Monitoring of absolute mirror alignment at COMPASS RICH-1 detector

The gaseous COMPASS RICH-1 detector uses two spherical mirror surfaces, segmented into 116 individual mirrors, to focus the Cherenkov photons onto the detector plane. Any mirror misalignment directly affects the detector resolution. The on-line Continuous Line Alignment and Monitoring (CLAM) photogr...

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Autores principales: Alexeev, M, Birsa, R, Bradamante, F, Bressan, A, Chiosso, M, Ciliberti, P, Dalla Torre, S, Denisov, O, Duic, V, Ferrero, A, Finger, M, Gayde, J Ch, Giorgi, M, Gobbo, B, Levorato, S, Maggiora, A, Martin, A, Menon, G, Panzieri, D, Pesaro, G, Polak, J, Rocco, E, Sbrizzai, G, Schiavon, P, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Takekawa, S, Tessarotto, F
Lenguaje:eng
Publicado: 2014
Materias:
Detectors and Experimental Techniques
Acceso en línea:https://dx.doi.org/10.1016/j.nima.2014.06.066
http://cds.cern.ch/record/2014688
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author Alexeev, M
Birsa, R
Bradamante, F
Bressan, A
Chiosso, M
Ciliberti, P
Dalla Torre, S
Denisov, O
Duic, V
Ferrero, A
Finger, M
Gayde, J Ch
Giorgi, M
Gobbo, B
Levorato, S
Maggiora, A
Martin, A
Menon, G
Panzieri, D
Pesaro, G
Polak, J
Rocco, E
Sbrizzai, G
Schiavon, P
Slunecka, M
Sozzi, F
Steiger, L
Sulc, M
Takekawa, S
Tessarotto, F
author_facet Alexeev, M
Birsa, R
Bradamante, F
Bressan, A
Chiosso, M
Ciliberti, P
Dalla Torre, S
Denisov, O
Duic, V
Ferrero, A
Finger, M
Gayde, J Ch
Giorgi, M
Gobbo, B
Levorato, S
Maggiora, A
Martin, A
Menon, G
Panzieri, D
Pesaro, G
Polak, J
Rocco, E
Sbrizzai, G
Schiavon, P
Slunecka, M
Sozzi, F
Steiger, L
Sulc, M
Takekawa, S
Tessarotto, F
author_sort Alexeev, M
collection CERN
description The gaseous COMPASS RICH-1 detector uses two spherical mirror surfaces, segmented into 116 individual mirrors, to focus the Cherenkov photons onto the detector plane. Any mirror misalignment directly affects the detector resolution. The on-line Continuous Line Alignment and Monitoring (CLAM) photogrammetry-based method has been implemented to measure the alignment of individual mirrors which can be characterized by the center of curvature. The mirror wall reflects a regular grid of retroreflective strips placed inside the detector vessel. Then, the position of each mirror is determined from the image of the grid reflection. The images are collected by four cameras. Any small mirror misalignment results in changes of the grid lines’ positions in the image. The accuracy limits of the CLAM method were checked by laser interferometry and are below 0.1 mrad.
id oai-inspirehep.net-1326743
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2014
record_format invenio
spelling oai-inspirehep.net-13267432022-08-10T20:35:57Zdoi:10.1016/j.nima.2014.06.066http://cds.cern.ch/record/2014688engAlexeev, MBirsa, RBradamante, FBressan, AChiosso, MCiliberti, PDalla Torre, SDenisov, ODuic, VFerrero, AFinger, MGayde, J ChGiorgi, MGobbo, BLevorato, SMaggiora, AMartin, AMenon, GPanzieri, DPesaro, GPolak, JRocco, ESbrizzai, GSchiavon, PSlunecka, MSozzi, FSteiger, LSulc, MTakekawa, STessarotto, FMonitoring of absolute mirror alignment at COMPASS RICH-1 detectorDetectors and Experimental TechniquesThe gaseous COMPASS RICH-1 detector uses two spherical mirror surfaces, segmented into 116 individual mirrors, to focus the Cherenkov photons onto the detector plane. Any mirror misalignment directly affects the detector resolution. The on-line Continuous Line Alignment and Monitoring (CLAM) photogrammetry-based method has been implemented to measure the alignment of individual mirrors which can be characterized by the center of curvature. The mirror wall reflects a regular grid of retroreflective strips placed inside the detector vessel. Then, the position of each mirror is determined from the image of the grid reflection. The images are collected by four cameras. Any small mirror misalignment results in changes of the grid lines’ positions in the image. The accuracy limits of the CLAM method were checked by laser interferometry and are below 0.1 mrad.oai:inspirehep.net:13267432014
spellingShingle Detectors and Experimental Techniques
Alexeev, M
Birsa, R
Bradamante, F
Bressan, A
Chiosso, M
Ciliberti, P
Dalla Torre, S
Denisov, O
Duic, V
Ferrero, A
Finger, M
Gayde, J Ch
Giorgi, M
Gobbo, B
Levorato, S
Maggiora, A
Martin, A
Menon, G
Panzieri, D
Pesaro, G
Polak, J
Rocco, E
Sbrizzai, G
Schiavon, P
Slunecka, M
Sozzi, F
Steiger, L
Sulc, M
Takekawa, S
Tessarotto, F
Monitoring of absolute mirror alignment at COMPASS RICH-1 detector
title Monitoring of absolute mirror alignment at COMPASS RICH-1 detector
title_full Monitoring of absolute mirror alignment at COMPASS RICH-1 detector
title_fullStr Monitoring of absolute mirror alignment at COMPASS RICH-1 detector
title_full_unstemmed Monitoring of absolute mirror alignment at COMPASS RICH-1 detector
title_short Monitoring of absolute mirror alignment at COMPASS RICH-1 detector
title_sort monitoring of absolute mirror alignment at compass rich-1 detector
topic Detectors and Experimental Techniques
url https://dx.doi.org/10.1016/j.nima.2014.06.066
http://cds.cern.ch/record/2014688
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