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RE: Apogees and ethics - comments

I read somewhere that the torsioning is caused by air leakage at the sides of the diaphragm, I assume that creates eddy currents which lead to chaotic behavior. I know from the Apogee patent that they varied the pitch of the corrugations to maintain more stiffness. I'm wondering if there isn't a way to maintain laminar flow at high velocities, or, barring that, to better damp the oscillations electrically. Or what about using two 1" ribbons in a single magnet assembly, separated by a thin divider, rather than one 2" one? I gather narrower ribbons are less subject to torsioning. Each ribbon would be in a laterally asymmetric B field, but you can apparently get pretty good field uniformity with finite element analysis.

Or maybe Graz fixed the problem after all. :-)

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