Design of the MITICA neutral beam injector: from physics analysis to engineering design

For ITER heating and current drive, two neutral b eam injectors (NBIs) are planned, delivering a tota l of 33 MW in stationary conditions up to one hour; e ach injector will accelerate a 40 A D - current up to 1 MV. Such requirements have never been achieved simultan eously. Hence the PRIMA (Padova Research on ITER Megavolt Accelerator) facility is under constructio n at Consorzio RFX in Padua, Italy. PRIMA will incl ude a test bed named MITICA, with the aim of reliably meeting the ITER heating beam requirements. This contributi on describes the current status of analysis, devoted t o the optimization of MITICA, providing the inputs for the design of accelerator, beam line components, diagno stics, power supplies, control-data acquisition and interlock systems