Recent advances in high-field magnets at TML

Abstract

The Tsukuba Magnet Laboratory (TML) of the National Research Institute for Metals has been producing epoch-making achievements in the history of high-field magnets. Its hybrid magnet is in operation, providing users with fields up to 30 T in a 52-mm∅ room-temperature bore. In September 1999, the hybrid magnet generated a field of 37.3 T in a 32-mm∅ room-temperature bore, which was the world record of the steady-state fields at that time. The superconducting magnet system operating at TML succeeded in generating 23.4 T using two Bi-2212 insert coils. As a milestone in the 1 GHz NMR magnet project carried at TML, a 900 MHz NMR magnet was successfully manufactured and operated in a persistent mode. A challenging program in which different types of superconducting magnets are developed to meet specific requirements is in operation. One example is a magnet designed to generate uniform magnetic force fields defined as B grad B in a sample space. TML is now a user facility open to domestic and international users. Efforts will be continued to improve its high-field facilities by developing magnet technology as well as materials for high-field magnets.