Comment on the mechanism of operation of the impregnated tungsten cathode
Journal Article
·
· J. Appl. Phys.; (United States)
Recent life-test measurements, over 20 000--30 000 h, on impregnated tungsten cathodes in tubes employing an open-type electron-gun structure, show emission current degradation with time. This is in contrast to those recently published by Rittner on B-type cathodes, run in close-spaced diodes, taken some years ago. These more recent life-test results are consistent with the model suggested by Forman and disputed by Rittner that the barium coverage on an impregnated cathode is less than a monolayer for most of its life and decreases with time.
- Research Organization:
- National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135
- OSTI ID:
- 6364608
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:3; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
30 DIRECT ENERGY CONVERSION
300402* -- Thermionic Converters-- Performance & Testing
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
ALKALINE EARTH METALS
BARIUM
CATHODES
CURRENTS
DATA
DATA FORMS
ELECTRIC CURRENTS
ELECTRODES
ELECTRON TUBES
ELEMENTS
EMISSION
EXPERIMENTAL DATA
IMPREGNATION
INFORMATION
ISOLATED VALUES
LIFETIME
METALS
NESDPS Office of Nuclear Energy Space and Defense Power Systems
NUMERICAL DATA
OPERATION
PERFORMANCE
REFRACTORY METALS
SURFACES
THERMIONIC EMISSION
THERMIONIC TUBES
TRANSITION ELEMENTS
TUNGSTEN
300402* -- Thermionic Converters-- Performance & Testing
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
ALKALINE EARTH METALS
BARIUM
CATHODES
CURRENTS
DATA
DATA FORMS
ELECTRIC CURRENTS
ELECTRODES
ELECTRON TUBES
ELEMENTS
EMISSION
EXPERIMENTAL DATA
IMPREGNATION
INFORMATION
ISOLATED VALUES
LIFETIME
METALS
NESDPS Office of Nuclear Energy Space and Defense Power Systems
NUMERICAL DATA
OPERATION
PERFORMANCE
REFRACTORY METALS
SURFACES
THERMIONIC EMISSION
THERMIONIC TUBES
TRANSITION ELEMENTS
TUNGSTEN