Finite element calculations on detailed 3D models for the superferric main magnets of the FAIR SIS100 synchrotron

Thermodynamic Properties of Fast Ramped Superconducting Accelerator Magnets for the Fair Project

“…The AC losses of the magnet were measured and were found to be as predicted by FEM calculations [2,3] and by extrapolations from model magnet measurements [7]. The model magnets were built using anisotropic iron.…”

“…Thus the reduction of the cryogenic load of the SIS 100 system was a main goal of the R&D next to an improved field quality 989 [1]. Additional computational studies now allow calculating the magnetic field and AC losses matching the measurements [2,3,4]. In 2007 it was decided to build full size magnets with different coil winding technologies as well as iron yoke properties (see FIGURE 1), two straight dipoles, (Babcoeck Noell GmbH (BNG) / Würzburg: kapton insulated coil, isotropic iron yoke and JINR / Dubna: epoxy impregnated coil, anisotropic iron yoke) a curved dipole (Budker Institute for Nuclear Physics, Novosibirsk) and a quadrupole (JINR / Dubna).…”

Analysis of coupled electromagnetic-thermal effects in superconducting accelerator magnets

“…In preliminary methodical studies we had developed the approach for simplified models and verified them comparing our results to experimental data and to the results of other noncommercial codes. In a next step, the 3D short models for the dipole and the quadrupole had been thoroughly analyzed [3]. To construct an appropriate electromagnetic-thermal 3D model for the new SIS100 full size dipoles and for a correct FE analysis, the design details and material properties of the vacuum chamber are very important, as well as its connection to the coil and the yoke.…”

“…The Nuclotron ring of the JINR Dubna was the starting point for the magnet design. In the preliminary R&D stage, the main operation criteria (magnet ac loss, magnetic field quality and mechanical stability of the coil) had been physically analyzed and numerically tested [2], including finite element calculations [3]. A real accelerator magnet uses different materials for different parts.…”

“…These are defined by the heat load due to the eddy current and hysteresis losses, their impact on the magnetic field as well as on the safety margin of the superconductor. We have been using the finite element code ANSYS 3 to fully describe the 3D electromagnetic behavior of accelerator magnets, especially of the superferric type [4].…”