Development of TQC01, a 90 mm$hboxNb_3hbox Sn$Model Quadrupole for LHC Upgrade Based on SS Collar

As a first step toward the development of a large-aperture Nb
₃
Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, two-layer technological quadrupole models (TQS01 at LBNL and TQC01 at Fermilab) are being constructed within the framework of the US LHC Accelerator Research Program (LARP). Both models use the same coil design, but have different coil support structures. This paper describes the TQC01 design, fabrication technology and summarizes its main parameters