TITLE

In situ measurement of the permittivity of helium using microwave NbN resonators

AUTHOR(S)
Grabovskij, G. J.; Swenson, L. J.; Buisson, O.; Hoffmann, C.; Monfardini, A.; Villégier, J.-C.
PUB. DATE
September 2008
SOURCE
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p134102
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
By measuring the electrical transport properties of superconducting NbN quarter-wave resonators in direct contact with a helium bath, we have demonstrated a high-speed and spatially sensitive sensor for the permittivity of helium. In our implementation an ∼10-3 mm3 sensing volume is measured with a bandwidth of 300 kHz in the temperature range of 1.8–8.8 K. The minimum detectable change in the permittivity of helium is calculated to be ∼6×10-11 ε0/Hz1/2 with a sensitivity of the order of 10-13 ε0/Hz1/2 easily achievable. Potential applications include operation as a fast, localized helium thermometer and as a transducer in superfluid hydrodynamic experiments.
ACCESSION #
34771846

 

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