Low temperature thermal resistance for a new design of silver sinter heat exchanger

J. Pollanen*, H. Choi, J. P. Davis, B. T. Rolfs, W. P. Halperin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We have developed a novel procedure for constructing high surface area silver sinter heat exchangers. Our recipe incorporates nylon fibers having a diameter of ∼50 μm and thin wires of bulk silver in the heat exchanger. In order to increase the thermal conductance of liquid helium within the heat exchanger, prior to sintering, the nylon fibers are dissolved with an organic acid leaving a network of channels. In addition, the silver wires reinforce the structural integrity, and reduce the resistance, of the silver sinter. We have constructed a 3He melting curve thermometer (MCT) with this type of heat exchanger and measured the thermal time response of the liquid 3He inside the MCT in the temperature range T 2 - 150 mK. We find a thermal relaxation time of ∼490 s at T 1 mK. We have used scanning electron microscopy (SEM) to characterize the heat exchanger and BET absorption for determination of the specific surface area.

Original languageEnglish (US)
Article number012037
JournalJournal of Physics: Conference Series
StatePublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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