As part of the second phase of Advanced Virgo upgrade program, instrumented
baffles are being constructed to be installed around the end mirrors in the
main arms, in continuation of what has been implemented for the input mode
cleaner end mirror during phase I. These baffles will be equipped with
photosensors, allowing for real-time monitoring of the stray light around the
mirrors. In this paper, we present optical simulations of the light
distribution in the detector main cavities to assess the ability of the sensors
to effectively monitor misalignment and defects on the mirrors surface and to
play a role in the pre-alignment of the interferometer.
