The aim of the project is to improve the calorimetric performance of heavy PbWO4 proposed by CMS Collaboration (CERN) and NaBi(WO4)2 crystals used at HERMES Collaboration (DESY), especially, their radiation hardness and light yield. It is proposed to study the characteristics of samples of PWO and NBW crystals grown at different conditions and doped with various additives. The main emphasis will be put on increasing the radiation hardness of PWO crystal at low irradiation doses as well as on production of more transparent NBW crystals, and on scintillation doping.

Using new developed crystal growth conditions, the full-size PWO and NBW crystals suitable for assembling prototypes of an electromagnetic calorimeter will be produced. Tests of the prototypes produced will be carried out at a high energy electron beam at DESY.

Monte-Carlo simulations of an alternative solution, provided by the "Shashlyk"-type calorimeter, will be performed. The results from the simulations will be compared to the measurements of the PWO and NBW crystals at a DESY electron beam.