Hysteresis Loss of REBCO Conductor Up to 35 T

The hysteresis loss (Q_hyst) of a conductor is a very important parameter for magnet design. Due to the anisotropy of the REBCO conductor, its Q_hyst strongly depends on magnetic field orientation. During a field ramp of a REBCO magnet, at locations where radial field component is significant, Q_hyst may be large. This may significantly reduce the design temperature margin and increase the liquid helium consumption. Therefore, it is very important to measure the field and field angular dependence of Q_hyst of the REBCO conductor. In this paper, we measured Qhyst of a small REBCO sample by vibrating sample magnetometry. The measurements were performed in a resistive magnet at the NHMFL with magnetic fields up to 35 T. The magnetization of a 1×1 mm² sample was measured in different fields, field orientations, and temperatures. The implication of our experimental results on the REBCO magnet design is discussed.