Monitoring of absolute mirror alignment at COMPASS RICH-1 detector

0435037 - ÚFP 2015 RIV NL eng J - Článek v odborném periodiku
Alexeev, M. - Birsa, R. - Bradamante, F. - Bressan, A. - Chiosso, M. - Ciliberti, P. - Dalla Torre, S. - Denisov, O. - Duic, V. - Ferrero, A. - Finger, M. - Finger jr., M. - Gayde, J.Ch. - Giorgi, M. - Gobbo, B. - Levorato, S. - Maggiora, A. - Martin, A. - Menon, G. - Panzieri, D. - Pesaro, G. - Polák, Jaroslav - Rocco, E. - Sbrizzai, G. - Schiavon, P. - Slunečka, M. - Sozzi, F. - Steiger, Lukáš - Šulc, Miroslav - Takekawa, S. - Tessarotto, F.
Monitoring of absolute mirror alignment at COMPASS RICH-1 detector.
Nuclear Instruments & Methods in Physics Research Section A. Roč. 766, December (2014), s. 208-211. ISSN 0168-9002. E-ISSN 1872-9576.
[International Workshop on Ring Imaging Cherenkov Detectors (RICH 2013)/8./. Hayama, Kanagawa, 02.12.2013-06.12.2013]
Institucionální podpora: RVO:61389021
Klíčová slova: RICH * Cherenkov radiation * Mirror alignment * Photogrammetry
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 1.216, rok: 2014
http://www.sciencedirect.com/science/article/pii/S0168900214008134#

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
Trvalý link: http://hdl.handle.net/11104/0238955