> Knowing more about what you are doing would make question answering
> easier. Application, circuit, frequency, power level, DC component,
> core material, amp turns, ... .
>

This application is charging a capacitor, and discharging it
(practically shorted) through an array of series/parallel SCRs. The
test is designed to stress the end spray connection of film
capacitors.

I need inductance to limit di/dt so I don't destroy the SCRs. My
operation frequency and power level will be different depending on the
test I'm conducting (.1uF to 220uF). The frequency is usually in the
100kHz range, but only lasts a few cycles as the shorted RLC circuit
dampens.

Peak currents can be as high as 2100A. I have modeled the circuit with
an Excel spreadsheet and now with Mathcad, but I'm missing a key
formula, and that's inductor saturation.

I can use air core inductors, since (depending on who you talk to) can
never saturate. The only problem is that if I need 2uH of inductance
to slow di/dt an air core inductor is much larger and can have enough
series resistance to limit my peak current. In short, unworkable.

I would like to use a ferrite core inductor to keep the wire length
down (and the series resistance down) but they saturate severely at
current levels of 100-200A. Since my target peak amperage and charge
voltage will be moving targets, I would like a way to model a
saturated inductor.

I've thought of using SPICE, but I'm not sure of its inductor
saturation modeling, and I'd like a way to calculate the exact
inductance I need rather than a trial and error model.
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