Objective PbW04 single crystals possess a number of unique properties required for high energy calorimetry. These crystals have a density of 8.28 g/cm3 and exhibit a fast scintillation with a luminescence spectrum located in the visible region. The perspectives for broad applications of lead tungstate scintillators stimulate further investigations of this crystal and development of its technology. First results already obtained have shown that it is becoming a very serious candidate for LHC experiments. Moreover it has been found that the characteristics of PbW04 scintillating crystals could be improved to extend their use to rather low energy and to other fields like medicine, astrophysics and high technology ionizing detectors. The main aim of this research project is to improve the growing technology and the characteristics of PbW04 scintillators such as light yield, radiation hardness and other basic properties, and to allow wide application in the fields mentioned above. More precise determination of the origin of the radiating centres and their energy levels will be investigated as well as energy transfer processes between them. The influence of additional doping such as Nb, Ca, Mo on the amount of green luminescence centres in the crystal will be studied as well as investigation of the paramagnetic centres such as Pb3+ by ESR method to determine the role of these ions in energy transfer processes, and determination of the energy level diagram to help optimize the energy transfer processes in PbW04 scintillators. Light yield improvement will be achieved by an attempt to increase the amount of green luminescence radiating centres in the crystals and to control the homogeneity of their spatial distribution along the crystal. This goal will be accomplished through further technological research on different crystal growth conditions and spectroscopic investigations of the crystal. The influence of doping on the amount of colour centres as well as radiation hardness will be investigated under g rays and neutron-irradiation of different energies and dose rate: radiation damages of PW0 crystal under slow neutrons doses for different accumulation rates (fast and slow), radiation damages of PW0 crystal under fast neutrons doses also at different accumulation rates, radiation damages induced by soft g rays (1.2 Me V) in slow and fast accumulation rates, investigation of the self recovery properties after irradiation without external action, and exploration of optimum means to recover the radiation damages as quickly as possible. For the light collection optimization of the wrapping material of the crystal to minimize the light losses on the faces without photo detectors, studies of the influence of the shape of the crystal on light collection efficiency, and optimization of the optical coupling with the photo detector will be made. Programme(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Topic(s) 13 - High Energy Physics Call for proposal Data not available Funding Scheme Data not available Coordinator Centre National de la Recherche Scientifique EU contribution No data Address Chemin de Bellevue 10 74941 Annecy-Le-Vieux France See on map Total cost No data Participants (4) Sort alphabetically Sort by EU Contribution Expand all Collapse all Institute of High Energy Physics Serpukhov Russia EU contribution No data Address 142284 Protvino, Moscow Region See on map Total cost No data Institute of Nuclear Problems Belarus EU contribution No data Address 220050 Minsk See on map Total cost No data Radiation Instruments and New Components Co. Ltd. Belarus EU contribution No data Address 220050 Minsk See on map Total cost No data Université Libre de Bruxelles Belgium EU contribution No data Address 1050 Bruxelles See on map Total cost No data
