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Iterative local Chi2 alignment approach for the ATLAS SCT detector
An approach for the alignment of SCT modules in the ATLAS Inner Detector with particle tracks was developed and implemented in the ATLAS software framework Athena. The approach uses distance of closest approach residuals and a linear least squares minimization to derive the most probable set of alig...
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Lenguaje: | eng |
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2013
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Acceso en línea: | http://cds.cern.ch/record/1511044 |
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author | Härtel, Roland |
author_facet | Härtel, Roland |
author_sort | Härtel, Roland |
collection | CERN |
description | An approach for the alignment of SCT modules in the ATLAS Inner Detector with particle tracks was developed and implemented in the ATLAS software framework Athena. The approach uses distance of closest approach residuals and a linear least squares minimization to derive the most probable set of alignment parameters for each module. The procedure is iterative, i.e. with the first set of alignment constants a track refit is done and the alignment algorithm is repeated. Correlations between modules are only implicitly taken into account due to the improvement of track parameters through the iterations. A derivation of the underlying concepts is presented. The achievable accuracy and limits of the alignment approach were studied with Monte Carlo simulated tracks in the Athena framework. The results and limitations obtained with the present versions of Athena and the proposed alignment software are presented. |
id | cern-1511044 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2013 |
record_format | invenio |
spelling | cern-15110442019-09-30T06:29:59Zhttp://cds.cern.ch/record/1511044engHärtel, RolandIterative local Chi2 alignment approach for the ATLAS SCT detectorDetectors and Experimental TechniquesAn approach for the alignment of SCT modules in the ATLAS Inner Detector with particle tracks was developed and implemented in the ATLAS software framework Athena. The approach uses distance of closest approach residuals and a linear least squares minimization to derive the most probable set of alignment parameters for each module. The procedure is iterative, i.e. with the first set of alignment constants a track refit is done and the alignment algorithm is repeated. Correlations between modules are only implicitly taken into account due to the improvement of track parameters through the iterations. A derivation of the underlying concepts is presented. The achievable accuracy and limits of the alignment approach were studied with Monte Carlo simulated tracks in the Athena framework. The results and limitations obtained with the present versions of Athena and the proposed alignment software are presented.CERN-THESIS-2005-101MPP-2005-174oai:cds.cern.ch:15110442013-01-30T14:48:09Z |
spellingShingle | Detectors and Experimental Techniques Härtel, Roland Iterative local Chi2 alignment approach for the ATLAS SCT detector |
title | Iterative local Chi2 alignment approach for the ATLAS SCT detector |
title_full | Iterative local Chi2 alignment approach for the ATLAS SCT detector |
title_fullStr | Iterative local Chi2 alignment approach for the ATLAS SCT detector |
title_full_unstemmed | Iterative local Chi2 alignment approach for the ATLAS SCT detector |
title_short | Iterative local Chi2 alignment approach for the ATLAS SCT detector |
title_sort | iterative local chi2 alignment approach for the atlas sct detector |
topic | Detectors and Experimental Techniques |
url | http://cds.cern.ch/record/1511044 |
work_keys_str_mv | AT hartelroland iterativelocalchi2alignmentapproachfortheatlassctdetector |