Abstract
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.
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