Accession Number : AD0608218

Title :   CERENKOV MICROWAVE GENERATOR.

Descriptive Note : Final technical documentary rept. for Dec 63-Jul 64,

Corporate Author : RAYTHEON CO WALTHAM MASS

Personal Author(s) : Boornard,A. ; brumbaugh,J. M. ; Stekert,J. J. ; Zelby,L. W.

Report Date : OCT 1964

Pagination or Media Count : 74

Abstract : Measurements were made of the CW Cerenkov radiation generated by the interaction of a modulated ribbon electron beam with a dielectric reflection coupler. The coupler consists of two identical 1.27-cm wide slab sectors having an interaction length of 10cm. The dielectric coefficient of the coupler material is 15 at the beam modulation frequency of 6.33 Gc. Typical experimental parameters are: dc beam current, 0.30 ma; gun voltage plus potential well voltage, 70 kv; bunch rf power, 1.0 watt; and beam-to-dielectric separation, 0.16 cm. Separating the contribution of leakage radiation and resonance radiation from the detected power level gives 4.6 microwatts as the detected Cerenkov power for a typical experimental determination. The generatedto-detected power ratio is determined to be between 165 to 75. Using the calculated value of the beam current amplitude at 6.33 Gc yields 1,250 to 560 ohms/cm for the interaction resistance per unit length. The value of 1,250 ohms/cm is in good agreement with the interaction resistance predicted by the theory developed in previous work. (Author)

Descriptors :   (*CERENKOV RADIATION, GENERATORS), (*GENERATORS, CERENKOV RADIATION), RADIOFREQUENCY POWER, MICROWAVE EQUIPMENT, WAVEGUIDES, DIELECTRICS, MEASUREMENT, ELECTRON BEAMS, HARMONIC ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE