GB1142645A - Electron guns having directly heated cathodes - Google Patents

Electron guns having directly heated cathodes

Info

Publication number
GB1142645A
GB1142645A GB2149366A GB2149366A GB1142645A GB 1142645 A GB1142645 A GB 1142645A GB 2149366 A GB2149366 A GB 2149366A GB 2149366 A GB2149366 A GB 2149366A GB 1142645 A GB1142645 A GB 1142645A
Authority
GB
United Kingdom
Prior art keywords
electron beam
shield
gun
directly heated
cathode
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
GB2149366A
Inventor
Peter Alex Einstein
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.)
Vickers Ltd
Original Assignee
Vickers 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 Vickers Ltd filed Critical Vickers Ltd
Priority to GB2149366A priority Critical patent/GB1142645A/en
Publication of GB1142645A publication Critical patent/GB1142645A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/026—Eliminating deleterious effects due to thermal effects, electric or magnetic field

Landscapes

  • Electron Sources, Ion Sources (AREA)

Abstract

1,142,645. Electron beam magnetic focusing system. VICKERS Ltd. 9 May, 1967 [13 May, 1966], No. 21493/66. Heading H1D. An electron gun, as used in electron beam welding for example, comprises a directly heated cathode 2 and an anode, the gun further comprising a shield 6 of magnetic material (of iron or mild steel of permeability 50 for example) formed with a passageway 5 of circular crosssection, the axis of which is the electron beam axis of the gun, the centre of the upstream end of the passageway being spaced downstream from the cathode by a distance not greater than the radius of said circular cross-section, whereby deflection of the electron beam by the magnetic field of the cathode current is reduced. Wehnett cylinder 3 may itself serve as the shield, if of magnetic material. Shield 6, electrode 3 and aperture 5 may be of 2cms., 9 cms., and 3 mms. diameter respectively.
GB2149366A 1966-05-13 1966-05-13 Electron guns having directly heated cathodes Expired GB1142645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2149366A GB1142645A (en) 1966-05-13 1966-05-13 Electron guns having directly heated cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2149366A GB1142645A (en) 1966-05-13 1966-05-13 Electron guns having directly heated cathodes

Publications (1)

Publication Number Publication Date
GB1142645A true GB1142645A (en) 1969-02-12

Family

ID=10163874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2149366A Expired GB1142645A (en) 1966-05-13 1966-05-13 Electron guns having directly heated cathodes

Country Status (1)

Country Link
GB (1) GB1142645A (en)

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