OT Survey & Adjustment 06-03-2007 Outline: Survey technique at present what has been done and what there is to do issues to complete OT alignment before pilot run possible optimizations long-term maintainance

Open Position Modules Bridge C-frame OT Cryo-Platform Table & Cable Trays December 9, 2018 Antonio Pellegrino

C Frames Distribution of cooling and gas Front-End Electronics Boxes Detector Modules Distribution of LV,HV, ECS/TFC, etc. December 9, 2018 Antonio Pellegrino

C-Frame Survey 1 2 3 4 5 6 7 8 9 Survey Points: 2(X/U) x 2(T/B) x 9 Per point: two targets for position & distance ~1 day per C-frame December 9, 2018 Antonio Pellegrino

Wheeled Support, Alignment, and Stop-and-Lock Blocks C-Frame Adjustment Long Beams (IPE 300) Transversal Beams C-Frame Rails Wheeled Support, Alignment, and Stop-and-Lock Blocks December 9, 2018 Antonio Pellegrino

Survey Work All data available at: Surveyed completely 4 out of 6 C-Frames (C Side) Work took usually 2-3 days of work 1st survey (1 day) Adjustment (~0.5 day) 2nd survey (1 day) Work needed OT closed (hindered by beam-pipe ) survey people inside the magnet (no longer possible? ) scaffold inside the detector to (major shit! ) insert targets at the top adjust the C Frame through alignment mechanism All data available at: http://www.nikhef.nl/pub/experiments/bfys/lhcb/outerTracker/Installation/Survey/Overview.html December 9, 2018 Antonio Pellegrino

Achieved so far T2-Q02-XU X layer top and bottom no survey of U layer T2-Q02-VX V layer top and bottom X layer bottom only T1-Q02-XU 1 corner X layer bottom 2 points U layer top and bottom T1-Q02-VX (1st survey, adjustment, then 2nd survey) V layer only bottom T3-Q02-XU & T3-Q02-VX only corners for RASNIK installation {T1,T2,T3}-Q13-{XU,VX} no survey yet December 9, 2018 Antonio Pellegrino

Problems to be solved Completion of OT alignment before pilot run: Close OT or at least come into the region of the alignment blocks access magnet area for survey access top dowel pins for survey target installation access alignment mechanism to adjust C-Frame position “Maintain” the OT alignment (long-term): access magnet area for survey access top dowel pins for survey target installation create possibility of survey from the A side A side : survey point outside the detector C side: survey point between A and C halves December 9, 2018 Antonio Pellegrino

Optimize the survey targets Currently used: gives good resolution in position and distance only one available (plus few spares) needs two accesses per dowel pin (distance and position) does not fit between two C-Frames Alternative 1: gives acceptable resolution in position and distance can make 2 x 9 needs one access per dowel pin does not fit between two C-Frames Alternative 2: gives good resolution in position and distance can make many (432??) needs no access fits between two C-Frames needs two survey stations in the magnet (triangulation) December 9, 2018 Antonio Pellegrino

Reduce the number of survey points Completion of OT alignment before pilot run: must have all points (2 x 2 x 9 per C-Frame) after adjustment can measure less points (1 x 2 x 5 per C-Frame) “Maintain” the OT alignment (long-term): can use a reduced set of points (1 x 2 x 5 per C-Frame) December 9, 2018 Antonio Pellegrino

“Side Survey” Target Alternative 3 (side view): gives good resolution in distance and acceptable in position can make 18 needs one access per dowel pin does not fit between two C-Frames needs survey platforms to be made create possibility of survey from the A side A side : survey point outside the detector C side: survey point between A and C halves December 9, 2018 Antonio Pellegrino