40 Tesla miniature magnets.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41811962.
- Also identified by DOI 10.1126/sciadv.adz5826 and PMC identifier 12978251.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Ultrahigh magnetic fields enable substantial advancements across a wide range of scientific disciplines. Traditionally, steady fields above 40 tesla have been achievable only with large resistive magnets that consume megawatts of power. Here, we demonstrate peak fields of 38 and 42 tesla using two compact all-HTS magnets, composed of two and four pancake coils, respectively. These magnets achieve current densities of up to 2257 amps per square millimeter and feature an exceptionally small bore diameter of 3.1 millimeters. Furthermore, the magnet coils are small enough to fit in the palm of a hand and consume less than 1 watt of power. Such compact magnets are realized through specialized winding methods that enable seamless winding over the small diameter while preserving the current-carrying capacity of the HTS tape. Nuclear magnetic resonance (NMR) experiments were performed inside the 3-millimeter magnet bore to provide calibration points for Hall sensors. These results show the potential of compact all-HTS magnets to enable widely accessible high-field NMR and other applications.