GB1392755A - Cathodes for electron guns - Google Patents

Cathodes for electron guns

Info

Publication number
GB1392755A
GB1392755A GB1899972A GB1899972A GB1392755A GB 1392755 A GB1392755 A GB 1392755A GB 1899972 A GB1899972 A GB 1899972A GB 1899972 A GB1899972 A GB 1899972A GB 1392755 A GB1392755 A GB 1392755A
Authority
GB
United Kingdom
Prior art keywords
pellet
housing
opening
machined
plug
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
GB1899972A
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Priority to GB1899972A priority Critical patent/GB1392755A/en
Publication of GB1392755A publication Critical patent/GB1392755A/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
    • H01J3/027—Construction of the gun or parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

Landscapes

  • Electron Sources, Ion Sources (AREA)

Abstract

1392755 Cathode constructions L'AIR LIQUIDE SOC ANON POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE 24 April 1972 18999/72 Heading H1D A cathode for an electron gun comprises a tube 1 housing an electron emissive pellet 17 and having an extension comprising a divergent conical opening 7. The inside of the housing and the surface of the opening are machined, the latter whilst the pellet is in the housing; a spherical surface 13 is also machined in the pellet. The pellet is retained by a plug 9 with bosses 14 or by an intermediate annular washer. The plug is welded or crimped in the housing and has an opening 10 to allow evacuation. The opening 7 and Wehnalt member 8 are aligned. The tube is of Ta, W or Re, the pellet of LaB 6 , Ta, W or Re or of porous material. The construction reduces beam misalignment particularly during initial heating.
GB1899972A 1972-04-24 1972-04-24 Cathodes for electron guns Expired GB1392755A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1899972A GB1392755A (en) 1972-04-24 1972-04-24 Cathodes for electron guns

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1899972A GB1392755A (en) 1972-04-24 1972-04-24 Cathodes for electron guns

Publications (1)

Publication Number Publication Date
GB1392755A true GB1392755A (en) 1975-04-30

Family

ID=10122050

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1899972A Expired GB1392755A (en) 1972-04-24 1972-04-24 Cathodes for electron guns

Country Status (1)

Country Link
GB (1) GB1392755A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2669771A1 (en) * 1990-11-27 1992-05-29 Thomson Tubes Electroniques IMPROVED CATHODE FOR MICROWAVE TUBES.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2669771A1 (en) * 1990-11-27 1992-05-29 Thomson Tubes Electroniques IMPROVED CATHODE FOR MICROWAVE TUBES.
EP0488852A1 (en) * 1990-11-27 1992-06-03 Thomson Tubes Electroniques Cathode for ultra high frequency tubes

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years