First Evaluation of Dynamic Aperture at Injection for FCC-hh

TL;DR

This paper evaluates how dipole field imperfections in the FCC-hh impact the dynamic aperture at injection, providing initial tolerances for magnet field quality based on Nb3Sn technology.

Contribution

It offers the first assessment of dynamic aperture effects due to dipole field quality in the FCC-hh at injection, with preliminary tolerances for multipole components.

Findings

Field imperfections affect dynamic aperture at injection.

Initial tolerances for b3 and b5 multipoles are proposed.

Magnet technology impacts collider performance.

Abstract

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.