ALICE Forward Calorimeter (FoCal) Upgrade

The Forward Calorimeter (FoCal) is proposed as an upgrade for the ALICE experiment for Run 4 at the LHC to provide new constraints on the small-x gluon structure of the protons and nuclei. Its main goal is the measurement of direct photon production from QCD Compton scattering, while also providing very precise data in neutral meson and jet measurements. FoCal consists of an electromagnetic (FoCal-E) and hadronic calorimeter (FoCal-H). The FoCal-E is a Si-W calorimeter combining digital pixel and analog pad readout in order to maximize both the energy and position resolution of the individual showers. The FoCal-H is a spaghetti-style calorimeter with Cu absorbers and scintillating fibers. In this presentation we report results from beam tests of the prototype detector at the SPS at CERN in 2021 and 2022.