Speaker
Description
We report the performance of the CALICE scintillator electromagnetic calorimeter (Sc-ECAL) large prototype measured with 0.5–5.8 GeV electrons at KEK in May–June 2025. Because the calibration LEDs were not operational, we determined single-photo-electron (SPE) gains directly from MIP-like spectra using a frequency/peak-finding method. The calibration chain includes channel-by-channel pedestal subtraction, high/low-gain inter-calibration in the overlap region, SPE-based gain calibration, and MIP equalization with hit selection using a fitted track. We evaluate energy linearity, energy resolution, and temporal stability, and compare the measured performance with a tuned simulation. The results demonstrate a robust calibration approach independent of LED hardware and suitable for long-term operation, providing inputs for Sc-ECAL development for future e⁺e⁻ collider detectors.
