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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of low temperature physics 121 (2000), S. 809-814 
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have designed and built a demagnetization stage to operate between 1.8K and 0.5K, a somewhat unusual temperature range for adiabatic demagnetization refrigeration. The lower bound in temperature is dictated by the thermal performance of our 3 He gas heat switch, the upper by NASA specifications. We intend this demagnetization stage to be the fast stage of a proposed two-stage continuously operating adiabatic demagnetization refrigerator (ADR) which will operate between 1.8K and 50 mK. Here we discuss thermal, mechanical, magnetic and chemical considerations which led to novel features in our salt pill design.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Journal of low temperature physics 121 (2000), S. 579-584 
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We describe experiments on 3 He- 4 He mixtures in 98% open aerogel grown by cold-deposition (T≤80mK) of 4 He followed by the deposition of 3 He or alternatively by cooling down a homogenous mixture. The two approaches led to different 4 He film morphologies. We will also describe the observation of migration of 4 He from or toward the cell below 100 mK. This migration can lead to the exclusion of 4 He (other than the localized surface layers) for 4 He concentrations between 4% and 11% in the cell.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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