What question did this study set out to answer?

This research aims to understand the effects of rf voltage on the behavior of Josephson junctions when coupled to resonant cavities.

December 10, 1967

Analog-Computer Studies of Josephson Radiation Effects

Key Points

This research aims to understand the effects of rf voltage on the behavior of Josephson junctions when coupled to resonant cavities.
Equations of a Josephson junction and resonant cavity programmed into an electronic analog computer.
Analysis of dc V-I characteristics and power spectrum adjustments under varying parameters such as resonance frequency and rf voltage amplitude.
Observations made for both constant-voltage and constant-current load lines.
Modifications in dc V-I characteristics observed with varying resonance frequency and Q of the cavity.
Changes in power spectrum linked to frequency and amplitude of rf voltage applied to the junction.
Nonlinear responses understood through a single frequency component approximation of the cavity electric field.

Abstract

Equations characterizing a Josephson junction coupled to a resonant cavity driven by an rf voltage have been programmed for an electronic analog computer. Modifications in the dc V-I characteristic of the junction, for both constant-voltage and constant-current load lines, as well as the power spectrum in the cavity, were observed as a function of the parameters: resonance frequency and Q of the cavity, frequency and amplitude of the applied rf voltage, and strength of coupling between junction and cavity. Many of the nonlinear, parametric effects observed can also be understood analytically on the basis of the approximation that the cavity electric field contains only a single frequency component.

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Analog-Computer Studies of Josephson Radiation Effects

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