Superconducting coils system

SC Coils Optimization

· The superconducting coil system minimizes the SC volume with a given stray field. The optimization was done by means of local (Sequential Quadratic Programming) and global (Evolution Strategy) optimization algorithms.

Coil positions and dimensions, and magnetic flux line distribution for the active shielding configuration.

The dotted lines show the traces of the main components of the cryogenic system.

· The main data of the superconducting coils system are:

Coil A

Coil B

Inner radius

Outer radius

Height

Number of turns

Maximum magnetic induction

0.147 m

0.198 m

0.247 m

8820

4.32 T

0.374 m

0.405 m

0.066 m

1512

2.10T

SC Coils Design

· Coil A is realized by means of 5 sub-coils separated by 4 layers of copper bars which let the heat produced by the ac losses mechanism to be removed by the boiling helium at the surface of the coil.

· Coil B is realized by means of 2 sub-coils separated by a layer of copper bars.

· The maximum temperature calculated in the heaviest case is of 5.18 K

MAGNETIC SYSTEM of the
200 KJ/75 kW m-SMES prototype
of the University of Bologna

Currently under construction at ANSALDO SUPERCONDUTTORI