Precise measurements of light yield and transmission of PbWO4 crystals at the INFN-ENEA regional centre
Precise measurements of light yield and transmission of PbWO4 crystals at the INFN-ENEA regional centre
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INFN-ENEA 区域中心对 PbWO4 晶体的光输出和透射率进行精确测量
DOI：
10.1016/j.nima.2006.01.103
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发表时间：
2006
影响因子：
1.4
通讯作者：
R. Paramatti
中科院分区：
文献类型：
--
作者：
L. Barone;F. Cavallari;S. Costantini;I. Dafinei;M. Diemoz;E. Longo;P. Meridiani;M. Obertino;G. Organtini;R. Paramatti
CMS电磁量热计的筒体目前正在建设中，将包含61200个pbwo4晶体。其中一半正在罗马附近的国际电联-中东和非洲区域中心进行尺寸、光学特性和产光量的充分鉴定。本文描述了对约6000个晶体样品的测量和结果。结果表明，光收率和透射率测量的长期稳定性和精度。在350 ~ 370nm范围内，晶体产光率与纵向透射率之间存在很强的相关性。由于不可能用粒子对整个量热计进行预校准，因此在区域中心进行的产光率和透射率测量对于为大多数晶体提供初始的相互校准至关重要。由于观察到的相关性，透射率测量可以与直接光产率测量相结合，以提高晶体间校准精度。推导了对可实现精度的期望。
The barrel of the CMS electromagnetic calorimeter is currently under construction and will contain 61200 PbWO4crystals. 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.