Measurements of the energy spectrum of cascade showers initiated by muons in the Cherenkov water calorimeter NEVOD

The technique of cascade shower energy measurements by means of Cherenkov water detector (CWD) NEVOD with a spatial lattice of quasi-spherical modules (QSM) is discussed. A dense QSM spacing allows to reconstruct the number of cascade particles along the shower axis on the basis of amplitude responses of PMTs. The technique of cascade curve reconstruction was applied to showers generated in water by nearly horizontal high energy muons selected by means of the coordinate detector DECOR deployed around the CWD. First results of cascade energy spectrum measurements are presented.