The no-insulation (NI) winding technique greatly enhances the thermal stability of REBCO (REBa2Cu3O x , RE = Rare Earth) pancake coils by avoiding burn-out and thermal runaway. The complicated electrical behaviors in NI REBCO pancake coils produce convoluted mechanical behaviors, so that some journal papers reported that high-field NI REBCO pancake coils were mechanically damaged during quench. To apply NI REBCO magnets for practical commercial use, it is important to understand the electromagnetic and mechanical behaviors of NI REBCO pancake coils in detail with both experiments and simulations. To clarify the electrical behaviors, a few simulation methods for NI REBCO pancake coils have been proposed; such as a simple RL parallel equivalent circuit. In these previous models, the radial current paths along the top and bottom of the pancake coils are represented as one current circuit path. However, since the radial current path of the bottom of one pancake coil is actually very close to that of the top of the next lowest coil, inductive behavior between these two paths appears. The simulation results show a probability that different amounts of radial current on the top and bottom of one pancake coil are carried during quench.
In recent years, strong magnetic field rare-earth barium copper oxide (REBCO) magnets are desired for various applications. For such magnets, since heat penetrating from current leads is undesirable, a flux pump is an attractive method to energize. However, it is difficult to apply a flux pump to a REBCO coil using no-insulation (NI) winding technique. Because, a large current flows into the radial direction due to a low contact resistance. Recently, a filter inductor installed into a rectifier transformer type flux pump (RTTFP) was proposed to effectively charge an NI REBCO single pancake coil. However, it is not sure whether it also works for multi-stacked NI REBCO pancake coils. Hence, we investigate the role of a filter inductor by a numerical simulation, and then we clarify the validity of filter inductor. As the result, the filter inductor accelerates the charging of multi-stacked NI REBCO pancake coils with low contact resistance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.