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We present the performance of a full-length prototype of the ALICE ForwardCalorimeter (FoCal). The detector is composed of a silicon-tungstenelectromagnetic sampling calorimeter with longitudinal and transversesegmentation (FoCal-E) of about 20$X_0$ and a hadroniccopper-scintillating-fiber calorimeter (FoCal-H) of about 5$\lambda_{\rm int}$.The data were taken between 2021 and 2023 at the CERN PS and SPS beam lineswith hadron (electron) beams up to energies of 350 (300) GeV. RegardingFoCal-E, we report a comprehensive analysis of its response to minimum ionizingparticles across all pad layers. The longitudinal shower profile ofelectromagnetic showers is measured with a layer-wise segmentation of 1$X_0$.As a projection to the performance of the final detector in electromagneticshowers, we demonstrate linearity in the full energy range, and show that theenergy resolution fulfills the requirements for the physics needs.Additionally, the performance to separate two-showers events was studied byquantifying the transverse shower width. Regarding FoCal-H, we report adetailed analysis of the response to hadron beams between 60 and 350 GeV. Theresults are compared to simulations obtained with a Geant4 model of the testbeam setup, which in particular for FoCal-E are in good agreement with thedata. The energy resolution of FoCal-E was found to be lower than 3% atenergies larger than 100 GeV. The response of FoCal-H to hadron beams was foundto be linear, albeit with a significant intercept that is about factor 2 largerthan in simulations. Its resolution, which is non-Gaussian and generally largerthan in simulations, was quantified using the FWHM, and decreases from about16% at 100 GeV to about 11% at 350 GeV. The discrepancy to simulations, whichis particularly evident at low hadron energies, needs to be furtherinvestigated.

Performance of the electromagnetic and hadronic prototype segments of the ALICE Forward Calorimeter