Precise measurements of light yield and transmission of PbWO4 crystals at the INFN-ENEA regional centre

被引：5
作者：
Barone, L. M.
Cavallari, F.
Costantini, S. [1 ]
Dafinei, I.
Diemoz, M.
Longo, E.
Meridiani, P.
Obertino, M. M.
Organtini, G.
Paramatti, R.
机构：
[1] Ist Nazl Fis Nucl, Sez Roma, Rome, Italy
[2] Univ Roma La Sapienza, Rome, Italy
[3] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
[4] Univ Turin, Turin, Italy
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2006年 / 562卷 / 01期
关键词：
CMS; LHC; electromagnetic calorimeter; scintillating crystals; lead tungstate; crystal light yield and transmission;
D O I：
10.1016/j.nima.2006.01.103
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The barrel of the CMS electromagnetic calorimeter is currently under construction and will contain 61200 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 350-370nm 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. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：76 / 84
页数：9
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