E. Auffray et al., BEAM TESTS OF LEAD TUNGSTATE CRYSTAL MATRICES AND A SILICON STRIP PRESHOWER DETECTOR FOR THE CMS ELECTROMAGNETIC CALORIMETER, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 412(2-3), 1998, pp. 223-237
Further tests of lead tungstate crystal matrices made in high-energy e
lectron beams in 1996, using new crystals, new APDs and an improved te
st setup confirm that an energy resolution of better than 0.6% at 100
GeV can be obtained when the longitudinal uniformity of the struck cry
stal is adequate. Light loss measurements under low dose irradiation a
re reported. It is shown that there is no loss of energy resolution af
ter irradiation and it is demonstrated that the calibration change due
to light loss can be tracked with a precision monitoring system. Succ
essful tests with a preshower device, equipped with a silicon strip de
tector readout. are also described. (C) 1998 Elsevier Science B.V. All
rights reserved.