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Determination of the performance of the full liquid argon en-cap calorimeter of the atlas detector

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Two INTAS member teams and four NIS teams, all with experience in cryogenic calorimeters, have been working since five years on the development of the EMEC and HEC calorimeters for the ATLAS detectors.
New approaches in design are foreseen to meet the harsh operational conditions at the LHC. Such are the accordion type lead absorber for the EMEC and the electrostatic transformer scheme of the readout electrode structure and the GaAs front-end electronics operational in LAr for the HEC. For the realization many high-tech solutions were implemented. Since such technologies have not been used in high energy experiments before, thorough testing of the mechanical reliability and good understanding of their physics performance is needed prior to the installation as part of the ATLAS detector. For this purpose prototypes of the EMEC and HEC modules were constructed and subjected to mechanical and electrical tests. Specialized front-end electronics has been developed. The required hard- and software to test the prototypes in high-energy beams at CERN has been developed. The prototype stacks were exposed to electrons and pions in the energy range 10 < E < 200GeV. The analysis of the data obtained confirmed that the new technologies implemented in the EMEC and HEC designs are performing according to specifications. Following the prototypes the "module 0" type modules have been constructed. The related beam tests allowed obtaining more detailed information on the stand-alone performance of the EMEC and the HEC. But for the final test of these calorimeters with respect to the request to meet the LHC challenges when operated in ATLAS a combined test in high-energy beams is absolutely necessary. This requires merging the efforts of the EMEC and HEC teams. This can be done optimally in the framework of a well-defined project with a co-ordinator, timetable and additional resources to finance the new activities. INTAS-Call 1999 presents an excellent opportunity to facilitate the realization of such a project.

When carrying out this project the auxiliary equipment needed for the realization of the combined test will be designed and produced. The related EMEC and HEC modules for the combined set-up will be assembled, tested and exposed to high-energy electron and pion beams. The use of the existing HEC liquid argon cryostat and of the cryogenic equipment, developed in the North Area of CERN, together with the equipment installed and tested in the H6 beam line, will help to facilitate this task. The appropriate software for the data acquisition and analysis will be developed. The analysis of the data will yield the intercalibration constants of the individual calorimeters. Further the expected energy and special resolution for hadron jets will be determined. The impact of intermodule gaps and other inactive regions will be investigated and methods to correct the corresponding energy losses will be elaborated. Final engineering problems related to the wheel assembly and interference between the wheels of various calorimeter types will be solved.

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Max Plank Institute for Physics
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Letzte Aktualisierung: 30 Oktober 2002

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Permalink: https://cordis.europa.eu/project/id/INTAS-1999-00278/de

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