Beam extraction from PoP FFAG using massless septum

A massless septum magnet is not same as an ordinary septum. It is a magnetic field septum no existence of conductor in the acceleration plane. New beam extraction method from FFAG (Fixed Field Alternating Gradient) synchrotron accelerator using massless septum magnet was proposed and the affectivity was verified by simulation. In conclusion, beam can be extracted continuously by combination of the massless septum and electrostatic septum. The beam extraction method using the massless septum magnet, design of the magnet, simulation of beam extraction are stated. (S.Y.)