  The ForwArd Search ExpeRiment (FASER) is an experiment searching for new
light and weakly-interacting particles at CERN's Large Hadron Collider. FASER
is composed of different sub-detectors, including silicon microstrip detectors,
scintillator counters and an electromagnetic calorimeter. In this paper, a new
preshower detector for the FASER experiment is presented. The new detector,
based on monolithic pixel ASICs, will provide excellent spatial and time
resolutions and a large charge dynamic range. First results from a prototype
chip produced by IHP in 130 nm SiGe BiCMOS technology are shown.
