Quench Performance of a 4-m Long ${\rm Nb}_{3}{\rm Sn}$ Shell-Type Dipole Coil

Fermilab has finished the first phase of Nb
₃
Sn technology scale up by testing 2-m and 4-m long shell-type dipole coils in a dasiamagnetic mirrorpsila configuration. The 2-m long coil, made of Powder-in-Tube (PIT) Nb
₃
Sn strand, reached its short sample limit at a field level of 10 T. The 4-m long coil, made of advanced Nb
₃
Sn strand based on the Restack Rod Process (RRP) of 108/127 design, has been recently fabricated and tested. Coil test results at 4.5 K and 2.2 K are reported and discussed.