Phase boundary detection for dilution refrigerators

Journal Article · Wed Sep 01 00:00:00 EDT 2004 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1784568· OSTI ID:20643982

Haar, E ter; Martin, R V ^[1]

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1. DFMT, Instituto de Fisica, Universidade de Sao Paulo, C.P. 66.318, 05315-970 Sao Paulo, SP (Brazil)

We describe a device to conveniently measure the positions of the phase boundaries in a dilution refrigerator. We show how a simple modification of a standard capacitive level gauge (segmentation of one of the electrodes) permits a direct calibration of the capacitance versus phase boundary position. We compare this direct calibration with the indirect procedure that must be adopted for a conventional capacitive level gauge. The device facilitates the correct adjustment of the {sup 3}He/{sup 4}He fraction in the dilution refrigerator.

• OSTI ID: 20643982
• Journal Information: Review of Scientific Instruments, Vol. 75, Issue 9; Other Information: DOI: 10.1063/1.1784568; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CALIBRATION
CAPACITANCE
CAPACITORS
CRYOGENICS
DILUTION
ELECTRODES
HELIUM
HELIUM 3
HELIUM 4
LICENSES
REFRIGERATORS
VACUUM GAGES