In JET, during some vertical displacement events (VDEs), the plasma
current and position are toroidally asymmetric. These events are referred to
as asymmetric VDEs (AVDEs). Analysis of the interactions among the
current carrying systems reveals that the repelling force between the plasma
and the vessel is of little significance in asymmetric events, even if it
is the main symmetric repelling force. The sideways force acting on the
vessel is shown to be due mainly to the interaction with the toroidal field
of the asymmetric circulation of currents in the wall. The asymmetric current
path in the vessel is then calculated analytically for a simplified
geometry and used together with experimental data to estimate the sideways
force on the vessel.
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