• DocumentCode
    626057
  • Title

    Scandate cathode with sharp transition

  • Author

    Vancil, Bernard ; Schmidt, Volker ; Lorr, John ; Brodie, Ivor

  • Author_Institution
    E beam, Inc., Beaverton, OR, USA
  • fYear
    2013
  • fDate
    21-23 May 2013
  • Firstpage
    1
  • Lastpage
    2
  • Abstract
    We report on a new cathode which is based on die-pressed matrices made from scandia-doped tungsten powder. Transition temperatures from space charge to temperature limited emission are as low as 840° Cb(W) for emission of 5 Amps/cm2. Transitions are sharper than previously published scandate cathodes and compare favorably with M and ternary alloy cathodes. We present emission curves on several cathodes, show comparisons to other types of cathodes, and offer tentative explanations for the improvement. We discuss their suitability in microwave tubes at loadings of 5-10 Amps/cm2.
  • Keywords
    electron emission; microwave tubes; scandium; thermionic cathodes; tungsten; die-pressed matrices; emission curve; microwave tubes; scandate cathode; scandia-doped tungsten powder; sharp transition; space charge; temperature limited emission; transition temperature; Cathodes; Electron tubes; Powders; Resistance; Space charge; Tungsten; cathodes; dispenser; impregnated; scandate; thermionic;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International
  • Conference_Location
    Paris
  • Print_ISBN
    978-1-4673-5976-4
  • Type

    conf

  • DOI
    10.1109/IVEC.2013.6571037
  • Filename
    6571037
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=626057