comb structure having energizing coils wound around the base of the comb teeth, with the direction of current arranged in opposite senses in the coils of adjacent teeth. As shown, a travelling wave tube having an envelope formed by a pair of alumina or beryllia ceramic plates 12, 13 sealed together at their edges, has pair of magnetic systems 23, 24 disposed on the outer surfaces of the plates, and includes a cathode 17-e.g. a directly heated tungsten ribbon-and, printed on the inner surface of each plate, a slow-wave structure 18, focusing electrodes 21 and 22, and collector 19, connection to the components being effected via conducting pins passing through the ceramic plates. In further embodiments, a plurality of tubes (Fig. 8, not shown) having a common cathode (17) and a common envelope are formed by printing a plurality of slow-wave structures on the ceramic plates for interaction with a common sheet electron beam; and (Fig. 9, not shown) a coupled backward-wave oscillator 18<SP>1</SP> and forward wave amplifier 18 are printed on the same pair of ceramic plates for interaction with a common sheet electron beam. Reference is made to an extended interaction klystron structure.
GB3700473A 1972-08-07 1973-08-03 Periodic magnetically focused beam tube Expired GB1406938A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27840872A 1972-08-07 1972-08-07

Publications (1)

Publication Number Publication Date
GB1406938A true GB1406938A (en) 1975-09-17

Family

ID=23064862

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3700473A Expired GB1406938A (en) 1972-08-07 1973-08-03 Periodic magnetically focused beam tube

Country Status (7)

Country Link
US (1) US3787747A (en)
JP (1) JPS49124962A (en)
DE (1) DE2338061A1 (en)
FR (1) FR2195838B1 (en)
GB (1) GB1406938A (en)
IL (1) IL42696A (en)
IT (1) IT992766B (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909651A (en) * 1974-08-15 1975-09-30 Us Army Low-cost periodic permanent magnet and electrostatic focusing scheme for electron tubes
US3982152A (en) * 1974-11-25 1976-09-21 Raytheon Company Cascade crossed field device
US3971965A (en) * 1975-03-31 1976-07-27 The United States Of America As Represented By The Secretary Of The Army Internally-focused traveling wave tube
US4107573A (en) * 1977-02-02 1978-08-15 The United States Of America As Represented By The Secretary Of The Army Printed circuit traveling wave tube
US4232249A (en) * 1978-09-28 1980-11-04 Bell Telephone Laboratories, Incorporated Beam-switched traveling wave tube
US4392078A (en) * 1980-12-10 1983-07-05 General Electric Company Electron discharge device with a spatially periodic focused beam
US5227691A (en) * 1989-05-24 1993-07-13 Matsushita Electric Industrial Co., Ltd. Flat tube display apparatus
AU6086994A (en) * 1993-01-11 1994-08-15 Real Time Electronics Corporation High frequency scan converter
US6700454B2 (en) 2001-06-29 2004-03-02 Zvi Yaniv Integrated RF array using carbon nanotube cathodes
US7037370B2 (en) * 2003-02-06 2006-05-02 Mearini Gerald T Free-standing diamond structures and methods
FR2856189B1 (en) * 2003-06-10 2007-02-16 Hutchinson METHOD FOR MANUFACTURING A MAGNETIC ENCODING DEVICE, AND THE DEVICE THUS OBTAINED
WO2005017939A2 (en) * 2003-06-30 2005-02-24 Massachusetts Institute Of Technology Ribbon-beam travelling wave amplifier with a single-sided slow-wave structure
US7193485B2 (en) 2003-08-12 2007-03-20 James A. Dayton, Jr. Method and apparatus for bi-planar backward wave oscillator
WO2008008504A2 (en) * 2006-07-13 2008-01-17 Manhattan Technologies, Llc Apparatus and method for producing electromagnetic oscillations
WO2010065170A1 (en) * 2008-08-20 2010-06-10 Manhattan Technologies Ltd. Multibeam doubly convergent electron gun
US8723137B1 (en) * 2012-10-17 2014-05-13 Innosys, Inc Hybrid magnet for vacuum electronic device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2812470A (en) * 1954-10-22 1957-11-05 Bell Telephone Labor Inc Periodic focusing in traveling wave tubes
US2911555A (en) * 1957-09-04 1959-11-03 Hughes Aircraft Co Traveling-wave tube
US3102211A (en) * 1959-08-19 1963-08-27 Varian Associates Adiabatic beam condenser method and apparatus
US3231780A (en) * 1960-10-14 1966-01-25 Sfd Lab Inc Meandering slow wave circuit having high impedance stub support means
US3504222A (en) * 1966-10-07 1970-03-31 Hitachi Ltd Slow-wave circuit including meander line and shielding therefor
US3610999A (en) * 1970-02-05 1971-10-05 Varian Associates Slow wave circuit and method of fabricating same
US3670196A (en) * 1971-02-24 1972-06-13 Raytheon Co Helix delay line for traveling wave devices
US3705327A (en) * 1971-06-02 1972-12-05 Allan W Scott Microwave generator with interleaved focusing and interaction structures

Also Published As

Publication number Publication date
DE2338061A1 (en) 1974-02-21
IL42696A0 (en) 1973-10-25
US3787747A (en) 1974-01-22
FR2195838A1 (en) 1974-03-08
JPS49124962A (en) 1974-11-29
IL42696A (en) 1976-02-29
FR2195838B1 (en) 1977-02-25
IT992766B (en) 1975-09-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee