Precise measurements of light yield and transmission of PbWO4 crystals at the INFN-ENEA regional centre
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- 作者：L.M. Barone ; F. Cavallari ; S. Costantini ; I. Dafinei ; M. Diemoz ; E. Longo ; P. Meridiani ; M.M. Obertino ; G. Organtini and R. Paramatti
- 关键词：CMS ; LHC ; Electromagnetic calorimeter ; Scintillating crystals ; Lead tungstate ; Crystal light yield and transmission
- 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- 出版年：2006
- 出版时间：15 June 2006
- 年：2006
- 卷：562
- 期：1
- 页码：76-84
- 全文大小：870 K
文摘
The barrel of the CMS electromagnetic calorimeter is currently under construction and will contain 61 200 me=""mml54"">method=retrieve&_udi=B6TJM-4JB9GPN-C&_mathId=mml54&_user=10&_cdi=5314&_rdoc=11&_handle=V-WA-A-W-ZB-MsSAYVA-UUW-U-AACVDCVEYV-AACWBBCDYV-EYWVUBECB-ZB-U&_acct=C000050221&_version=1&_userid=10&md5=031e29d6b13fc3a9f37366fea04522f1"" title=""Click to view the MathML source"">PbWO4 crystals. Half of them are being fully characterized for dimensions, optical properties and light yield in the INFN-ENEA Regional Centre near Rome. This paper describes the measurements and results from a sample of about 6000 crystals. Results are presented on long term stability and precision of light yield and transmission measurements. A strong correlation between crystal light yield and longitudinal transmission in the range 350–370 nm is observed. As it will not be possible to precalibrate with particles the whole calorimeter, the light yield and transmission measurements performed at the Regional Centre will be crucial to provide an initial intercalibration for most crystals. Thanks to the observed correlation, transmission measurements can be combined with those of direct light yield to improve the crystal intercalibration precision. Expectations on the achievable precision are derived.