A dry-cooled AC quantum voltmeter. (15th September 2016)

• Record Type: Journal Article
• Authors: Schubert, M; Starkloff, M; Peiselt, K; Anders, S; Knipper, R; Lee, J; Behr, R; Palafox, L; Böck, A C; Schaidhammer, L; Fleischmann, P M; Meyer, H-G
• Is Part Of: Superconductor science & technology. Volume 29:Number 10(2016:Oct.)
• Publication Date: 2016-09-15
• Subjects: Josephson voltage standard -- Josephson junction -- cryocooler -- AC quantum voltmeter -- ac voltage -- programmable Josephson voltage standard -- PJVS; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/29/10/105014
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: The paper describes a dry-cooled AC quantum voltmeter system operated up to kilohertz frequencies and 7 V rms. A 10 V programmable Josephson voltage standard (PJVS) array was installed on a pulse tube cooler (PTC) driven with a 4 kW air-cooled compressor. The operating margins at 70 GHz frequencies were investigated in detail and found to exceed 1 mA Shapiro step width. A key factor for the successful chip operation was the low on-chip power consumption of 65 mW in total. A thermal interface between PJVS chip and PTC cold stage was used to avoid a significant chip overheating. By installing the cryocooled PJVS array into an AC quantum voltmeter setup, several calibration measurements of dc standards and calibrator ac voltages up to 2 kHz frequencies were carried out to demonstrate the full functionality. The results are discussed and compared to systems with standard liquid helium cooling. For dc voltages, a direct comparison measurement between the dry-cooled AC quantum voltmeter and a liquid-helium based 10 V PJVS shows an agreement better than 1 part in 10 10 .