Abstract
A series-array voltage standard containing 2,076 Josephson junctions has been operated in a liquid helium bath maintained within a refrigerated Dewar over the temperature range 1.56K ≤ T ≤ 4.54K. No systematic variation in the array voltage near 1.018V with temperature was detected over this entire range, indicating that any temperature coefficient of the array voltage must be less than 2×10-8 V/K. The critical current and gap energy of the weakest junction within the array in the absence of millimeter wave power were measured as a function of temperature over this same range. The noise sensitivity of the array was observed to change abruptly but by a small amount as the helium bath was pumped superfluid. Voltage calibrations were unaffected by the bath's superfluid transition.
Original language | English |
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Pages (from-to) | 101-102 |
Number of pages | 2 |
Journal | Physica B: Physics of Condensed Matter |
Volume | 165-166 |
Issue number | PART 1 |
DOIs | |
State | Published - Aug 1990 |