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magnetic concentrator

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Hello,

I work on a cold crucible for the fusion of silicon with a coil around (around 10 kHz). I have done a 3D model of the crucible to know the efficiency of the crucible (how power is transmetted to the charge).
i want to study now if a magnetic field concentrator can be a good improvment in our set up. But, when I add a concentrator with caracteristics of fluxtrol compagny (high resistivity and high permeability) and don't have the expected result, the efficiency decreases. On simple 2D (or 2D-axy) geometries it's the same, no improvment. On Fluxtrol website 2D simulations are shown with high improvment of efficiency of coils.
Maybe I don't simulate correctly magnetism.
I use mf physic in Frequency domain with a single turn coil domain excited with voltage. Maybe I have to modify complex permeability ?

Any help will be very appreciated

Thank you

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