  The U.S. Magnet Development Program (US-MDP) is aimed at developing high
field accelerator magnets with magnetic fields beyond the limits of Nb$_3$Sn
technology. Recent progress with composite wires and Rutherford cables based on
the first generation high temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_8$
(Bi2212) allows considering them for this purpose. However, Bi2212 wires and
cables are sensitive to transverse stresses and strains, which are large in
high-field accelerator magnets. This requires magnet designs with stress
management concepts to manage azimuthal and radial strains in the coil windings
and prevent degradation of the current carrying capability of Bi2212 conductor
or even its permanent damage. This paper describes a novel stress management
approach, which was developed at Fermilab for high-field large-aperture
Nb$_3$Sn accelerator magnets, and is now being applied to high-field dipole
inserts based on Bi2212 Rutherford cable. The insert conceptual design and main
parameters, including the superconducting wire and cable, as well as the coil
stress management structure, key technological steps and approaches, test
configurations and their target parameters are presented and discussed.
