  This note describes an extended exercise on the finite-element (FE)
simulation of an accelerator magnet. The students construct and simulate a
magnet model using the FEMM freeware. They get the opportunity to exercise on
the theory of FEs, including Maxwell equations, magnetoquasistatic formulation,
weighted residual approach, choice of appropriate FE shape functions and
algebraic system of equations, thereby guided by fill-in sheets. They are
invited to implement the most crucial parts of a simple FE solver. Finally, the
own software is used to simulate the magnet once more and to develop some
problem-dedicated post-processing routines. The exercise educates students in
accelerator physics and electrical engineering on the construction and
simulation of accurate and manageable FE models, the algorithms behind a
standard FE solver and some ideas to extend a FE solver for own purposes. All
necessary files to carry out the exercise are freely available.
