Abstract
The barrel of the CMS electromagnetic calorimeter is currently under construction and will contain 61200 PbWO/sub 4/ crystals. Half of them are being fully characterized for dimensions, optical properties and light yield in the INFN-ENEA Regional Center near Rome. We describe the setup of an automatic quality control system for the crystal measurements and the present results on their qualification, as well as the REDACLE project, which has been developed to control and ease the production process. As it will not be possible to precalibrate the whole calorimeter, the crystal measurements and quality checks performed of the Regional Center will be crucial to provide a basis for fast in-situ calibration with particles. REDACLE is at the same time a fast database and a data managements system, where the database and the workflow structures are decoupled, in order to obtain the best flexibility.
Highlights
The barrel of the CMS [1] electromagnetic calorimeter [2] is currently under construction and will contain 61200 PbWO4 crystals
Crystals are measured in the automatic control machine ACCOR [6]: measurement results are stored in the REDACLE [7] database, which has been developed by the Rome group in order to cope with the complexity of the construction process
The modules are shipped to the CERN Regional Center, where other module types are produced and where sets of four modules are further assembled into so-called supermodules, of 1700 crystals each
Summary
The barrel of the CMS [1] electromagnetic calorimeter [2] is currently under construction and will contain 61200 PbWO4 crystals. It has a pointer to the “characteristic” table, which joins together the pointers to the part barcode, to the list of performed measurements (in this example: light yield values along the crystal length, light yield at eight X0, non-uniformity), as well as to the real data. Unlike what happened with the previous database, even big amounts of data (for instance all measurements belonging to several modules) can be extracted from REDACLE in a negligible time. This provides us with a powerful tool for offline data analysis and long term quality checks. The use of REDACLE has greatly increased the production capability of our Center, allowing us to reach the rate of two modules per month, foreseen for 2004 by the CMS-ECAL production schedule
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