Calculation of persistent currents in superconducting magnets

C. Völlinger; M. Aleksa; S. Russenschuck

doi:10.1103/PhysRevSTAB.3.122402

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Calculation of persistent currents in superconducting magnets

C. Völlinger, M. Aleksa, S. Russenschuck

DOI 10.1103/PhysRevSTAB.3.122402 · Physical Review Special Topics - Accelerators and Beams

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Abstract

This paper describes a semianalytical hysteresis model for hard superconductors. The model is based on the critical state model considering the dependency of the critical current density on the varying local field in the superconducting filaments. By combining this hysteresis model with numerical field computation methods, it is possible to calculate the persistent current multipole errors in the magnet taking local saturation effects in the magnetic iron parts into consideration. As an application of the method, the use of soft magnetic iron sheets (coil protection sheets mounted between the coils and the collars) for partial compensation of the multipole errors during the ramping of the magnets is investigated.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbTi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown