Tools for the Inspection of PWO//APD Gluing

The light produced in each of the 60 thousand 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 in the calorime...

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Detalles Bibliográficos
Autores principales: Baccaro, Stefania, Borgia, Bruno, Cavallari, Francesca, Dafinei, Ioan, Diemoz, Marcella, Longo, Egidio, Montecchi, Marco, Organtini, Giovanni
Lenguaje:eng
Publicado: 1998
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/687014
Descripción
Sumario:The light produced in each of the 60 thousand 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 in 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 on the gluing to be done in the Regional Centres is proposed.

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