Feasibility study of parallel conduction cooling of NbTi magnet and sample probe in a cryogen-free magnet system

Isabel Catarino, V. Soni, S Kar, João Barreto, D. Martins

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The conduction cooling of both a 6 T superconducting magnet along with a sample probe in a parallel configuration is addressed in this work. A Gifford-McMahon (GM) cryocooler is directly cooling the NbTi magnet, which aims to be kept at 4 K, while a gas-gap heat switch (GGHS) manages the cooling power to be diverted to the sample probe, which may be swept from 4 K up to 300 K. A first prototype of a GGHS was customized and validated for this purpose. A sample probe assembly has been designed and assembled with the existing cryogen-free magnet system. The whole test setup and components are described and the preliminary experimental results on the integration are presented and discussed. The magnet was charged up to 3 T with a 4 K sample space and up to 1 T with a sweeping sample space temperature up to 300 K while acting on the GGHS. Despite some identified thermal insulation problems that occurred during this first test, the overall results demonstrated the feasibility of the cryogen-free parallel conduction cooling on study.
Original languageEnglish
Article number UNSP 012127
JournalIOP Conference Series: Materials Science and Engineering
Publication statusPublished - 2017
Event26th International Cryogenic Engineering Conference / International Cryogenic Materials Conference - New Delhi, India
Duration: 7 Mar 201611 Mar 2016



  • Thermodynamics
  • Materials Science

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