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Zero Helium Boiloff MEG Technology

  • Petteri Laine
  • Jukka NenonenEmail author
  • Steve Chappell
  • Jukka Knuutila
Living reference work entry

Abstract

Whole-head MEG systems based on the low-Tc SQUID sensors utilize liquid helium to reach the temperature around 4 K. Until recent years, a typical MEG system needed a liquid helium refill once or twice per week. However, the increasing cost and the lack or limited availability of liquid helium for regular fillings have motivated commercial MEG manufacturers to develop zero-boiloff systems that maintain the low temperature without losing helium. In this section, we present the challenges, history, and state of the art of low helium consumption systems which employ a compact helium liquefier in open-loop, closed-loop, or integrated configurations. In addition we discuss possibilities for the future in liquid helium-free systems incorporating cryocoolers.

Keywords

Magnetoencephalography (MEG) Superconducting quantum interference device (SQUID) Gifford-McMahon cryocooler Joule-Thomson cryocooler Pulse tube cryocooler Cryogenic cooling Helium liquefier Zero-boiloff system 

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Petteri Laine
    • 1
  • Jukka Nenonen
    • 1
    Email author
  • Steve Chappell
    • 2
  • Jukka Knuutila
    • 1
  1. 1.MEGIN (Elekta Oy)HelsinkiFinland
  2. 2.York Instruments LtdYorkUK

Section editors and affiliations

  • Risto Ilmoniemi
    • 1
  1. 1.Department of Neuroscience and Biomedical Engineering010854-0654EspooFinland

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