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10 COPPI ET AL.Figure 5. Three-dimensional network used for structural analysis of a toroidal magneticelement.devices of this type are A = 2.5, B, 0 ^ 150 kG. This makes the field B„ atthe inside of the magnet, which is approximatelyB,, = B, 0 R/(R -a) = B l0 A/(A - 1),climb to 250 kG. Such a field is equivalent to an effective pressure ofabout 2500 atmospheres.We can thus understand how the design of an Ignitor-type devicemight present related problems in its analysis. Such problems areconfronted and resolved with finite element codes that have allowed thecalculation of the effective distribution of the mechanical and thermalpressures first and then the corresponding stresses and deformations.Figure 5 illustrates a three-dimensional network used for the numerical