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Mesure calorimétrique à 77 K des pertes en courant alternatif de rubans supraconducteurs à haute température critique, une nouvelle méthode de mesure.

Calorimetric ac-loss measurement of high Tc-tapes at 77 K, a new measuring technique.

Auteurs : SCHMIDT C.

Type d'article : Article

Résumé

A method is described for calorimetric ac-loss measurements of high Tc-tapes at 77 K. It is based on a technique approved at 4.2 K for conventional superconducting wires which allows a very easy and precise loss measurement in parallel or perpendicular external field orientation. The slight temperature increase of the sample in an ac-field, thermally insulated from the liquid nitrogen bath, is used as a measure of losses. The thermal insulation is provided by a material of low thermal conductivity, no vacuum vessel is used. Simultaneously the sample magnetization can be measured. All necessary sensors are incorporated in the sample holder allowing a rapid sample change. the combination of the calorimetric method at 77 K with the easier magnetization measurement allows a rapid sample change. The combination of the calorimetric method at 77 K with the easier magnetization measurement allows to determine the ac-losses in a wide frequency and amplitude range of the external ac-field. The main part of data is obtained by the magnetization measurement while the calorimetric measurement is used for calibration.

Détails

  • Titre original : Calorimetric ac-loss measurement of high Tc-tapes at 77 K, a new measuring technique.
  • Identifiant de la fiche : 2001-2629
  • Langues : Anglais
  • Source : Cryogenics - vol. 40 - n. 2
  • Date d'édition : 2000

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