CERN Accelerating science

The first module for the ALICE photon spectrometer has been completed. Each of the five modules will contain 3584 lead-tungstate crystals, a material as transparent as ordinary silica glass but with nearly four times the density. When a high-energy particle passes through one of these crystals it will scintillate, allowing the energy of electrons, positrons and photons to be measured through the 17 920 detection channels.

Le premier module du spectromètre à photons d'ALICE compte 3584 cristaux de tungstate de plomb.

Photograph: Maximilien Brice
Keywords: ALICE; LHC; spectrometre; spectrometer; crystal; Cristaux
Access: DIGITAL
Related links:
CERN Bulletin 19/200620/2006

Available tirages: 01 02 03 04

Download all pictures:small (31.48 KB)large (1.25 MB)original (33.28 MB)