FLUKA studies for a new sampling calorimeter in the forward ECAL of CMS

The DPS note presents first results for a possible sampling calorimeter in the forward ECAL for the upgraded CMS experiment at the HL-LHC using the Monte Carlo simulation program FLUKA. The implementation of the electromagnetic sampling calorimeter in FLUKA, using CeF3, LYSO or YSO as an active medium, is described and an extrapolation to the behaviour of such a calorimeter is performed. The induced ambient dose, the electromagnetic fluence and the neutron energy spectra are studied. Particular attention is given to the creation of isotopes in a LYSO/W sampling calorimeter that would contribute a constant prohibitive background to the measured signal.