35.4 T

1. 35.4 T Field Generated Using a Layer Wound Superconducting Coil Made of REBCO Coated ConductorGregory S. Boebinger, Florida State University, DMR 0654118Applied Superconductivity Center/Magnet Science and Technology • A new world-record magnetic field of 35.4 T inside a superconducting coil has been reached using a single piece of ~100 m of high temperature superconducting REBa2Cu3O7-x (REBCO) coated tape wound in layers and nested in a 31 T background magnet. • Currently low temperature super-conductors Nb-Ti and Nb3Sn have been used for most superconducting high field magnets, whose maximum field is limited to ~24 T by their relatively low upper critical fields. • REBCO has an upper critical field that exceeds far beyond 100 T at 4 K, 3-4 times higher than that of best of the conventional superconductors, Nb3Sn. • REBCO coated conductor will substantially transform the technology of high field magnets. They could enable very high field NMR at fields well above 30 T and MRI systems at 3-6 T operating in cryogen-free systems, accelerators, and devices used in solid state physics and other applications in which high magnet fields are needed. 35.4 T (top) Plot of the quench currents vs. magnetic field for two bath temperatures: 4.2 K and 1.8 K. The dashed line is the load line of the insert. Helium gas trapping close to the terminal of the coil caused some heating and reduced quench currents in the field region above 20 T. (left) Image of a coil of the same type as the one tested. The record coil was 64.5 mm long, with an inner diameter of 14.3 mm, and an outer diameter of 38 mm. 38 mm

2. 35.4 T Field Generated Using a Layer Wound Superconducting Coil Made of REBCO Coated ConductorGregory S. Boebinger, Florida State University, DMR 0654118Applied Superconductivity Center/Magnet Science and Technology • Superconducting magnet systems based on high temperature superconducting materials can offer highest field strengths at a fraction of the operating costs of resistive magnets. • There is a strong interest in the NMR and high energy physics communities in high field superconducting magnet systems with there are collaborations and partnerships. • A pancake-wound, all-superconducting 32 T user research magnet is currently under construction at the NHMFL. This magnet is aimed to be in service in 2013. • Based on the success of this insert a larger insert is planned to operate in the NbTi/Nb3Sn NHMFL 20 T magnet forming an all superconducting 25 T user type system. • The R&D activities on high temperature superconducting magnets encourage active participation of graduate students and post docs as part of their curricular activities. • It is likely that this insert user magnet system will also see use by scientists from underrepresented groups with whom NHMFL staff are fostering relationships through the Open Door Diversity Lab. Highest fields generated by superconducting R&D magnets magnets during the last 10 years. Recent improvements in conductor technology has caused a peak in the performance of HTS magnets. The two conductors featured here, REBCO and round wire Bi-2212 are not be understood as mere competitors in field of HTS magnets but rather as complements with each being more suitable for certain applications than the other.