Accession Number : AD0749986

Title :   Superconducting Microwave Cavities and Josephson Junctions.

Descriptive Note : Technical rept.,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF PHYSICS

Personal Author(s) : Smith,Todd I.

Report Date : 31 MAR 1972

Pagination or Media Count : 23

Abstract : The possibility of using very high Q superconducting microwave cavities to obtain a strong coupling between the electromagnetic field and a Josephson junction has prompted a study of such systems. Expressions have been obtained describing the dc I-V characteristic of a junction biased so that the Josephson radiation frequency is near a resonance of the cavity in which it is located. The rf power coupled into an X-band (10 GHZ) TE(011) mode cavity from a weakly coupled junction is approximately 3 x 10 to the-13th power (I sub 0) squared Q watts, where I sub 0 is the critical current of the junction and Q is the cavity Q. When the coupling between the junction and cavity is large enough, the I-V characteristic becomes multiple valued and the power coupled to the cavity depends on the state of the system. The maximum power which can be coupled to the cavity is approximately 0.58 I sub 0 V(dc), where V(dc) is the voltage required to bias the junction to the resonant frequency of the cavity. (Author)

Descriptors :   (*SUPERCONDUCTORS, MICROWAVE OSCILLATORS), SUPERCONDUCTIVITY, X BAND, IMPEDANCE MATCHING

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE