Studies of the optics response of Steel-plastic scintillator calorimeters for the ATLAS detector and checks of lights sources for their quality control

During 1998 a full scale prototype module equipped almost as in the final ATLAS design, has been constructed and tested. The light yield of this prototype as well as for previous prototypes built in 1996 and 1997 showed some small irregularities that were not understood. A TILECAL prototype was built to find out which might have been the reason for them. This was also used to check if a LED would be suitable for the quality control (QC) during the production of TILECAL modules. The aim of this work is to show that the LED system satisfies the requirements for the TILECAL QC and to exploit the information that the data from this system as well as from the Cs calibration system gives about the light yield of the calorimeter. Also, some MonteCarlo studies of disuniformities in the calorimeter, which would affect the energy resolution, will be made.