Ms. Olga Dunaeva (P. G. Demidov Yaroslavl State University)
Simulation of the PAMELA spectrometer characteristics is performed now by Geant4 software package (in the PAMELA collaboration), which needs a detailed information about geometry, materials etc. of scientific equipment. This data is taken from manufactures or obtained from different ground-based tests including accelerators. But the characteristics may change a bit during a launch or a long time of operation on the orbit. We propose a method of in-flight correction of calorimeter characteristics. To calculate them we select relativistic particles passing through the calorimeter without interactions and low-energy particles stopping inside it (Bragg curves or stopping power). We obtain correction values from a comparison of various measurements between experimental data and simulation in assumption that electromagnetic processes are performed in Geant4 with high precision. As a result, characteristics of silicon sensors and tungsten absorber of calorimeter are refined. Correction values are within $\approx5\%$ of the original values.