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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Computer analysis of performance of chemically vapor-deposited tungsten, niobium thermionic converter based on temperatures of emitter, collector and cesium reservoir
Design and evaluation of cylindrical out-of-pile thermionic converter test vehicle to determine performance of tungsten emitters with preferred crystal orientation
Comparison of performance data envelopes for thermionic diodes with various tungsten or rhenium emitters and niobium or molybdenum collectors
Cesiated work functions of directed monocrystalline Re thermionic emitter from saturated electron emission currents over temperature range
High work function stable faceted W thermionic emitter surface preparation by electroetching and vapor deposition
Electron emission formulation for cesiated metal surfaces in thermionic converter in terms of work function, using Swanson-Strayer correlation
Long term stability and post test analysis of vapor deposited W emitters in high performance cylindrical thermionic converters
Thermionic converter electron-cesium atom momentum transfer collision probability, considering scattering cross sections
Cs vapor filled cracks breakdown in thermionic trilayer insulators, calculating electron reflection and ion recombination kinetics on surfaces
Cs plasma thermionic diode, using Penning effect for ionization rate increase via Hg or Cd seeding
Bimetallic refractory metal joints electron beam welding and aging for applications to in-pile thermionic converters
Electron beam welding of tungsten to tungsten/rhenium and tungsten/rhenium to niobium, discussing techniques for assembly of thermionic converter fuel elements
Out-of-core thermionic converter system using heat pipes as electrical resistive elements, discussing design and performance
Chemically vapor deposited deep etched tungsten emitter for high performance cylindrical thermionic converter
Heat rejection radiator influence on space nuclear power system as function of mass/area for Brayton, Rankine, thermoelectric and thermionic conversion schemes
Nuclear space power systems computer simulation for preliminary system and mission analysis, considering Brayton, Rankine and thermionic systems
Computer acquired I-V characteristics of thermionic fixed spaced planar diodes
Performance data from an etched-rhenium, molybdenum thermionic converter are presented. The planar converter has a guard-ringed collector and a fixed spacing of 0.254 mm (10 mils). The data were acquired by using a computer and are available on microfiche as individual or composite parametric current, voltage curves. The parameters are the temperatures of the emitter T sub E, collector T sub C and cesium reservoir T sub R. The composite plots have constant T sub E, and varying T sub C or T sub R, or both. The envelope and composite plots having constant I sub E are presented. The diode was tested at increments between 1500 and 2000 K for the emitter, 750 and 1100 K for the collector, and 540 and 640 K for the reservoir. In all, 774 individual current, voltage curves were obtained.