Martin (Michigan State University, East Lansing, USA) Berz & Kyoko (Michigan State University, East Lansing, USA) Makino 
An Introduction to Beam Physics [PDF ebook] 

The field of beam physics touches many areas of physics, engineering, and the sciences. In general terms, beams describe ensembles of particles with initial conditions similar enough to be treated together as a group so that the motion is a weakly nonlinear perturbation of a chosen reference particle. Particle beams are used in a variety of areas,