Accession Number : ADA298878

Title :   Expert System for Control of Plasma, Beam and Wave Dynamics in Microwave Tubes.

Descriptive Note : Final rept.,

Corporate Author : LITTON SYSTEMS INC SAN CARLOS CA ELECTRON DEVICES DIV

Personal Author(s) : Bacher, H. ; Begum, R. ; Hargreaves, T. A. ; Rogers, R. ; Siambis, J.

PDF Url : ADA298878

Report Date : 20 JUL 1995

Pagination or Media Count : 204

Abstract : Three major subsystems were developed for a klystron expert system. These subsystems monitor and control the cathode temperature, the rf input response, and the rf output response. For the temperature controlled cathode subsystem, a Fortran code was developed to predict the steady state cathode temperature from transient heater voltage data. For the rf-input subsystem, a circuit having two simultaneously variable geometry adjustments was developed. This circuit symmetrizes the frequencies of and maintains the amplitude of the rf signal at the input cavity. A newly developed expert system software package successfully demonstrated adjustments of this circuit. A lumped element model of a two cavity extended interaction output cavity was developed and used to successfully predict the measurements on a two cavity cold test model. This circuit model is ready for use in a large signal two gap interaction code. A one gap large signal interaction code was written The code includes relativistic effects, velocity and density modulations, space charge effects, potential energy changes and dynamic beam loading.

Descriptors :   *EXPERT SYSTEMS, *MICROWAVE TUBES, *PLASMA CONTROL, COMPUTER PROGRAMS, INPUT, STEADY STATE, TRANSIENTS, MONITORING, VOLTAGE, FORTRAN, CATHODES, GEOMETRY, TEMPERATURE CONTROL, CHARGE DENSITY, POTENTIAL ENERGY, MODULATION, MACHINE CODING, SPACE CHARGE, CIRCUIT ANALYSIS, CAVITY RESONATORS, ELECTRICAL LOADS, RADIOFREQUENCY POWER, KLYSTRONS, PLASMA WAVES.

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE