18.9} Magnetic fields

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 Transport in magnetic fields was extended to electrons and positrons
 in 1990 by Ferrari. In 1992 and again in 1994, the magnetic field
 tracking algorithm was completely reworked by Ferrari and Sala in
 order to overcome the many limitations of the previous one. The new
 algorithm was much more precise and fast, it supported complex
 particle/boundary interactions typical of multiple scattering, allowed
 for charged particle polarisation and did no longer miss by construction
 any geometrical feature, even if small, met along the curved path.

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