Title :
Cryogen-free operation of programmable Josephson voltage standard with a closed-cycle refrigerator
Author :
Chong, Yonuk ; Kim, Mun-Seog ; Kim, Wan-Seop ; Kim, Kyu-Tae
Author_Institution :
Korea Res. Inst. of Stand. & Sci., Daejeon
Abstract :
We report operation of a programmable Josephson voltage standard on a closed-cycle refrigerator. NIST IV PJVS chip is used, and we operate the chip with the fingerboard that is adopted from the existing liquid helium dipping probe. We demonstrate operation at 5.5 K of chip temperature, with a flat Shapiro step in the sub-array of the chip.
Keywords :
Josephson effect; measurement standards; programmable circuits; refrigerators; superconducting junction devices; voltage measurement; closed-cycle refrigerator; cryogen-free operation; flat Shapiro step; liquid helium dipping probe; programmable Josephson voltage standard; temperature 5.5 K; Cooling; Critical current; Electromagnetic heating; Fluctuations; Helium; NIST; Refrigeration; Switches; Temperature dependence; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on
Conference_Location :
Broomfield, CO
Print_ISBN :
978-1-4244-2399-6
Electronic_ISBN :
978-1-4244-2400-9
DOI :
10.1109/CPEM.2008.4574915
