Mechanical measurements on the race-track prototype for the ATLAS B0 and barrel toroid magnet

The ATLAS Barrel Toroid (BT) consist of 8 superconducting coils 25 m long and 5 m large, In order to check the stability of the magnets and the technical solutions for the construction a scaled magnet, called B0, is under construction. A race-track coil 2.7 m long and 0.7 m large has been built, to verify the characteristic of the superconducting conductor. As a matter of fact this race-track magnet is the first multi-turn superconducting magnet, with indirect cooling, built with fully bonded aluminum coil. The mechanical deformations of the magnet during the energization and the induced quenches are monitored in 12 points. The overall transverse deformation of the magnet is measured by 6 strain gages placed on measuring clamps connecting the two arms of the magnets, 3 on the upper side, and 3 on the lower side of the magnet. The other sensors are placed on one arm, on the casing of the magnet: 5 on the external part and 1 in the inner part in order to see the bending of the arm. Removable reinforcing clamps are present between the arms. The mechanical measurements obtained with and without the reinforcing clamps are presented.