TERMIUM Plus®

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HELIUM LIQUIDE SUPERFLUIDE [1 record]

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Record 1 2003-02-07

English

Subject field(s)
  • Chemistry
  • Cryogenics
CONT

While the microscope is capable of operation at temperatures varying from 1.5 to 300 K, all of the results of this article are obtained with the microscope immersed in 1.5 K superfluid liquid helium.

OBS

A remarkable transition occurs in the properties of liquid helium at the temperature 2.17 K, called the "lambda point" for helium. Part of the liquid becomes a "superfluid", a zero viscosity fluid which will move rapidly through any pore in the apparatus.

Key term(s)
  • super-fluid liquid helium
  • super fluid liquid helium

French

Domaine(s)
  • Chimie
  • Cryogénie
CONT

L'objectif principal est de reproduire de façon la plus fidèle possible les conditions réelles d'utilisation des capteurs dans le LHC [Large Hadron Collider] : les thermomètres sont irradiés à basse température (immergés dans l'hélium liquide superfluide à 1,8 K), avec des doses totales (1015 n.cm-2) et des spectres en énergie (1 à 10 MeV) de neutrons proches de ceux attendus dans le collisionneur.

Spanish

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