[go: up one dir, main page]

GB792020A - Improvements in or relating to the magnetic focusing of electron beams - Google Patents

Improvements in or relating to the magnetic focusing of electron beams

Info

Publication number
GB792020A
GB792020A GB27902/55A GB2790255A GB792020A GB 792020 A GB792020 A GB 792020A GB 27902/55 A GB27902/55 A GB 27902/55A GB 2790255 A GB2790255 A GB 2790255A GB 792020 A GB792020 A GB 792020A
Authority
GB
United Kingdom
Prior art keywords
relating
electron beam
arrangement
electron beams
spacing members
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
GB27902/55A
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 GB792020A publication Critical patent/GB792020A/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)
  • Particle Accelerators (AREA)

Abstract

792,020. Electron beam focussing apparatus. STANDARD TELEPHONES & CABLES, Ltd. Sept. 30, 1955 [Oct. 4, 1954], No. 27902/55. Class 39(1). An arrangement for focusing an electron beam, e.g., in a travelling wave tube, consists of an assembly of alternate permanent magnets 2 and spacing members 3 of material of high magnetic permeability and a system of by-pass, magnetic elements 6 adjustable in axial position between the spacing members to attain more closely a desired axial flux distribution. A sleeve 4 of non-magnetic material, such as brass. may be provided with grooves 5 with screwthreaded surfaces on which the by-pass elements 6 in the form of rings can be rotated. The arrangement may be used to provide a uniform field, or a field with a periodic reversal of flux along the axis.
GB27902/55A 1954-10-04 1955-09-30 Improvements in or relating to the magnetic focusing of electron beams Expired GB792020A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP336511X 1954-10-04

Publications (1)

Publication Number Publication Date
GB792020A true GB792020A (en) 1958-03-19

Family

ID=12392336

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27902/55A Expired GB792020A (en) 1954-10-04 1955-09-30 Improvements in or relating to the magnetic focusing of electron beams

Country Status (5)

Country Link
US (1) US2895066A (en)
CH (1) CH336511A (en)
DE (1) DE1057244B (en)
GB (1) GB792020A (en)
NL (1) NL200862A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL237015A (en) * 1958-03-12
US3106659A (en) * 1959-03-24 1963-10-08 Kearfott Company Inc Microwave tube construction
US3061754A (en) * 1960-03-18 1962-10-30 Gen Precision Inc Temperature compensating element for a traveling wave tube periodic array
US3178602A (en) * 1960-12-30 1965-04-13 Gen Precision Inc Adjustable permanent magnet focusing array

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE424327A (en) * 1936-10-30
GB504802A (en) * 1937-11-01 1939-05-01 Frederick Hermes Nicoll Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields
US2442975A (en) * 1943-08-31 1948-06-08 Rca Corp Focusing system
US2431077A (en) * 1943-08-31 1947-11-18 Rca Corp Cathode-ray tube with revolving magnets and adjustable sleeve
BE521065A (en) * 1952-07-01
US2741718A (en) * 1953-03-10 1956-04-10 Sperry Rand Corp High frequency apparatus
US2797360A (en) * 1953-03-26 1957-06-25 Int Standard Electric Corp Travelling wave amplifiers
US2812470A (en) * 1954-10-22 1957-11-05 Bell Telephone Labor Inc Periodic focusing in traveling wave tubes
US2790920A (en) * 1955-05-09 1957-04-30 Philco Corp Apparatus for control of electron beam cross section

Also Published As

Publication number Publication date
US2895066A (en) 1959-07-14
CH336511A (en) 1959-02-28
NL200862A (en)
DE1057244B (en) 1959-05-14

Similar Documents

Publication Publication Date Title
GB995269A (en) Permanent magnet device
GB810267A (en) Focusing magnet for long electron beams
GB792020A (en) Improvements in or relating to the magnetic focusing of electron beams
GB786988A (en) Improvements in or relating to electron tube arrangements including magnetic focussing systems
GB2022359A (en) Geophone with shaped magnetic field
GB850527A (en) Improvements in and relating to magnetic means for deflecting electron beams
GB739068A (en) Improvements in or relating to cathode ray tube arrangements
GB865725A (en) Improvements in or relating to magnetic focusing systems for travelling-wave tubes
GB875979A (en) Improvements in or relating to means for positioning electron beams in electron discharge devices
GB834958A (en) Improvements in or relating to magnetic focusing systems for travelling wave tubes
GB980119A (en) Periodic magnetic focusing arrangements for electron beam tubes
GB987024A (en) A magnetic focussing device for an electron tube
GB835271A (en) Periodic magnetic electron beam focusing arrangement
GB940055A (en) Permanent magnet electron-beam focussing arrangements
GB929793A (en) Magnetic focussing device
GB1031844A (en) Magnetic focusing device for an electron tube
GB890843A (en) Electron tube magnetic focussing device
GB1102327A (en) Improvements in or relating to magnetic electron lens assemblies
GB1143312A (en) Improvements in or relating to electron beam magnetic focussing systems
GB783603A (en) Improvements in or relating to magnet arrangements
GB834540A (en) Improvements relating to the irradiation of substances by electronic bombardment
GB1143311A (en) Improvements in or relating to electron beam magnetic focussing systems
GB834542A (en) Improvements in or relating to a cathode ray tube arrangement
GB836770A (en) Magnetic focusing assembly
GB1102173A (en) Improvements in or relating to electron beam periodic magnet focussing arrangements