New approach to building magnets yields new world record

  No insulation? No problem! In fact, by challenging the conventions of magnet making, MagLab engineers created a first-of-its-kind magnet that has only just begun to make records. Using a new approach to magnet making, engineers at the National MagLab have broken a world record for a high-temperature superconducting (HTS) coil operating inside a high-field resistive magnet. In the process, they have thrown wide open a new door to exciting advances in magnet making and magnet-related research.
  On April 7, a team led by MagLab engineer Seungyong Hahn tested a small but potent magnet made of rare earth barium copper oxide, or REBCO, which efficiently conducts electricity without any resistance at relatively high temperatures and magnetic fields. Putting the magnet coil inside one of the MagLab's strongest magnets, the team achieved a magnetic field of 40.2 teslas. (Tesla is a measure of magnetic field strength; a typical refrigerator magnet has a field of .01 teslas). The smaller coil's 9.2 tesla field combined with the larger magnet's 31 tesla field to generate the new record.

In addition to eclipsing the previous record of 35.4 tesla, the test demonstrated the impressive potential of a new way of making high-field magnets, and the ability of the magnet material to continue to superconduct even in a very high magnetic field. 

  Scientists use magnets to study materials, chemical compounds and biological processes, all of which reveal secrets when exposed to high magnetic fields. The high fields are created by running very large amounts of electrical current through conductors. Resistive magnets use copper and silver as conductors, while superconducting magnets use special materials that carry current with perfect efficiency, but usually only at very low temperatures. Either way, the more electricity used, the higher the field of the magnet.

  Using an inventive approach that challenged the conventions of magnet making, Hahn and his team were able to jettison extra materials that contributed nothing to the magnet’s field.

Entire Article: https://nationalmaglab.org/news-events/news/new-approach-to-building-magnets-yields-new-world-record