Clearences in a magnet

Hello,

I have a model for a dipole magnet, and of course I want to simulate its magnetic field. I have a single-turn coil in the iron yoke. It is a septum magnet for particle accelerators, so I am curious about the flux density inside the bending magnet and next to the blade, where the beam circulates.

I am new to COMSOL and I did not have the same problem with the previous program I used (Opera), because there the conductor was not meshed at all, however here there are thin insulations between the coil and the yoke, which I am simply unable to mesh, I tried basically everything, errors always., The best idea maybe was to define a block for the clearance, mesh the surface using mappings then sweep it along the very thin volume (error: Unsupported topology of linking face), nothing worked.

I used the inductor tutorial of the AC/DC module, as a starting point, but I am afraid I am doing something wrong. We cannot neglect the clearances, because we are curious about the strayed field next to them, and of course the coil cannot touch the yoke. Can you please advise anything?

Thanks in advance!
Zsolt