Analysis of coupled electromagnetic-thermal effects in superconducting accelerator magnets

Abstract

The planned facility FAIR will include 5 magnet rings including two superconducting synchotrons. The SIS100 synchrotron is the core component of the facility and will be equipped with 2 Tesla dipole magnets pulsed with 4 Tesla/s. The cable of the magnet coils is made of a hollow NbTi composite cable of about 7 mm outer diameter, cooled with two-phase helium flow at 4.5 K. We calculate the heat load, the eddy and the hysteresis losses, investigate the impact of the ramping on the magnetic field, on the safety margin of the conductor and the required cooling for all different elements of the magnet including the coil, the yoke, the bus bars and the beam pipe. This analysis is based on properties measured at cryogenic temperatures and fine detailed FEM models.

Archives of Electrical Engineering

“…It is expected that the major internal source of heat in the accelerator will be AC losses in the superconducting magnets [5]. The losses in the superconducting magnets were calculated numerically [6] and measured experimentally [7]. In this work a numerical approach is employed to predict the heat generation in bus-bars of a by-pass line for SIS100.…”

Heat generation by eddy currents in a shell of superconducting bus-bars for SIS100 particle accelerator at FAIR

“…SIS100 magnets are going to operate under several regimes [8]. AC losses occurring in superconducting magnets were calculated analytically [9] and measured experimentally [10,11]. They were found to be major heat input for both SIS100 [12] and its planned extension, SIS300 [13].…”