Highest Magnetic Field

  • Author: ChemistryViews.org
  • Published: 19 June 2019
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
  • Source / Publisher: Nature/Springer Nature Publishing AG
thumbnail image: Highest Magnetic Field

Strong magnetic fields are required in many fields. They are used, for example, in medicine for magnetic resonance imaging (MRI), in pharmacy for nuclear magnetic resonance (NMR), and for particle accelerators such as the Large Hadron Collider (LHC). For almost two decades, 45 T has been the highest achievable direct-current (d.c.) magnetic field. To generate such a field a 31-MW, 33.6-T resistive magnet inside 11.4-T low-temperature superconductor coils is required. Such high-power resistive magnets are available in only a few facilities worldwide. Superconducting magnets have lower power requirements and are widespread.


David C. Larbalestier, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA, and FAMU-FSU College of Engineering, Tallahassee, FL, USA, and colleagues have built an electromagnet that is stronger, smaller, and more versatile than ever before. The high-temperature superconductor coil generates a magnetic field of 14.4 T inside a 31.1-T resistive background magnet to obtain a d.c. magnetic field of 45.5 T—the highest field achieved so far.

The heart of the magnet is a 43 µm thin, multi-layer tape, the so-called REBCO tape. It consists of a carrier layer on which a layer of a cuprate is applied. The cuprate consists of yttrium, gadolinium, and barium (REBa2Cu3Ox, where RE = Y, Gd). REBCO can carry more than twice as much current as a same-sized section of a niobium-based superconductor. On top of the REBCO tape are a silver layer and a copper stabilizer. This tape is tightly wound around a copper core.

The coil is highly compact and capable of operating at very high winding current densities because the magnet is wound without insulation. This allows rapid and safe quenching from the superconducting to the normal state. The scientists placed this superconductor electromagnet in a helium-cooled tube. The tube was located inside a conventional electromagnet. The magnet is thus a hybrid in which the superconducting magnet is located inside the ohm magnet.

According to the researchers, this magnet shows a viable way to high-field copper oxide superconductor magnets.


 

Article Views: 778

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH