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The construction of the CMS electromagnetic calorimeter: lead-tungstate (PWO) crystals
APD (Avalanche PhotoDiodes) photodetectors are being glued onto the rear face of PWO (lead tungstate, PbWO4) crystals ready for assembly. Fig. 2 shows a PWO crystal and Fig. 3 five crystals put on a tray to feed the automatic measurement machine. Two APDs are shown on pictures n. 4 and 5.
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2001
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| Acceso en línea: | http://cds.cern.ch/record/929101 |