Alignment of the ALICE inner tracking system with cosmic-ray tracks

K.  Aamodt...[et al.]; Ian Bearden; Hans Bøggild; Christian Holm Christensen; Jens Jørgen Gaardhøje; Hans Hjersing Dalsgaard; Casper Nygaard; Børge Svane Nielsen; Gaël Renault; Carsten Søgaard

doi:10.1088/1748-0221/5/03/P03003

Alignment of the ALICE inner tracking system with cosmic-ray tracks

K. Aamodt...[et al.], Ian Bearden, Hans Bøggild, Christian Holm Christensen, Jens Jørgen Gaardhøje, Hans Hjersing Dalsgaard, Casper Nygaard, Børge Svane Nielsen, Gaël Renault, Carsten Søgaard

159 Citations (Scopus)

Abstract

ALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 μm in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from protonproton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10 ⁵ charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.

Original language	English
Journal	Journal of Instrumentation
Volume	5
Pages (from-to)	P03003
ISSN	1748-0221
DOIs	https://doi.org/10.1088/1748-0221/5/03/P03003
Publication status	Published - 10 Mar 2010

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@inproceedings{2789e53b366c40b78a07f420843c6d47,

title = "Alignment of the ALICE inner tracking system with cosmic-ray tracks",

abstract = "ALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 μm in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from protonproton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10 5 charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.",

author = "{Aamodt...[et al.]}, K. and Ian Bearden and Hans B{\o}ggild and Christensen, {Christian Holm} and Gaardh{\o}je, {Jens J{\o}rgen} and Dalsgaard, {Hans Hjersing} and Casper Nygaard and Nielsen, {B{\o}rge Svane} and Ga{\"e}l Renault and Carsten S{\o}gaard",

year = "2010",

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doi = "10.1088/1748-0221/5/03/P03003",

language = "English",

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T1 - Alignment of the ALICE inner tracking system with cosmic-ray tracks

AU - Aamodt...[et al.], K.

AU - Bearden, Ian

AU - Bøggild, Hans

AU - Christensen, Christian Holm

AU - Gaardhøje, Jens Jørgen

AU - Dalsgaard, Hans Hjersing

AU - Nygaard, Casper

AU - Nielsen, Børge Svane

AU - Renault, Gaël

AU - Søgaard, Carsten

PY - 2010/3/10

Y1 - 2010/3/10

N2 - ALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 μm in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from protonproton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10 5 charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.

AB - ALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 μm in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from protonproton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10 5 charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.

U2 - 10.1088/1748-0221/5/03/P03003

DO - 10.1088/1748-0221/5/03/P03003

M3 - Conference article

SN - 1748-0221

VL - 5

SP - P03003

JO - Journal of Instrumentation

JF - Journal of Instrumentation

ER -

Alignment of the ALICE inner tracking system with cosmic-ray tracks

Abstract

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