Cross-calibration of two automatic quality control systems for the CMS ECAL crystals
نویسنده
چکیده
The barrel part of the CMS electromagnetic calorimeter consists of about 60000 Lead Tungstate (PWO) crystals and will be assembled in two Regional Centers, nearby Rome and at CERN. Two automatic machines have been designed to check the crystal quality before assembly. The main crystal characteristics are compared to a set of specifications included in the contract with the crystal producers. The stability and inter-calibration between the two machines is a fundamental issue, which has to be monitored during the whole construction phase. This paper describes the checks that were made in order to cross-calibrate the measurements and to guarantee a proper selection of crystals for the detector. To be submitted to Nucl. Instr. & Meth. A 1 On leave from Universidad de Santiago de Compostela, Santiago de Compostela, Spain
منابع مشابه
CMS ECAL Calibration Strategy
The CMS Electromagnetic crystal Calorimeter (ECAL) must be precisely calibrated if its full potential performance is to be realized. Inter-calibration from laboratory measurements and cosmic ray muons will be available for all crystals and has been demonstrated to give good pre-calibration values at the start-up; some crystals will be also inter-calibrated using an electron beam. In-situ calibr...
متن کاملThe CMS electromagnetic calorimeter
From 2007 the new CERN proton proton collider will start collisions that could open new perspectives in the fields of high energy particle physics. The CMS experiment at the LHC is in advanced construction phase. In particular new physics could be discovered thanks to the CMS precise electromagnetic calorimeter (ECAL) made of about 75000 scintillating PbWO 4 crystals. A description of the ECAL ...
متن کامل A novel approach to automatic position calibration for pixelated crystals in gamma imaging
Introduction: The position estimation in gamma detection system will have constant misplacements which can be corrected in the calibration procedure. In the pixelated crystal uniformly irradiation of detector will produce irregular shape due to position estimation errors. This image is called flood field image and is used to calibrate the position estimation. In this work we pr...
متن کاملMonte Carlo studies on Position Resolution for the CMS ECAL calorimeter
We study the Position Resolution of CMS/ECAL crystals, at Monte Carlo level. Results are presented for two different methods of position determination, the analytical technique of Centre of Gravity and a method based on Neural Networks.
متن کاملNeutron flux Measurement at Tapiro fast reactor for APD’s Irradiation fluence evaluation
The Avalanche Photodiodes (APD) were chosen as photon sensors for the barrel region of the CMS electromagnetic calorimeter. The LHC will be a hard environment for what concerns the radiation levels in the detectors. The most relevant damage on APDs is caused by neutrons that produce an increase in the dark current of these devices. In the CMS-ECAL collaboration a big effort was indeed done to u...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003