Tracker alignment Carlo Ferrari Marco Incagli Maurizio Massa
- Slides: 12
Tracker alignment Carlo Ferrari, Marco Incagli, Maurizio Massa, Andrea Moggi INFN Pisa 24 June 2020 1 24/06/2020 Muone tracker mechanics
Tasks: • Align the tracker station to the beam • Scan the tilt (X and Y) of the station to optimize the «effective staggering» • Study the Pt 2 s modules curvature => We need 5 degrees of freedom (position along Z does not change) • Two options: i) UAP from CERN ; ii) Homemade AP using linear stages 2 24/06/2020 Muone tracker mechanics
UAP from CERN • Optimized design • Design not yet finalized • Manual control • Cost: 5 k. Euro/tracker station 3 24/06/2020 Muone tracker mechanics
UAP from CERN 4 24/06/2020 Muone tracker mechanics
Homemade alignment system • Based on linear stages • Simpler design • Motorized control • Software development required • Cost: > 3 k. Euro/tracker station linear stages coupled with 2 right-angle bracket) 5 24/06/2020 Muone tracker mechanics (5
Homemade alignment system Three points of support Linear stages: • XY upstream • downstream: XY and X Max axial load 700 N 6 24/06/2020 Muone tracker mechanics X Z Y
Kinematic aligment Different thermal expansion coefficients 7 24/06/2020 Muone tracker mechanics
Upstream support XY linear stages upstream Spherical joint 8 24/06/2020 Muone tracker mechanics The sphere allows rotation The translation is prevented
Downstream supports 9 24/06/2020 Muone tracker mechanics
Aligment procedure 1) Raw alignment to the beam 2) Leveling the station w/o beam 3) Beam ON: data acquisition & analysis 4) Center of the layer upstream: Module X and Y of upstream layer will guide linear stages X and Y respectively 5) Center of the layer downstream: Module X and Y of downstream layer will guide linear stages X and Y respectively (of the XY stages) 6) Rotation: move the whole station along X (and Y) and adjust the X stage downsteam accordingly 7) Repeat from 3) 8) Small angles tilt scan (X and Y) to optimize the «effective staggering» 9) Position survey from CERN (temperature issue) 10 24/06/2020 Muone tracker mechanics X Z Y Single motor step is 5 mm
Pt 2 s modules curvature There are 12 modules we can use to obtain data on the curvature of the modules The maximum travel distance of the linear stage can be chosen at will, whithin limits (100 mm) The maximum tilt angle (X and Y axes) will be: (travel distance [mm])*2 m. Rad Modules movements are quite complex: rototranslations + tilted modules The step angle will be 5 m. Rad 11 24/06/2020 Muone tracker mechanics 50 mm
Conclusions 1) We have two ongoing alternatives: UAP from CERN, homemade AP 2) Prototype of the homemade AP by the end of the year 3) Some software work to control the step motors 4) The alignment procedure must be optimized 5) Max tilt angles to study the silicon module curvature is < 200 m. Rad (safer < 100 m. Rad) 12 24/06/2020 Muone tracker mechanics
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