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

Conceptual Design of an HTS Dipole Insert Based on Bi2212 Rutherford Cable