In addition to POHEA, ...

The links below will guide you toward other educational materials that we have developed and used over the years...

Example (QT movie; see file below):  Mathcad was used to make this animation of a distribution of particles in phase space under the influence of a thin sextupole magnet in an otherwise linear system.  As the tune approaches the 1/3 integer,  the stable phase space region shrinks and particles are "extracted."

Mike Syphers,
Dec 15, 2015, 5:58 PM