GB1403172A - Miniaturized microwave beam tube - Google Patents

Miniaturized microwave beam tube

Info

Publication number
GB1403172A
GB1403172A GB1307273A GB1307273A GB1403172A GB 1403172 A GB1403172 A GB 1403172A GB 1307273 A GB1307273 A GB 1307273A GB 1307273 A GB1307273 A GB 1307273A GB 1403172 A GB1403172 A GB 1403172A
Authority
GB
United Kingdom
Prior art keywords
tube
travelling
march
excess
rare earth
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
GB1307273A
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
Priority claimed from US236299A external-priority patent/US3886194A/en
Application filed by Varian Associates Inc filed Critical Varian Associates Inc
Publication of GB1403172A publication Critical patent/GB1403172A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

1403172 Velocity-modulated tubes VARIAN ASSOCIATES 19 March 1973 [20 March 1972] 13072/73 Heading H1D A miniturized microwave beam tube, e.g. a travelling-wave tube or klystron, for operation at a frequency above 4 GHz, includes an electron gun providing a beam of a microperveance within the range of 0À8 to 2À2, and a periodic permanent magnet focussing system which includes axially polarized annular magnets having a coercive force in excess of 2000 oersteds, and which produces a focussing field within the beam path of an intensity in excess of 2000 gauss. As described, the envelope of a travelling-wave tube if formed by a brazed sequence of annular iron pole plates 11 and non- magnetic spacers 13, the annular magnets 9 being formed as two half rings to facilitate assembly, and being composed of a rare earth/ cobalt material where the rare earth may be Y, Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Eb, Dy, Ho, Er, Tm, Yb or Lu. The gun has a cathode-preferably of dispenser type-with at part-spherical concave surface, and a modulating anode (16, Fig. 7, not shown). The tube may have an overall size of 0À35 by 0À75 by 5À0 inch. Many numerical data are provided.
GB1307273A 1972-03-20 1973-03-19 Miniaturized microwave beam tube Expired GB1403172A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US236299A US3886194A (en) 1969-05-21 1972-03-20 N-phenoxyalkyl-L-thiocyanoalkanamides

Publications (1)

Publication Number Publication Date
GB1403172A true GB1403172A (en) 1975-08-28

Family

ID=22888948

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1307273A Expired GB1403172A (en) 1972-03-20 1973-03-19 Miniaturized microwave beam tube

Country Status (4)

Country Link
US (1) US3755706A (en)
JP (1) JPS577461B2 (en)
FR (1) FR2176932B1 (en)
GB (1) GB1403172A (en)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1451956A (en) * 1973-02-16 1976-10-06 English Electric Valve Co Ltd Travelling wave tubes
US3855498A (en) * 1973-11-01 1974-12-17 Us Navy Center-pole magnetic circuit
US3881127A (en) * 1973-11-01 1975-04-29 Us Navy Bucking samarium cobalt magnets for crossed field devices
US3958147A (en) * 1975-06-06 1976-05-18 Hughes Aircraft Company Traveling-wave tube with improved periodic permanent magnet focusing arrangement integrated with coupled cavity slow-wave structure
US4114532A (en) * 1976-10-12 1978-09-19 Dataproducts Corporation Impact printer magnet assembly
JPS5631812Y2 (en) * 1976-10-25 1981-07-29
US4228416A (en) * 1978-09-15 1980-10-14 Hov-Air-Ship, Inc. Composite magnet and magnetic anchoring
JPS57127674A (en) * 1981-01-29 1982-08-07 Disco Abrasive Sys Ltd Internal peripheral blade edge manufacturing method
JPS57138577A (en) * 1981-02-17 1982-08-26 Goei Seisakusho:Kk Electroformed cutter and manufacture thereof
DE3216250C2 (en) * 1982-04-30 1985-04-25 Siemens AG, 1000 Berlin und 8000 München Traveling wave tube with periodic permanent magnetic focusing system
JPS59192461A (en) * 1983-04-13 1984-10-31 Disco Abrasive Sys Ltd Tubular boring grindstone and manufacture
FR2545645B1 (en) * 1983-05-03 1985-12-13 Thomson Csf METHOD FOR MANUFACTURING A SOCKET OF A SHEATH SAID WITH INCORPORATED POLAR PIECES FOR MICROWAVE TUBES
US5332948A (en) * 1992-05-13 1994-07-26 Litton Systems, Inc. X-z geometry periodic permanent magnet focusing system
US5332947A (en) * 1992-05-13 1994-07-26 Litton Systems, Inc. Integral polepiece RF amplification tube for millimeter wave frequencies
US5744910A (en) * 1993-04-02 1998-04-28 Litton Systems, Inc. Periodic permanent magnet focusing system for electron beam
US5932971A (en) * 1997-06-05 1999-08-03 Hughes Electronics Corp Optimally designed traveling wave tube for operation backed off from saturation
NL1026006C2 (en) 2004-04-22 2005-10-25 Fei Co Particle-optical device provided with lenses with permanent magnetic material.
CN101461026B (en) * 2006-06-07 2012-01-18 Fei公司 Slider bearing for use with an apparatus comprising a vacuum chamber
US8258725B2 (en) * 2008-04-03 2012-09-04 Patrick Ferguson Hollow beam electron gun for use in a klystron
US8662187B2 (en) * 2009-08-13 2014-03-04 Baker Hughes Incorporated Permanent magnet linear motor actuated safety valve and method
WO2011056657A2 (en) 2009-10-27 2011-05-12 Harmonix Music Systems, Inc. Gesture-based user interface
JP5835822B1 (en) * 2014-06-30 2015-12-24 Ｎｅｃネットワーク・センサ株式会社 High frequency circuit system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB785110A (en) * 1955-06-28 1957-10-23 Standard Telephones Cables Ltd Electron tube magnetic focusing device
US3215906A (en) * 1963-09-24 1965-11-02 D M Steward Mfg Company Periodic permanent magnet focusing stack
US3398315A (en) * 1965-08-19 1968-08-20 Westinghouse Electric Corp A traveling wavetube with improved thermal and magnetic circuitry
FR1522411A (en) * 1967-03-14 1968-04-26 Csf Compensation for the effects of temperature in magnetic focusers

Also Published As

Publication number Publication date
JPS577461B2 (en) 1982-02-10
FR2176932B1 (en) 1977-08-05
FR2176932A1 (en) 1973-11-02
US3755706A (en) 1973-08-28
JPS496874A (en) 1974-01-22

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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
PE20 Patent expired after termination of 20 years

Effective date: 19930318