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A test facility for the development of the Neutral Beam Injection system forITER is under construction at Consorzio RFX. It will host two experiments:SPIDER, a 100 keV H-/D- ion RF source, and MITICA, a prototype of the fullperformance ITER injector (1 MV, 17 MW beam). A set of diagnostics will monitorthe operation and allow to optimize the performance of the two prototypes. Inparticular, Beam Emission Spectroscopy will measure the uniformity and thedivergence of the fast particles beam exiting the ion source and travellingthrough the beam line components. This type of measurement is based on thecollection of the H{\alpha}/D{\alpha} emission resulting from the interactionof the energetic particles with the background gas. A numerical model has beendeveloped to simulate the spectrum of the collected emissions in order todesign this diagnostic and to study its performance. The paper describes themodel at the base of the simulations and presents the modeled $H_\alpha$spectra in the case of MITICA experiment.

Modeling and simulation of a beam emission spectroscopy diagnostic for the ITER prototype neutral beam injector