RARE-EARTH END MAGNETS OF A MINIATURE RACE-TRACK MICROTRON AND THEIR TUNING*

We report basic results on the tuning of permanent end magnets of a compact 12 MeV race-track microtron (RTM) which is under construction at the Technical University of Catalonia. They are magnetic systems composed of four dipoles with the rare-earth permanent magnet (REPM) material used as a source of the magnetic field. The steel poles of the magnets are equipped with tuning plungers which allow to adjust the magnetic field level. In the article we shortly describe the tuning procedure and different techniques that were used in order to fulfill strict requirements of the field characteristics of the end magnets. It is shown that the obtained magnetic systems provide correct beam trajectories in the 12 MeV RTM. More detailed information about tuning procedure and results of tuning will be published elsewhere.