Shimming of magnets

The addition of small pieces of magnetizeable iron (a shim is a piece of corrective material) in order to achieve desirable properties of a magnetic field,

e.g. to approximate better

* \- constant deflection power  (  Errors in Track Reconstruction),
* \- field smoothness on the edges of pole faces,
* \- small field gradients in the neighbourhood of a symmetry plane,
* \- cylindrical symmetry for cylindrical pole faces in a C-shaped yoke,
* \- correction of imprecisions of coil mounting.

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