Abstract
To enable the physics research that continues to deepen our understanding of the Universe, future circular colliders will require a critical and unique instrument—magnets that can generate a dipole field of 20 T and above. However, today’s maturing magnet technology for low-temperature superconductors (Nb-Ti and Nb3Sn) can lead to a maximum dipole field of around 16 T. High-temperature superconductors such as REBCO can, in principle, generate higher dipole fields but significant challenges exist for both conductor and magnet technology. To address these challenges, several critical research needs, including direct needs on instrumentation and measurements, are identified to push for the maximum dipole fields a REBCO accelerator magnet can generate. We discuss the research needs by reviewing the current results and outlining the perspectives for future technology development, followed by a brief update on the status of the technology development at Lawrence Berkeley National Laboratory. We present a roadmap for the next decade to develop 20 T-class REBCO accelerator magnets as an enabling instrument for future energy-frontier accelerator complex.
Highlights
Higher magnetic field strengths enable a higher beam energy and the potential for particle physics discovery
By developing and demonstrating the REBCO high-field magnet technology as an enabling instrument for high-energy physics and fusion applications, we hope to stimulate various applications and industrial competition to drive down the cost of REBCO conductors and magnets
As part of the U.S Magnet Development Program (USMDP), the effort at Lawrence Berkeley National Laboratory (LBNL) currently focuses on developing CCT dipole magnet technology using round REBCO conductors
Summary
Higher magnetic field strengths enable a higher beam energy and the potential for particle physics discovery. These technical superconducting materials are currently commercially available and relevant for high-field superconducting accelerator magnet applications. There is significant potential to enable this improvement as evidenced by the record current density recently demonstrated in short REBCO tape samples [71] The data for the REBCO tape developed by University of Houston are from [71] with the magnetic field perpendicular to the tape broad surface. We discuss the research needs to develop high-field dipole magnets as an enabling instrument for future energy-frontier accelerator complex.
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