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We propose an experiment to perform a systematic study of charm production in heavy ion collisions at SPS. Taking advantage of significant advances in electromagnetic calorimetry, the measurement of low energy photons from χc decays should now be achievable. Together with recent measurements made at RHIC and at LHC on J/ψ and Υ production, such measurements will offer the necessary information to use quarkonia as a direct test of phase transition and lattice QCD calculations. This new and dedicated experiment is designed to also study, under optimal conditions, Cold Nuclear Matter (CNM) effects in a larger rapidity range than previously explored by the NA50/NA60 experiments. This measurement of nuclear effects in absence of Quark Gluon Plasma formation will provide a clear and unambiguous reference for the study of Hot and Dense Matter (HDM) effects, a reference which is today needed to deduce an unambiguous interpretation of the results already obtained.

CHIC (Charm in Heavy Ion Collisions): An experiment to measure charm production at the CERN SPS