Magnetization loss for stacks of ReBCO tapes

Abstract

The AC loss measurements of the HTS cable prototype in the EDIPO test facility motivated detailed investigations of the loss contributions from the tape, strand and cable stages of the HTS fusion conductor design proposed at Swiss Plasma Center (SPC). As an initial step of the task, magnetization tests of soldered stacks of HTS tapes were carried out at 5 K and 77 K temperatures and magnetic fields up to 12 T using the vibrating sample magnetometer (VSM) technique. The influence on the magnetization loss of the number of tapes, width of the tape, field's orientation and tape's manufacturer is studied experimentally performing both the major and minor magnetization loops with different ramp rates of the applied magnetic field. In order to validate the test results, a numerical model is developed and presented in this work. From the numerical model we also deduced an analytical approach for the magnetization loss in the stacks of tapes with arbitrary number of tapes in the critical state model. Comparison between the measured and estimated magnetization loss of the cable prototypes is reported as well.

Non-twisted stacks of coated conductors for magnets: Analysis of inductance and AC losses

“…The magnetization loop of a non-twisted stack (28 tapes, 3 mm wide) was measured at Frascati (see Fig. 9 in [43]): from the area of the magnetization loop (from -12 T to 12 T) the hysteretic loss can be estimated to be about 260 J/m, which is in agreement with Fig. 5.…”

Evaluation AC Losses in Large-Scale Conductors Consisting of Stacked REBCO Tapes

“…These conductors are exposed to a changing magnetic field with the tapes being electrically connected and twisted; thus, during the magnet excitation and discharging processes, intertape coupling losses are generated in these conductors in addition to hysteresis losses. Hysteresis losses in REBCO tapes have been investigated from both theoretical and experimental perspective and are considered to be relatively easy to be predicted [5][6][7][8]. However, checking whether the obtained results are in good agreement with the predicted ones is necessary even under conditions of coupling current flow in the conductors.…”

Distribution of Trapped Magnetic Flux in Superconducting Stacks Magnetised by Angled Field

“…Such current leads can carry very large currents and benefit from improved thermal stability. Complex patterns of angled fields are expected to be formed in twisted stacks considered for the application in fusion reactors [23,24].…”