Title :
A tunable vacuum-gap cryogenic coaxial capacitor
Author :
Overney, Frédéric ; Jeanneret, Blaise ; Furlan, Miha
Author_Institution :
Swiss Federal Office of Metrol., Bern, Switzerland
fDate :
12/1/2000 12:00:00 AM
Abstract :
In order to realize a quantum capacitance standard, a vacuum-gap cryogenic capacitor based on a coaxial design has been developed. A tuning mechanism allows adjustment of the room temperature value of the capacitance to obtain the value of 1 pF at cryogenic temperature. At 10 mK, the difference between the measured value and the target value is less than 30×10-6. In this paper, the capacitor and its tuning mechanism are described in detail. The variation of the capacitance during the vacuum and temperature cycles and its stability at 10 mK are also investigated
Keywords :
capacitance measurement; capacitors; electrometers; measurement standards; quantum interference devices; tuning; 1 pF; 10 mK; coaxial design; low temperature stability; mechanical stability; quantum capacitance standard; single electron tunnelling; temperature cycles; tuning mechanism; vacuum cycles; vacuum-gap cryogenic capacitor; Bridge circuits; Capacitors; Coaxial components; Cryogenics; Electrons; Elementary particle vacuum; Quantum capacitance; Stability; Standards development; Temperature;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
