First Evaluation of Dynamic Aperture at Injection for FCC-hh
  In the Hadron machine option, proposed in the context of the Future Circular Colliders (FCC) study, the dipole field quality is expected to play an important role, as in the LHC. A preliminary evaluation of the field quality of dipoles, based on the Nb$_{3}$Sn technology, has been provided by the magnet group. The effect of these field imperfections on the dynamic aperture, using the present lattice design, is presented and first tolerances on the b$_3$ and b$_5$ multipole components are evaluated. 
B. Dalena, D. Boutin, A. Chanc\'e, B. Holzer, D. Schulte
physics.acc-ph