Software Alignment of the CMS Tracker using MILLEPEDE II

The Alignment of the CMS tracker will require to determine about 10^5 alignment parameters. The Millepede program, a linear least-squares algorithm, is a promising candidate for this task, having been used successfully for alignment in several experiments. However, due to the inversion of a large ma...

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Detalles Bibliográficos
Autores principales: Schleper, Peter, Steinbrueck, G, Stoye, Markus
Lenguaje:eng
Publicado: 2006
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/926543
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author Schleper, Peter
Steinbrueck, G
Stoye, Markus
author_facet Schleper, Peter
Steinbrueck, G
Stoye, Markus
author_sort Schleper, Peter
collection CERN
description The Alignment of the CMS tracker will require to determine about 10^5 alignment parameters. The Millepede program, a linear least-squares algorithm, is a promising candidate for this task, having been used successfully for alignment in several experiments. However, due to the inversion of a large matrix of linear equations, Millepede in its original form was limited to problems with about 10000 parameters. A new version of the program, Millepede II, provides an iterative method to determine the solution of the matrix, which should work for systems with 100000 parameters, if the matrix is sparse. This method is tested within the CMS object oriented reconstruction framework (ORCA). Its precision and CPU needs are studied and compared to the inversion method, using alignment scenarios of the CMS tracker with currently up to 12000 parameters.
id cern-926543
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2006
record_format invenio
spelling cern-9265432019-09-30T06:29:59Zhttp://cds.cern.ch/record/926543engSchleper, PeterSteinbrueck, GStoye, MarkusSoftware Alignment of the CMS Tracker using MILLEPEDE IIDetectors and Experimental TechniquesThe Alignment of the CMS tracker will require to determine about 10^5 alignment parameters. The Millepede program, a linear least-squares algorithm, is a promising candidate for this task, having been used successfully for alignment in several experiments. However, due to the inversion of a large matrix of linear equations, Millepede in its original form was limited to problems with about 10000 parameters. A new version of the program, Millepede II, provides an iterative method to determine the solution of the matrix, which should work for systems with 100000 parameters, if the matrix is sparse. This method is tested within the CMS object oriented reconstruction framework (ORCA). Its precision and CPU needs are studied and compared to the inversion method, using alignment scenarios of the CMS tracker with currently up to 12000 parameters.CMS-NOTE-2006-011oai:cds.cern.ch:9265432006-01-20
spellingShingle Detectors and Experimental Techniques
Schleper, Peter
Steinbrueck, G
Stoye, Markus
Software Alignment of the CMS Tracker using MILLEPEDE II
title Software Alignment of the CMS Tracker using MILLEPEDE II
title_full Software Alignment of the CMS Tracker using MILLEPEDE II
title_fullStr Software Alignment of the CMS Tracker using MILLEPEDE II
title_full_unstemmed Software Alignment of the CMS Tracker using MILLEPEDE II
title_short Software Alignment of the CMS Tracker using MILLEPEDE II
title_sort software alignment of the cms tracker using millepede ii
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/926543
work_keys_str_mv AT schleperpeter softwarealignmentofthecmstrackerusingmillepedeii
AT steinbrueckg softwarealignmentofthecmstrackerusingmillepedeii
AT stoyemarkus softwarealignmentofthecmstrackerusingmillepedeii

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