The U.S. Magnet Development Program (US-MDP) explores high-field accelerator magnets that require operating conditions beyond the limits of Nb$_3$Sn technology. The ongoing R&D process for High-Temperature Superconductor (HTS) characteristics enhancement suggests using Bi$_2$Sr$_2$CaCu$_2$O$_{8-x}$ (Bi-2212) as a superconductor element. Coils made of Bi-2212 Rutherford cable maintain high...
Bi-2212 round wire is the only viable HTS superconductor to produce high-field magnets. It can be fabricated in a variety of multifilamentary architectures, and it can be fabricated into Rutherford and six-on-one cables. Rutherford cabling degrades JE of the round Bi-2212 wire, and the isostatic overpressure heat treatment (OPHT) used for Bi-2212 distorts the shape of the wires. Single...
In the last years, the search for high critical-temperature superconductors has focused on metal and molecular hydrides, which may exhibit superconductivity at room temperature under very high pressures [1]. Actually, such behavior has been suggested by N. W. Ashcroft in 1968, since hydrogen-based materials possess elevated vibrational frequencies, as a consequence of the low atomic mass of...
