Specifications for the CAD design of the MITICA grids

In the framework of the activities aimed at developing and optimizing the Heating and Current Drive Neutral Beam Injectors (H&CD NBIs) for ITER [1][2], the SPIDER and MITICA experiments are planned to be built at Consorzio RFX in the PRIMA facility. The purpose of MITICA is to demonstrate that all the operational parameters of the ITER HNB accelerator can be experimentally achieved with reasonable margin, thus establishing a large step forward in the performances of neutral beam injectors in comparison with the present experimental devices. The accelerator represent one of the most critical parts of the MITICA experiment, because it is requested to have an optimal performance in terms of optics while being subjected to high heat loads and high voltage conditions. Moreover, the efficiency of the whole injectors is largely influenced by the performance of the accelerator. This report gives the specifications and methods that have been followed during the design of the MITICA grids, in order to satisfy all the requirements and to have a simple and repeatable design process.