Improved Cryogenic Capacitor for the ECCS: Larger Value (10 pF) and SI Measurement by Tuning the Calculable Capacitor
Neil M. Zimmerman, Mahmoud A. El-Sabbagh, Yicheng Wang
We report on several advances in the development of a cryogenic vacuum-gap capacitor Ccryo, for use with the electron-counting cpacitance standard (ECCS). First, we have increased the value by about a factor of ten, to 10pF; this will both make the ECCS more useful as a commercial standard, and also allows a substantial reduction in the relative uncertainty of the calibration of Ccryo. Second, the capacitor's stability is excellent, with a drift less than 10-9/hour. This stability is required for the third advance: we have succeeded in tuning the calculable capacitor, which allows us to make a measurement of Ccryo in SI units, without requiring a precise value of Ccryo. We demonstrate such a measurement, with an uncertainty of about 3 x 10-8.
IEEE Transactions on Instrumentation and Measurement
cryogenic vacuum-gap capacitor, tuning the calculable capacitor
, El-Sabbagh, M.
and Wang, Y.
Improved Cryogenic Capacitor for the ECCS: Larger Value (10 pF) and SI Measurement by Tuning the Calculable Capacitor, IEEE Transactions on Instrumentation and Measurement
(Accessed December 9, 2023)