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Aux limites de la réfrigération : comment obtenir et maintenir de très basses températures au-delà de l'ambiance de la nature ?

Frontiers in refrigeration and cooling: how to obtain and sustain ultra low temperatures beyond nature's ambience.

Auteurs : KÖNIG R.

Résumé

The investigation of matter at very low temperatures close to absolute zero is a powerful and important subject as it provides the unique possibility for studying physical properties, e.g. phase transitions, in an environment where most of the unavoidable disturbances present at higher temperatures are almost completely frozen out. In particular, the improvement of the standard cooling techniques for mK-and microK-temperatures, i.e. helium 3-helium 4 dilution refrigeration and nuclear adiabatic refrigeration, respectively, opens up a temperature range for the study of liquid and solid matter several orders of magnitude below the minimum temperature existing in nature (background temperature of the universe, about 2.7 K). In this paper, some important contributions obtained at the ultra low temperature facility at the University of Bayreuth is discussed: 1) the achievement of a minimum electronic temperature of T(el)=1.5 microK by nuclear adiabatic refrigeration of platinum, 2) the progress in improving the thermal coupling between different materials at low temperatures, and 3) recent developments in low temperature thermometry.

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Détails

  • Titre original : Frontiers in refrigeration and cooling: how to obtain and sustain ultra low temperatures beyond nature's ambience.
  • Identifiant de la fiche : 2000-1162
  • Langues : Anglais
  • Source : 20th International Congress of Refrigeration: Refrigeration into the Third Millennium.
  • Date d'édition : 19/09/1999

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