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Copyright (c) 2022 Alex Barksdale, Erica Mason, Eli Mattingly, Monika Sliwiak, John Drago, Lawrence Wald
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We present the fabrication and characterization of a shift coil assembly designed for a rotating permanent magnet FFL human fMPI imager. The realized system consists of two sets of inner and outer coils (“racetracks”), each driven by an independent amplifier. Hollow conductors and a highly parallel water-cooling circuit provide heat removal during operation. The measured electrical characteristics of the coils (Rinner = 310 mOhms, Linner = 26 mH, Router = 399 mOhms, Louter =41 mH, M = 22.6 mH) match simulated values well, and field efficiency measurements demonstrate ability to shift a 1.03 T/m FFL over a 20 cm FOV within driving capabilities of the amplifier system (field efficiency = 0.215 mT/A).
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