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Description
Electromagnets used in the beam lines at GSI Darmstadt have been wound using metallic Cu wires. As a result, ohmic losses signify a non-negligible contribution to the energy consumption during machine operation. We performed a theoretical study aimed at one-to-one replacement – keeping the same number of turns and waveform of electrical current – of the Cu winding in one of the bending magnets with a coil wound with a coated REBCO conductor.
In the first step, a simplified semi-analytical approach was utilized to identify the suitable range of operating temperatures and preliminary estimation of dissipation in AC regime. Then, for a limited set of designs, time-dependent electromagnetic finite-element computation modeling the magnetic flux penetration in superconducting material during the unipolar cycle was performed. We found that the simplified analytical approach provided correct guidance towards optimization of the coil winding arrangement.
