Extracted Strand Magnetizations of an HQ Type $\hbox {Nb}_{3}\hbox {Sn}$ Rutherford Cable and Estimation of Transport Corrections at Operating and Injection Fields

One of the goals of the Large Hadron Collider Accelerator Research Program (LARP) is to demonstrate the feasibility of Nb₃Sn technology for a proposed luminosity upgrade based on large aperture high gradient quadrupole (HQ) magnets. For such magnets, field quality at the bore is a critical requirement for which reason the parasitic magnetization of the windings must be reduced to manageable limits. In other words, it is necessary to minimize 1) the static intrastrand persistent-current magnetization of the cable and 2) the cable´s coupling magnetization caused by coupling currents passing through interstrand contact resistance during field ramping. This report focuses on persistent-current magnetization as measured by vibrating-sample magnetometry on pieces of strand removed from a section of heat treated HQ cable.