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GB865725A - Improvements in or relating to magnetic focusing systems for travelling-wave tubes - Google Patents

Improvements in or relating to magnetic focusing systems for travelling-wave tubes

Info

Publication number
GB865725A
GB865725A GB22033/58A GB2203358A GB865725A GB 865725 A GB865725 A GB 865725A GB 22033/58 A GB22033/58 A GB 22033/58A GB 2203358 A GB2203358 A GB 2203358A GB 865725 A GB865725 A GB 865725A
Authority
GB
United Kingdom
Prior art keywords
rods
main
soft iron
travelling wave
field
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
GB22033/58A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB865725A publication Critical patent/GB865725A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microwave Tubes (AREA)
  • Particle Accelerators (AREA)

Abstract

865,725. Travelling wave tubes. PHILIPS ELECTRICAL INDUSTRIES Ltd. July 9, 1958 [July 11, 1957], No. 22033/58. Class 39(1). A travelling wave tube has a 'uniform field' magnetic focusing system comprising two apertured polygonal soft iron pole pieces 3, Fig. 4, to each of which is attached a main set of radially arranged permanent magnet rods 1 the rods of one main set being radially magnetised in the opposite radial direction to the rods of the other main set the outer ends of the rods being connected by soft iron rod members 4 and an additional set 5 (2 sets shown) of radially arranged and radially magnetised permanent magnet steel rods adjacent one of the two main sets the outer ends of the rods of the additional set being disposed against the soft iron members 4 and the inner ends being free the field strength and direction of magnetisation of the rods of the additional set being such as to inhibit along at least part of the system variations in the strength of the axial magnetic field. To make the field larger at the output end of the travelling wave tube the main magnets at that end are made slightly longer and thicker than those at the input end, Fig. 5 (not shown). A pile of hard paper and mumetal rings 6, 7 may form a composite tube serving approximately the function of a flux guide. The input and output waveguides extend between the composite tube and the pole pieces.
GB22033/58A 1957-07-11 1958-07-09 Improvements in or relating to magnetic focusing systems for travelling-wave tubes Expired GB865725A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL218874 1957-07-11

Publications (1)

Publication Number Publication Date
GB865725A true GB865725A (en) 1961-04-19

Family

ID=19750926

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22033/58A Expired GB865725A (en) 1957-07-11 1958-07-09 Improvements in or relating to magnetic focusing systems for travelling-wave tubes

Country Status (6)

Country Link
US (1) US2956193A (en)
CH (1) CH362758A (en)
DE (1) DE1112790B (en)
FR (1) FR1211420A (en)
GB (1) GB865725A (en)
NL (2) NL107303C (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183398A (en) * 1960-08-04 1965-05-11 Raytheon Co Beam focusing magnet
US3164742A (en) * 1960-12-27 1965-01-05 Gen Electric High frequency energy interchange device
NL277862A (en) * 1961-05-02
NL298777A (en) * 1962-10-04 1900-01-01
US3283200A (en) * 1963-12-12 1966-11-01 Varian Associates High frequency electron discharge device having improved permanent magnetic focusing
DE1491426A1 (en) * 1964-08-12 1969-05-22 Siemens Ag Permanent magnet system for the bundled guidance of an electrode beam over a longer distance, especially for traveling field tubes
DE1491444B2 (en) * 1965-01-26 1972-04-06 Siemens AG, 1000 Berlin u 8000 München PERMANENT MAGNET SYSTEM FOR GENERATING A SIGNIFICANTLY HOMOGENOUS MAGNETIC FIELD FOR CONCENTRATED GUIDANCE OF AN ELECTRON BEAM OVER A LONGER DISTANCE, IN PARTICULAR FOR WALKING FIELD TUBES
US3349354A (en) * 1965-06-02 1967-10-24 Miyata Saburo Means for imposing electric and magnetic fields on flowing fluids
US3896329A (en) * 1972-09-21 1975-07-22 Varian Associates Permanent magnet beam focus structure for linear beam tubes
US5744910A (en) * 1993-04-02 1998-04-28 Litton Systems, Inc. Periodic permanent magnet focusing system for electron beam

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825840A (en) * 1953-01-29 1958-03-04 Itt Traveling wave electron discharge devices
GB748946A (en) * 1953-03-26 1956-05-16 Standard Telephones Cables Ltd Improvements in or relating to travelling wave apparatus
US2844754A (en) * 1953-04-29 1958-07-22 Bell Telephone Labor Inc Electron beam focusing system
DE1098625B (en) * 1953-11-13 1961-02-02 Siemens Ag Magnetic bundling system for bundled guidance of one (several) electron flow (s) by means of a homogeneous magnetic field along a larger distance, especially for traveling wave tubes
NL200488A (en) * 1954-09-22
NL214979A (en) * 1956-03-01

Also Published As

Publication number Publication date
CH362758A (en) 1962-06-30
US2956193A (en) 1960-10-11
FR1211420A (en) 1960-03-16
NL107303C (en)
DE1112790B (en) 1961-08-17
NL218874A (en)

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