A Field Quality Modeling in Canted Cosine Theta Dipole Magnets Wound Using REBCO Cables

Journal Article · 12 February 2024 · IEEE Transactions on Applied Superconductivity

DOI: https://doi.org/10.1109/tasc.2024.3365092 · OSTI ID:2349247

Majoros, Milan  ^[1]; Sumption, M. D.  ^[1]; Xue, S. ^[1]; Myers, C. S.  ^[2]; Collings, E. W. ^[1]

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1. The Ohio State Univ., Columbus, OH (United States)
2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

In accelerator magnets the magnetic field quality is an important parameter. Using REBCO tapes or cables in magnet windings affects the magnetic field quality because of a quite high magnetization generated by these conductors. In this paper we analyzed numerically (using FEM) an effect of various REBCO cables’ magnetization on the field quality of canted cosine theta (CCT) dipole magnets. The magnetic properties of the cables were taken from our measurements of their M (H) curves at 4.2 K and magnetic fields up to 12 T. Also, flux creep effects were measured and their effects on field quality analyzed. Here we present a modeling of a CCT magnet containing 1 dipole double layer wound using a CORC and STAR cable. To make the FEM modeling less computationally “expensive”, we modelled only a section of 10 turns of the magnet's central part and calculated b3 fields on a circle of 2/3 of the innermost layer center line. Special M (H) curves measured during various field cycles (the so called “pre-injection cycles”) are effective in decreasing b₃ fields of the magnets. Flux creep effects suppress the b₃ fields further. In conclusion, using these techniques b₃ fields less than 10 units can be achieved.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); The Ohio State Univ., Columbus, OH (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-05CH11231; SC0011721
• OSTI ID: 2349247
• Journal Information: IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 5 Vol. 34; ISSN 1051-8223
• Publisher: IEEECopyright Statement
• Country of Publication: United States
• Language: English