Quality of PWO crystals for the PANDA-EMC

The electromagnetic calorimeter of the target spectrometer of PANDA relies on the high quality of Scintillator material PbWO4. In collaboration with the manufacturer BTCP at Bogoroditsk (Tula district, Russia) a new standard PWO-II was developed. After the approval of the Technical Design Report the final mass production for the forward endcap and part of the barrel has been started immediately. The first stage of quality control, which covers the geometrical dimensions, optical and scintillation properties, is performed similar to the CMS/ECAL project exploiting the semi-automatic robot ACCOS at CERN. The radiation hardness is tested for each crystal at the 60Co irradiation facility at Giessen to guarantee the optimum performance at the final operating temperature of T=-25 C. The report describes in detail the test procedures and summarizes the achieved quality in comparison to the required specification limits for PANDA.