Accession Number : AD0801364

Title :   IMPROVED E-BAND EXTENDED-INTERACTION RESONATORS.

Descriptive Note : Semiannual rept. no. 1, Nov 65-May 66.

Corporate Author : VARIAN ASSOCIATES INC SAN CARLOS CA EIMAC DIV

Personal Author(s) : Lien, Erling ; Goldfinger, Arthur

Report Date : SEP 1966

Pagination or Media Count : 63

Abstract : The object of this program is to perform a theoretical and experimental investigation for improving the power handling capabilities of extended-interaction resonators. The effort is directed toward development of a resonator capable of operation at one megawatt of CW power at 8 Gigacycles. Included in this report is a theoretical investigation of power balance and gap voltage distribution in extended interaction resonators. The analysis is based upon an equivalent lumped circuit model of the resonator. The results indicate that the characteristic complex frequencies and gap voltage modes of the undriven loaded resonator give adequate information about the optimum operating frequency, bandwidth and gap voltage distribution of the resonator when it is driven by the beam. Resonators for super-power application must be made with the strongest possible internal coupling in order to obtain a uniform power dissipation within the resonator. Experiments have been conducted to determine surface finish degradation effects caused by high temperature brazing cycles. It has been found that high polished surfaces of commercially available OFHC copper can be maintained throughout the typical brazing cycles employed in vacuum tube production. The degradation of surface finishes of electroformed copper can be minimized by brazing in vacuum rather than hydrogen atmospheres. Experimental cavity tests conducted show considerable degradation of Q due to surface roughness. Reduced temperature, cavity Q measurements, show improvement in Q at low temperatures, but not of the magnitude expected. (Author)

Descriptors :   (*CAVITY RESONATORS, X BAND), RADIOFREQUENCY POWER, VOLTAGE, SURFACE PROPERTIES, DEGRADATION, BRAZING, COPPER.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE