M. Montecchi et Q. Ingram, Study of some optical glues for the Compact Muon Solenoid at the large hadron collider of CERN, NUCL INST A, 465(2-3), 2001, pp. 329-345
Two Avalanche Photodiodes will measure the light produced in each of the 61
,200 PbWO4 crystals composing the barrel part of the electromagnetic calori
meter of the Compact Muon Solenoid (CMS) at the Large Hadron Collider of CE
RN. To improve the collection of the photons, these detectors will be glued
to the crystal. To be used in CMS, the optical glue must fulfil several re
quirements. This paper describes some of those requirements and reports the
results of more general interest achieved during the investigation of seve
ral commercial optical glues. In particular, refractive index, absorption l
ength, radiation hardness and forecast ageing after 15 years are reported.
The most promising glue for CMS was more deeply investigated; its chemical
composition and a method to measure the curing time in realistic conditions
are reported. (C) 2001 Elsevier Science B.V. All rights reserved.