re: cores, that is the frustrating part. I've a few emails out. looks like the core in that paper I linked in post #1415, was kool mu, aka, sendust, aka SMMS, aka Fe-Si-Al, which is distributed air gap (and like a 100 year old material).
re capacitor boosters/buckers, in ltspice I always seem to see very high peak currents vs inductor designs, which I guess makes sense.
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