A strand-level finite-element model of Fermilab's Bi-2212 cos-theta insert shows a maximum Von Mises stress of 68 MPa in the superconductor at 10 kA, below the 120 MPa design limit.
Conductor Properties and Coil Technology for a Bi2212 Dipole Insert for 20 Tesla Hybrid Accelerator Magnets
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abstract
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.
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Magnetic and Mechanical Analysis of Bi-2212 Rutherford Cable in a Cos-Theta Sub-Scale Dipole Coil
A strand-level finite-element model of Fermilab's Bi-2212 cos-theta insert shows a maximum Von Mises stress of 68 MPa in the superconductor at 10 kA, below the 120 MPa design limit.