Since the external field cannot be defined explicitly in FEMM, we have to model a coil to generate the magnetic field. Two different models have been tested. First, a coil of a single turn, whose dimensions are equivalent to the outer dimension of the field coil, which has been used in the experiments. Secondly, a detailed model of the coil with 4 layers of 24 windings each has been created.
inner diameter: 70 mm
outer diameter: 120 mm
height: 226 mm
cross section: 11300/2 = 5650 mm2
Figure 
: Single turn coil
4 layers of 24 turns each
cross section: 4(9 mm2
total cross section: 4(24(36 mm2 = 3456 mm2
Figure 
: Detailed coil model
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