|Validation tests of the slats positioning system with photogrammetric measurements|
|M. Anfreville, A. Baldisseri, H. Borel, D. Desforge, E. Dumonteil, P. de Girolamo, J. Gosset, P. Hardy, F. Orsini, Y. Penichot, F. Staley|
The slats of Stations 3-4-5 of the ALICE Dimuon Arm need to be localized in the three directions with a very good precision (x, y ~ 50 microns, z ~ 100 microns). It could be useful to apply some angular corrections in the slat positioning and a special mechanical device has been designed and realized for that. It allows small adjustments of each slat from 0.1 mm to 2 mm in each direction. This document presents the slats positioning system, its mechanical design, its working principle and all the tests performed with the system on a mock up of the central part of Station 5. The mechanical validation of the positioning system is done at first with a comparator and then with photogrammetric measurements. The results are discussed and conclusions on the device efficiency are given.