Abstract
The U.S. Magnet Development Program (US-MDP) is aimed at developing high-field accelerator magnets with magnetic fields beyond the limits of Nb3Sn technology. Recent progress with composite wires and Rutherford cables based on the first generation high-temperature superconductor Bi2Sr2CaCu2O8−x (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 control azimuthal and radial strains in the coil windings and prevent the 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 Nb3Sn accelerator magnets, and is now being applied to high-field dipole inserts based on Bi2212 Rutherford cables. 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.
Highlights
Progress with round Bi2 Sr2 CaCu2 O8−x (Bi2212) composite wires, which can be used to produceRutherford cables, makes them suited for use in high-field accelerator magnets [1,2].This work started in the U.S several years ago within the U.S Very High Field SuperconductingMagnet Collaboration (VHFSMC) [3] and is being performed in the framework of the U.S MagnetDevelopment Program (US-MDP) [4]
This paper describes the insert conceptual design and main parameters, including properties of the superconducting wire and cable, as well as the coil stress management structure, key technological steps and approaches, test configurations and their target parameters
The design concept of the Bi2212 insert is based on a two-layer cos-theta coil with a stress management concept which was developed at Fermilab for high-field large-aperture Nb3 Sn accelerator magnets [6]
Summary
Progress with round Bi2 Sr2 CaCu2 O8−x (Bi2212) composite wires, which can be used to produce. Instruments 2020, 4, 29 found in the literature, more data on Bi2212 performance sensitivity to cable loading are needed It is already certain, that stress management concepts will need to be applied to insert coils’. This paper describes the insert conceptual design and main parameters, including properties of the superconducting wire and cable, as well as the coil stress management structure, key technological steps and approaches, test configurations and their target parameters. In preparation for this and future inserts, cable development and characterization, including the transport properties of the extracted strands, cable at field, and cable under pressure, will be performed.
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