Accession Number : ADA183389

Title :   Theory of Cross Field Devices and a Comparative Study of Other Radiation Sources.

Descriptive Note : Memorandum rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Lau,Y Y

PDF Url : ADA183389

Report Date : 21 Jul 1987

Pagination or Media Count : 71

Abstract : This paper gives an elementary exposition of the theory of cross field microwave devices. It provides an examination of the interaction mechanism in the light of the more modern radiation sources such as orbitron, gyrotron, peniotron and gyomagnetron. The operating conditions of magnetrons will be described, together with a qualitative description of the physical processes by which the energy of the electrons is transferred to the rf. These processes involve an interplay of the streaming motion and transverse migration of the electrons in DC electric and magnetic fields, and phase focusing provided by the rf fields of the corrugated walls. The essential features of the interaction mechanism can be quantified by the use of a sheet beam model and the various radiation sources are then characterized by a single dimensionless parameter (h), which is proportional to the equilibrium electric field experienced by the sheet beam. The wall corrugation enters only in the admittance in the theory of beam-wave interaction. A small signal theory is developed from first principle for general values of h. The decisive dependence of the stability on the equilibrium type (h) is described in detail. While the validity of the simple theory has been ascertained by various vigorous tests, several important features remain to be tested in laboratory experiments. These, together with other outstanding issues, will be addressed.

Descriptors :   ADMITTANCE, BEAMS(RADIATION), CORRUGATING, CROSSED FIELD DEVICES, DIRECT CURRENT, ELECTRIC FIELDS, ELECTRONS, ENERGY, EQUILIBRIUM(GENERAL), FIELD EQUIPMENT, FOCUSING, INTERACTIONS, LABORATORY TESTS, MAGNETIC FIELDS, MAGNETRONS, MICROWAVE EQUIPMENT, MIGRATION, MODELS, MOTION, RADIATION, RADIOFREQUENCY, SHEETS, SIGNALS, SOURCES, THEORY, TRANSVERSE, WALLS, WAVES

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE