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The RADiCAL Collaboration is conducting R\&D on high performanceelectromagnetic (EM) calorimetry to address the challenges expected in futurecollider experiments under conditions of high luminosity and/or highirradiation (FCC-ee, FCC-hh and fixed target and forward physics environments).Under development is a sampling calorimeter approach, known as RADiCAL modules,based on scintillation and wavelength-shifting (WLS) technologies andphotosensor, including SiPM and SiPM-like technology. The modules discussedherein consist of alternating layers of very dense (W) absorber andscintillating crystal (LYSO:Ce) plates, assembled to a depth of 25 $X_0$. Thescintillation signals produced by the EM showers in the region of EM showermaximum (shower max) are transmitted to SiPM located at the upstream anddownstream ends of the modules via quartz capillaries which penetrate the fulllength of the module. The capillaries contain DSB1 organic plastic WLSfilaments positioned within the region of shower max, where the shower energydeposition is greatest, and fused with quartz rod elsewhere. The wavelengthshifted light from this spatially-localized shower max region is thenpropagated to the photosensors. This paper presents the results of an initialmeasurement of the time resolution of a RADiCAL module over the energy range 25GeV $\leq$ E $\leq$ 150 GeV using the H2 electron beam at CERN. The dataindicate an energy dependence of the time resolution that follows thefunctional form: $\sigma_{t} = a/\sqrt{E} \oplus b$, where a = 256$\sqrt{GeV}$~ps and b = 17.5 ps. The time resolution measured at the highestelectron beam energy for which data was currently recorded (150 GeV) was foundto be $\sigma_{t}$ = 27 ps.

Study of time and energy resolution of an ultra-compact sampling  calorimeter (RADiCAL) module at EM shower maximum over the energy range 25  GeV $\leq$ E $\leq$ 150 GeV