Physics:Shimming of magnets
From HandWiki
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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