Microtron

This chapter introduces the microtron, and to the theoretical material needed for the simulation exercises. It begins with a brief reminder of the historical context, and continues with the beam optics and acceleration techniques that the microtron method leans on, relying in that on basic charged particle optics and acceleration concepts introduced in the previous chapters. It further addresses the following aspects: The simulation of a classical microtron only requires one optical element: DIPOLE, and CAVITE for acceleration. Simulation of a racetrack microtron adds DRIFT to simulate drift sections, possibly BEND for small steering dipoles along the recirculation paths, and a series of CAVITE to simulate a linac section. Particle monitoring requires keywords introduced in the previous chapters, such as FAISCEAU, FAISTORE, PICKUPS, and some others. Beam path and optics optimization use FIT[2]. SYSTEM is used to, mostly, resort to gnuplot so as to end simulations with some nice graphs (orbits, fields, or else) obtained by reading data from output files such as zgoubi.fai (resulting from the use of FAISTORE), zgoubi.plt (resulting from IL \(=\) 2), or other zgoubi.*.out files resulting from a PRINT command.