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AIP Conf. Proc. / Volume 850 / Issue 1

Calibration Technique for Superfluid ⁴He Weak-Link Cells Based on the Fountain Effect

AIP Conf. Proc. -- September 7, 2006 -- Volume 850, pp. 119-120
LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24; doi:10.1063/1.2354631

Issue Date: 7 September 2006

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ABSTRACT

E. Hoskinson and R. E. Packard
Department of Physics, University of California, Berkeley, CA 94720

Studiesof superfluid ⁴He weak-links require calibration constants which permit thedetermination of the pressure and temperature differences which drive Josephsonoscillations. We describe a technique for calibrating ⁴He weak-link cellsin which a heater is used to induce fountain pressuresdetected by the deflection of a diaphragm. The technique determinesthe diaphragm spring constant, the inner cell volume, and thethermal conductance of the inner cells walls. This information isused to convert the measured deflection of the diaphragm intothe total chemical potential difference across the weak link. ©2006American Institute of Physics

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