Dry cooling of a 10 V programmable Josephson voltage standard array
2016 Conference on Precision Electromagnetic Measurements (CPEM 2016)(2016)
摘要
This paper describes the properties of a 10 V programmable Josephson voltage standard (PJVS) array operated in a cryocooler. The operating margins at 70 GHz frequencies are discussed and compared to liquid helium cooling. A crucial factor is the limited heat conduction between PJVS chip and cold stage. A method is presented to estimate the heat conduction directly with the Josephson array. Finally, a direct comparison between two 10 V PJVS arrays, one operated in a cryocooler and the other cooled with liquid helium is performed and shows an agreement to a level of 1 part in 10
⁁
{−10}.
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关键词
AC Quantum Voltmeter,cooling,cryocooler,Josephson junctions,programmable Josephson voltage standard
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