Design of the 1-Mw, 200-Ghz, Fom Fusion Fem

The FOM Institute for Plasma Physics has obtained funding for the development of a 1 MW, long pulse, 140-250 GHz free-electron maser. The engineering design is presently being performed in an international collaboration. In this paper the main components of the free-electron maser, the electron beam line, the undulator and the millimetre-wave system, are described. The basic design parameters of these components, which are optimized with the help of a fully 3-D, particle-pusher, FEM simulation code, are reported.