  Developing HTS dipole inserts producing fields larger than 5 T within 15 T
Nb3Sn outserts is necessary to generate 20 T or higher fields for future high
energy colliders. Dipole inserts based on the cos-theta coil geometry with
various stress management concepts and Bi2212 superconducting strand and cable
are being developed at Fermilab both within and beyond the U.S.-MDP effort. The
ultimate goal is to develop coil technology and an approach to manage azimuthal
and radial strains of high temperature superconductor inserts when integrated
within Nb3Sn outserts as a hybrid magnet system. This white paper reviews
Bi2212 conductor properties and coil technologies, and proposes new ideas to
face the challenges that Bi2212 still presents as an accelerator magnet
conductor.

Accelerator Physics;High Energy Physics - Experiment