Monitoring of absolute mirror alignment at COMPASS RICH-1 detector

M. Alexeev; R. Birsa; F. Bradamante; A. Bressan; M. Chiosso; P. Ciliberti; S. Dalla Torre; O. Denisov; V. Duic; A. Ferrero; M. Finger; M. Finger; J. Ch Gayde; M. Giorgi; B. Gobbo; S. Levorato; A. Maggiora; A. Martin; G. Menon; D. Panzieri; G. Pesaro; J. Polak; E. Rocco; G. Sbrizzai; P. Schiavon; M. Slunecka; F. Sozzi; L. Steiger; M. Sulc; S. Takekawa; F. Tessarotto

doi:10.1016/j.nima.2014.06.066

Monitoring of absolute mirror alignment at COMPASS RICH-1 detector

M. Alexeev
, R. Birsa
, F. Bradamante
, A. Bressan
, M. Chiosso
, P. Ciliberti
, S. Dalla Torre
, O. Denisov
, V. Duic
, A. Ferrero
, M. Finger
, M. Finger
, J. Ch Gayde
, M. Giorgi
, B. Gobbo
, S. Levorato
, A. Maggiora
, A. Martin
, G. Menon
, D. Panzieri

G. Pesaro, J. Polak, E. Rocco, G. Sbrizzai, P. Schiavon, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, S. Takekawa, F. Tessarotto

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	208-211
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	766
DOIs	https://doi.org/10.1016/j.nima.2014.06.066
Publication status	Published - 1 Dec 2014
Externally published	Yes

Keywords

Cherenkov radiation
Mirror alignment
Photogrammetry
RICH

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10.1016/j.nima.2014.06.066

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Alexeev, M., Birsa, R., Bradamante, F., Bressan, A., Chiosso, M., Ciliberti, P., Dalla Torre, S., Denisov, O., Duic, V., Ferrero, A., Finger, M., Finger, M., Gayde, J. C., Giorgi, M., Gobbo, B., Levorato, S., Maggiora, A., Martin, A., Menon, G., ... Tessarotto, F. (2014). Monitoring of absolute mirror alignment at COMPASS RICH-1 detector. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 766, 208-211. https://doi.org/10.1016/j.nima.2014.06.066

@article{6c482b8fd733428ab33aa4aadf1822bd,

title = "Monitoring of absolute mirror alignment at COMPASS RICH-1 detector",

abstract = "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.",

keywords = "Cherenkov radiation, Mirror alignment, Photogrammetry, RICH",

author = "M. Alexeev and R. Birsa and F. Bradamante and A. Bressan and M. Chiosso and P. Ciliberti and \{Dalla Torre\}, S. and O. Denisov and V. Duic and A. Ferrero and M. Finger and M. Finger and Gayde, \{J. Ch\} and M. Giorgi and B. Gobbo and S. Levorato and A. Maggiora and A. Martin and G. Menon and D. Panzieri and G. Pesaro and J. Polak and E. Rocco and G. Sbrizzai and P. Schiavon and M. Slunecka and F. Sozzi and L. Steiger and M. Sulc and S. Takekawa and F. Tessarotto",

year = "2014",

month = dec,

day = "1",

doi = "10.1016/j.nima.2014.06.066",

language = "English",

volume = "766",

pages = "208--211",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

issn = "0168-9002",

publisher = "Elsevier BV",

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Alexeev, M, Birsa, R, Bradamante, F, Bressan, A, Chiosso, M, Ciliberti, P, Dalla Torre, S, Denisov, O, Duic, V, Ferrero, A, Finger, M, Finger, M, Gayde, JC, 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 2014, 'Monitoring of absolute mirror alignment at COMPASS RICH-1 detector', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 766, pp. 208-211. https://doi.org/10.1016/j.nima.2014.06.066

TY - JOUR

T1 - Monitoring of absolute mirror alignment at COMPASS RICH-1 detector

AU - Alexeev, M.

AU - Birsa, R.

AU - Bradamante, F.

AU - Bressan, A.

AU - Chiosso, M.

AU - Ciliberti, P.

AU - Dalla Torre, S.

AU - Denisov, O.

AU - Duic, V.

AU - Ferrero, A.

AU - Finger, M.

AU - Gayde, J. Ch

AU - Giorgi, M.

AU - Gobbo, B.

AU - Levorato, S.

AU - Maggiora, A.

AU - Martin, A.

AU - Menon, G.

AU - Panzieri, D.

AU - Pesaro, G.

AU - Polak, J.

AU - Rocco, E.

AU - Sbrizzai, G.

AU - Schiavon, P.

AU - Slunecka, M.

AU - Sozzi, F.

AU - Steiger, L.

AU - Sulc, M.

AU - Takekawa, S.

AU - Tessarotto, F.

PY - 2014/12/1

Y1 - 2014/12/1

N2 - 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.

AB - 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.

KW - Cherenkov radiation

KW - Mirror alignment

KW - Photogrammetry

KW - RICH

UR - https://www.scopus.com/pages/publications/84910038726

U2 - 10.1016/j.nima.2014.06.066

DO - 10.1016/j.nima.2014.06.066

M3 - Article

SN - 0168-9002

VL - 766

SP - 208

EP - 211

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ER -

Monitoring of absolute mirror alignment at COMPASS RICH-1 detector

Abstract

Keywords

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