Calibrating The Prototype Calorimeter For The Gamma-400 Gamma-Ray Telescope On The Positron Beam At The Pakhra Accelerator

A prototype of the electromagnetic calorimeter for the GAMMA-400 gamma-ray telescope has been calibrated at the Pakhra S-25R electron synchrotron of the Lebedev Physical Institute. The measured energy resolution of the GAMMA-400 calorimeter is consistent with the results of the Monte Carlo simulation. The applicability of the Pakhra S-25R accelerator for calibrating detectors in various experiments has been confirmed.