16 T Hybrid Dipole for an LHC Energy Doubler

• Published in: IEEE transactions on applied superconductivity Vol. 30; no. 4; pp. 1 - 6
• Main Authors: McIntyre, Peter M., Breitschopf, Jeff, Chavez, Daniel, Kellams, Joshua N., Sattarov, Akhdiyor
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-06-2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bismuth strontium calcium copper oxide; cable-in-conduit; Coils (windings); Configuration management; Critical current (superconductivity); Dipoles; Electron tubes; Geometry; Heat treatment; Niobium-tin; Stress; Superconducting cables; Superconducting magnets; Windings; Wires
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2020.2981301

We report the design for a hybrid block-coil dual dipole using advanced cable-in-conduit windings. The dipole is designed for use in the arcs of an energy-doubling lattice in the LHC tunnel. The block-coil design facilitates configuration of hybrid sub-windings of Bi-2212 and Nb 3 Sn, each operating to the same fraction of critical current. The cryogenics utilizes supercritical helium, operating in the window 4.3-5.5 K. A novel support structure provides robust support and stress management. The three sub-windings can be separately wound and heat-treated, then assembled and preloaded to complete the dipole. The short-sample field using commercially available Nb3Sn and Bi-2212 is 16.8 T. With a recently reported APC Nb3Sn, the short-sample field is 18.5 T.