Accession Number : AD0638477

Title :   THE REGENERATIVE CERENKOV MICROWAVE INTERACTION.

Descriptive Note : Final rept. Feb 65-May 66.

Corporate Author : RADIO CORP OF AMERICA CAMDEN N J DEFENSE ELECTRONIC PRODUCTS

Personal Author(s) : Boornard,A. ; Brumbaugh,J. M. ; Stekert,J. J.

Report Date : AUG 1966

Pagination or Media Count : 133

Abstract : The microwave power generated by the Cerenkov interaction between a density modulated electron beam and two different types of regenerative Cerenkov couplers is measured. One is a resonant coupler while the other is non-resonant traveling wave coupler. The couplers are composed of uniform dielectric bars of rectangular cross section and having a dielectric coefficient of 15 at the operating frequency of 6.24 GHz. Typical experimental parameters are: dc beam current, 0.43 to 0.45 mA; gun voltage plus potential well voltage, 72.3 kV; and beam-to-dielectric separation, 0.134 cm. For the resonant regenerative coupler the generated microwave power was between 5.1 and 6.1 milliwatts, yielding an interaction resistance per unit length of between 3,200 and 3,900 ohms/cm. This may be compared to the traveling wave Cerenkov coupler for which the generated power was 1.8 to 2.4 milliwatts leading to an interaction resistance per unit length of between 730 and 970 ohms/cm. The power generated by the resonator is calculated to be about 3.7 times greater than that of the traveling wave coupler which compares favorably with the measured value of between 2.1 and 3.4. A self-consistent field analysis of the regenerative Cerenkov interaction between a modulated electron beam and partially dielectric loaded cylindrical waveguide is performed. Comparison is made with, a) the results obtained from a Pierce analysis of the same structure, and b) the results of a Pierce analysis for a typical helix structure. (Author)

Descriptors :   (*MICROWAVE AMPLIFIERS, CERENKOV RADIATION), (*CERENKOV RADIATION, RADIOFREQUENCY POWER), MICROWAVES, ELECTRON TUBES, WAVEGUIDE COUPLERS, ELECTRON BEAMS, DIELECTRICS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE