Abstract
Screening currents are field-induced dynamic phenomena which occur in superconducting materials, leading to persistent magnetization. Such currents are of importance in ReBCO tapes, where the large size of the superconducting filaments gives rise to strong magnetization phenomena. In consequence, superconducting accelerator magnets based on ReBCO tapes might experience a relevant degradation of the magnetic field quality in the magnet aperture, eventually leading to particle beam instabilities. Thus, persistent magnetization phenomena need to be accurately evaluated. In this paper, the 2D finite element model of the Feather-M2.1-2 magnet is presented. The model is used to analyze the influence of the screening current-induced magnetic field on the field quality in the magnet aperture. The model relies on a coupled field formulation for eddy current problems in time-domain. The formulation is introduced and verified against theoretical references. Then, the numerical model of the Feather-M2.1-2 magnet is detailed, highlighting the key assumptions and simplifications. The numerical results are discussed and validated with available magnetic measurements. A satisfactory agreement is found, showing the capability of the numerical tool in providing accurate analysis of the dynamic behavior of the Feather-M2.1-2 magnet.
Highlights
High Temperature Superconducting (HTS) materials are a promising technology for high-field magnets in particle accelerators
This paper presents the time-domain analysis of the demonstrator magnet Feather-M2.1-2, an HTS insert dipole designed to provide an additional 5 T in the Nb3Sn FRESCA2 background magnet, up to peak fields of 18 T in the magnet aperture
The analysis quantifies the influence of the screening currentinduced magnetic field on the magnetic field quality in the magnet aperture
Summary
High Temperature Superconducting (HTS) materials are a promising technology for high-field magnets in particle accelerators. A significant milestone in this direction was recently achieved by the EuCARD2 [5] and ARIES [6] projects, which led to the construction of the HTS accelerator dipole insert-magnet Feather-M2.1-2 [7, 8]. This demonstrator magnet is designed to operate inside the aperture of the Nb3Sn FRESCA2 dipole magnet [9, 10, 11, 12, 13], producing a peak field of 5 T at a nominal current of 10 kA, in a background field of 13 T. The magneto-thermal behavior of the Feather-M2.1-2 magnet was recently tested in a stand-alone configuration [14], and the influence of the superconducting coil dynamics on the magnetic transfer function was measured [15]
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