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LiCAS train simulations (current status of work done at Oxford) Grzegorz Grzelak
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Simulation Software Simulgeo: simulation and reconstruction software for optogeometrical systems. (L. Brunel, CMS note 1998/079) Many features: –Laser beams –CCD cameras –Mirrors –Distancemeters –... Description of mechanical support by grouping various objects into local frames
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Simulation of single train 2 laser beams for SM 2 beam splitters per car 2 CCD cameras per car 4 internal FSI lines 2*6 external FSI lines -------------------------------- 1 m res. (all positions) 1 rad res. (all orientations) 1 m res. (all FSI and CCD) -------------------------------- Problem: Weak sensitivity to rotation Around z-axis (and y-coor. of the wall marker)
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Single train (cont.) Even for very unrealistic assumption (0.1 m for CCD, 0.01 rad for relative alignment of two laser beams in SM) Rotation around z-axis is still the weakest measurement !!! Need to include the clinometre…
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Single train + clinometre One axis tiltmetre (1 mrad res.) Now the position Along z-axis is The weakest parameter (this is OK)
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Single train – no syst. errors In order to perform the Full simulation of longer Tunnel section the model must be simplified (CPU+MEMORY limit !) Here: the only source of errors comes from FSI and CCD (which are set to 1 m) All output errors are scaled down by factor 2
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More trains (15) 15 overlapping trains 2 wall markers in front of each car “boundary effect” at the ends of tunnel section less overlap Surprise Very steep growth of Transverse errors (x and y coord.) (can be explained even using much simpler model when drawing long line using short ruler)
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Full simulation of 600 m tunnel 200 m over 600 m Seems to be feasible but very tough (REMEMBER: there are not systematic errors in this simulation) On the other hand: the relative misalignment of adjacent accelerator components are not so big the points are strongly correlated !!!
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