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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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Bent beam ionization gage linearity from calibrated nude Modulated Bayard-Alpert /MBA/ gage, discussing buried collector and tabulated magnetron gages
Thermionic converter operation with 112 to 114 oriented tungsten emitter and niobium collector with oxygen
Performance characteristics of parallel plane, variable spaced thermionic converter with tungsten emitter and molybdenum-niobium collector
Multistage depressed electrostatic collector for magnetically focused spaceborne klystrons
Analytic evaluation of depressed collector for linear beam microwave amplifiers
Mathematical model for depressed beam collector of traveling wave tube
Describing hot filament type Bayard-Alpert ionization gage with ion collector buried or removed from grid structure
Computational method for determining performance of ten stage electrostatic depressed collector for klystrons
Evaluation tests to demonstrate feasibility of increasing efficiency of linear beam microwave tubes using novel depressed collector
Methods for analyzing multistage electron beam collector schemes, with and without transverse magnetic fields, for traveling wave tubes
Numerical analysis of relationship between current, voltage, emitter temperature, and collector temperature of cesiated thermionic converter
Modified buried collector gauge performance over He pressure range, determining sensitivity dependence on filament geometry
Breakdown voltage and high power tests for pressure bonded collector sheath tubes with cracked alumina insulators and flowing liquid metal coolant
Klystron power conversion efficiency augmentation by electrostatic depressed collector design, presenting performance prediction calculation method
Depressed collector has basic configuration of a dish with a central cone and protruding spike. This geometry velocity sorts and slows the electrons down to minimum velocity at collection, and prevents backstreaming of secondaries and reflected primaries into interaction region of the tube.
The numerical calculation is described of the steady-state flow of electrons in an axisymmetric, spherical, electrostatic collector for a range of boundary conditions. The trajectory equations of motion are solved alternately with Poisson's equation for the potential field until convergence is achieved. A direct (noniterative) numerical technique is used to obtain the solution to Poisson's equation. Space charge effects are included for initial current densities as large as 100 A/sq cm. Ways of dealing successfully with the difficulties associated with these high densities are discussed. A description of the mathematical model, a discussion of numerical techniques, results from two typical runs, and the FORTRAN computer program are included.
Report compares efficiencies of 23 solar collectors for four different purposes: operating a Rankine-cycle engine, heating or absorption air conditioning, heating hot water, and heating a swimming pool.