A high temperature superconducting demonstrator coil for ARCOS: a novel toroidal magnetic spectrometer for an astroparticle physics experiment in space

A magnetic spectrometer determines the signed rigidity of charged particles by measuring their trajectories in the presence of a magnetic field. High Temperature Superconducting (HTS) magnets can operate in space without the use of a cryogenic liquid. While HTS magnets have many potential applications in space, including active magnetic radiation shielding, we present the design of an HTS magnetic spectrometer with a toroidal magnet providing a bending strength of 3 Tm. The toroidal magnet is about 2m in outer diameter, 2m in height, and requires about 60 km of 12mm wide ReBCO HTS tape. The magnet operates with an engineering current density of 855A/mm(2) at a temperature of 20K and a peak magnetic flux density of about 12 T. In the context of the HTS Demonstrator Magnet for Space (HDMS) project, we have designed and are building a small-scale coil pack of the toroidal magnet. The demonstrator magnet consists of two racetrack-like coils enclosed with copper bands that function as current leads and layer jumps. The no-insulation winding method facilitates self-protection against quenches. A lightweight mechanical structure made from aluminum alloy supports the coils.