Speaker
Description
Recent years have seen significant development of high-temperature superconducting Bi-2212 wires and magnets in the US with record critical current density, record wire lengths and record performance model magnets. A dozen racetrack coils have been produced within the LBNL subscale accelerator magnet program using Bi-2212 Rutherford cables, including the record performance of RC6, which carried 8.6 kA and operated safely at a wire engineering current density of 1000 A/mm2. In addition, a 4.7 T common coil dipole magnet RC7n8 was made from twisted industrial wires. In this talk, we will examine coil fabrication technology based on a canted-cosine-theta magnet technology with stress management capability for achieving dipole fields greater than 15 T, and present results of prototype dipole magnets including quench characteristics and field quality. Performance will be examined in the larger context of applicability of Bi-2212 for the next generation high energy physics colliders and other applications. We will also discuss the efforts to increase the Bi-2212 coil length to ~1 m long using the overpressure processing heat treatment for the first time.
