Investigating the Use of Super Conducting Josephson Circuits for Microwave Power Measurements at Cryogenic Temperatures

In this paper, the use of Josephson Arbitrary Waveform Synthesizer System's superconducting integrated circuit consisting of two Josephson Junctions arrays, for microwave power measurements is investigated. The critical current, the temperature dependent phenomena of the Josephson Junctions, is used to compare DC power and MW power reaching the neighbor array. Validation of the method is roughly demonstrated by measuring the attenuation of the waveguide used within the stick used to immerse the circuit to cryogenic environment. The attenuation of the waveguide is measured with the novel sensor and the conventional method. The preliminary results show 0.2 dB consistence of the attenuation measurements between the conventional and the novel method at different power levels at 1 GHz, that suggest that the method can be useful. To improve the repeatability and accuracy by automation, which is essential for such measurements, new power sensor is designed and presented.