Speaker
Description
The National High Magnetic Field Laboratory (NHMFL) has launched an innovative project to develop a 40 T all-superconducting user magnet. The first year of funding was awarded by the National Science Foundation and the project started in September 2018. Consideration of a 40 T superconducting user magnet set target specifications of a cold bore of 34 mm with a homogeneity of 500 ppm over a 1 cm diameter of spherical volume, a better than 0.01 T set-ability and stability, and with an ability to ramp up to full field 50,000 times over its 20 years design lifetime. It will be a fully superconducting magnet operated in a 4.2 K liquid helium bath, can withstand quenches at its full 40T field and provide a very low noise environment for experimentalists. These capabilities will enable the 40T SC magnet to support higher-sensitivity measurements than possible in present-day resistive and hybrid magnets, high-magnetic-field measurements that will be uniquely capable of addressing physics questions from previously inaccessible perspectives on a number of expanding frontiers in condensed matter physics. A 40 T superconducting magnet would enable more users to run long experiments at peak field with much less power consumption compared with resistive and hybrid magnets. Realization of a 40T SC magnet requires magnet technology that is beyond the present state-of-the-art. Initial analysis of different HTS magnet designs, each based upon one of the three presently viable HTS conductors: REBCO (Rare Earth Ba2Cu3Ox), Bi-2212, Bi-2223, has determined that each design faces significant technical challenges. Hence, four HTS magnet technologies consisting Insulated REBCO magnet technology (I-REBCO), No-Insulation REBCO magnet technology (NI-REBCO), Bi-2212 magnet technology, and Bi-2223 magnet technology will be developed in parallel initially. Technology gaps based on risk analysis at each stage will be closed to advance key technology components. The process repeats until the final design has emerged. The objective of the 40 T all superconducting user magnet and the current status of the project will be presented.
