Measurements of Dynamic Effects in FNAL 11-T Nb3Sn Dipole Models

Fermilab, in collaboration with CERN, has developed a double-aperture 11-T Nb
₃
Sn dipole suitable for the high-luminosity LHC upgrade. During 2012-2014, a 2-m-long single-aperture dipole demonstrator and three 1-m-long single-aperture dipole models were fabricated by FNAL and tested at its Vertical Magnet Test Facility. Collared coils from two of the 1-m-long models were then used to assemble the first double-aperture dipole demonstrator. This magnet had extensive testing in 2015-2016, including quench performance, quench protection, and field quality studies. This paper reports the results of measurements of dynamic effects in the single-aperture and double-aperture 11-T Nb
₃
Sn dipoles and compares them with similar measurements in previous NbTi magnets.