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Fermilab is involved in superconducting accelerator magnet R&D under the framework of the U.S. Magnet Development Program (USMDP). An integral part of that program is High Temperature Superconducting (HTS) accelerator magnet development to demonstrate self-fields of 5 T or greater compatible with operation in hybrid LTS/HTS configuration to generate fields beyond 16 T for future High Energy Physics (HEP) applications.
To address the ever-increasing requirements on the magnetic field strength from the physics community, which lead to exorbitant levels of mechanical stresses in the coils and degradation of conductor properties, Fermilab is developing the Conductor on Molded Barrel (COMB) magnet technology. It offers an elegant solution for fabrication of dipole, quadrupole and higher-pole coils with round conductors, offering stress management and precise turn positioning to enhance the magnetic field quality.
The COMB magnet technology couples well with Symmetric Tape Round (STAR®) wires produced by AMPeers LLC, which are amongst the most promising REBCO conductors for future HEP applications. Due to the proprietary architecture placing the superconducting layer near the neutral plane of the tape, they offer unrivaled bending performance suitable for magnets with the bore size in 50-60 mm range, which will be needed for future HEP experiments.
This paper reports progress in the development of COMB magnet technology with STAR® wires. A two-layer dipole magnet with 60 mm clear bore has been recently fabricated and tested in liquid nitrogen. The purpose of the test was to determine what kind of critical current degradation occurs in the process of winding the STAR® wire into the COMB structure.
The reported magnet development efforts include design of the coil and the support structure with the magnetic and structural analyses, short sample studies to assess the critical current degradation due to conductor bending in the coil end regions, as well as the magnet fabrication and testing.
*This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics, through the US Magnet Development Program. This work was supported by U.S. Department of Energy Office of Science, Office of High Energy Physics SBIR award DE-SC0022900.
