Tools for the inspection of PWO//APD gluing
نویسندگان
چکیده
The light produced in each of the 60 thousand PbWO4 (PWO) crystals of the CMS barrel electromagnetic calorimeter will be readout by Avalanche Photodiodes (APD). The ratio detected to emitted photons also depends on the PWO//APD gluing quality that must be checked before the crystal mounting inside the calorimeter. In this paper two different tools are proposed: one for the visual inspection of the glue layer and the other for the quantitative evaluation of transmittance improvement when the glue replaces the air at the PWO//APD interface. Both the instruments are rugged and cheap. A sequence of operations and checks to be done in the Regional Centres is proposed.
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