DocumentCode
3556260
Title
An improved dispenser cathode
Author
Sakurai, T. ; Sato, K. ; Kimura, C.
Author_Institution
New Japan Radio Co., Ltd.
Volume
30
fYear
1984
fDate
1984
Firstpage
322
Lastpage
325
Abstract
Electron emissivity of tungsten dispenser cathode has been remarkably increased only by improving the process technology. Improved process includes firing impregnants in an oxidizing atmosphere which contains CO2 and finishing the emitting area clean by new \´physical and chemical\´ treantemts. The application of this process to the Ir coated dispenser cathode leads to electron emissivity of 39A/cm2(pulsed FSCL) at cathode temperature 1050°CB . Measured Richardson parameters 
are 1 .06 eV and 0.155 A/cm2deg2, respectively. At the same time, the short acivation time and low evaporation are given by this process. Cathodes of this type are most suitable for high resolution camera tubes and microwave tubes.
are 1 .06 eV and 0.155 A/cm2deg2, respectively. At the same time, the short acivation time and low evaporation are given by this process. Cathodes of this type are most suitable for high resolution camera tubes and microwave tubes.Keywords
Atmosphere; Cameras; Cathodes; Chemical processes; Chemical technology; Electrons; Finishing; Power capacitors; Temperature; Tungsten;
fLanguage
English
Publisher
ieee
Conference_Titel
Electron Devices Meeting, 1984 International
Type
conf
DOI
10.1109/IEDM.1984.190713
Filename
1484484
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