A new high-precision forward calorimeter (FoCal) is about to be installed in the ALICE experiment at the LHC during Long Shutdown 3 for data-taking in the LHC Run 4 that is currently scheduled for the period 2030-2033. FoCal consists of a Si+W sampling electromagnetic calorimeter with longitudinal and transverse segmentations (FoCal-E) and a conventional Cu+scintillating-fiber hadronic calorimeter (FoCal-H). FoCal has a front face of approximately 90 $\times$ 90 cm$^2$ and is
placed at z $=$ 7 m from the nominal interaction point. It covers the pseudo-rapidity range of 3.2 $< \eta <$ 5.8. FoCal has unique capabilities to measure the direct photon production at the forward rapidity that probes the gluon distribution in protons and nuclei at small-$x$. Furthermore, FoCal will enable to carry out inclusive and correlation measurements of photons, neutral mesons and jets in hadronic pp and p-Pb collisions aswell as J/𝜓 production in the ultra-peripheral p-Pb and Pb-Pb collisions. We developed a full-length detector prototype and studied its performance such as a response to minimum ionizing particles and a longitudinal shower profile of electromagnetic
showers at the CERN PS and SPS complexes in 2022-2023. We tested the silicon pad sensors for FoCal-E at the RIKEN Accelerator-driven compact neutron systems (RANS) facility in Japan in 2022-2024 and they have the radiation tolerance to withstand the full operation at the LHC Run 4.
Mass production of FoCal will begin soon.