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Hi Romy,
Splendid work - much appreciated research this!

I know this is totally premature, but if you do find that you prefer the S2 as the flux is increased and hit a current limit for the coil, then you *might* get a flux benefit by using a lower carbon alloy than 12L14, for example, 1005. But the choice of alloy may not be the bottleneck.

Also admire your restraint in not immediately proclaiming this the best thing ever :-) If you're previous investigations into the S2 are anything to go by, it's going to take a while to get to the bottom of this one, especially as you can now play with the current...

[just edited - I didn't see your above post relating to temperature, believe it or not]
To increase the flux, may want to revisit the part magnet/part field coil idea. Trouble is, Nd doesn't like getting hot. Maybe ferrofluid could be used. Or build your own outer magnetic circuit as you are saying, retaining the S2 diaphragm, phase plug, pole pieces and throat.... OK, maybe Rich will have more useful suggestions....

Great stuff,
cv

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