  We study a scalar dark matter (DM) model with two DM species coupled to the
Standard Model (SM) particles via a sub-GeV dark photon. In this model, we find
that DM conversion occurs through the dark photon and it plays a fundamental
role in setting the observed relic abundance. Furthermore, the two DM
candidates can be produced at fixed-target experiments a la Beam- Dump.
Detailed predictions for signal and backgrounds are obtained with the help of
MadDump and NuWro Montecarlo generators. We explore the potential reach on the
sensitivity of DUNE near detector and SHiP experiment, and we find that
portions of the parameter space will be within reach of the two experiments
