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LEB meeting March 21 st , 2012

LEB meeting March 21 st , 2012. LHCb Survey Tolerances and Stability estimation. Jean-Christophe Gayde March 21 st , 2012. GGPSO xR8— Ref points on floor. Low Beta Q1 Q2 Q3. Right Side. Low Beta Q3 Q2 Q1. GGPSO xL8— Ref points on floor. IP VELO RB84. Left Side.

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LEB meeting March 21 st , 2012

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  1. LEB meeting March 21st, 2012 LHCb Survey Tolerances and Stability estimation Jean-Christophe Gayde March 21st, 2012 LEB Meeting - EDMS n° XXXXXXX

  2. GGPSO xR8— Ref points on floor Low Beta Q1 Q2 Q3 Right Side Low Beta Q3 Q2 Q1 GGPSO xL8— Ref points on floor IP VELO RB84 Left Side GITL4L805 deep reference ~66m from IP LHCb – Global View LEB Meeting - EDMS n° XXXXXXX

  3. Geodetic Network Measurement • Link Cavern Geodetic Network • Radial position: based on the best fit line of the LowB triplets • Vertical position: based on the Deep Reference on Left Side • Last Network measurements: • Aug-September 2005: • Complete measurement of the cavern network • February 2006: • Direct link between left and right side of the tunnel through the RICH2 bore tube.  • September - December 2006: • Last possible direct link between left and right sides • October 2006: VELO position measurement • May 2008: • Opening of the RB84 shielding • Control of the link (mainly vertical) between the cavern network around the VELO, • the left side LowBetaquadrupoles and the Deep Reference • In this period: Change of the Network coordinates (VELO area) < 0.5mm (average) • No Left/Right direct link possible since 2006 • LowB quad smoothing done in the mean time LEB Meeting - EDMS n° XXXXXXX

  4. Radial position of the VELO on Sept/Dec 2006 LEB Meeting - EDMS n° XXXXXXX

  5. Vertical position of VELO on Sept/Dec 2006 LEB Meeting - EDMS n° XXXXXXX

  6. An estimation of stability Geodetic Network / Experiment RICH1 Vessel Physicist Coordinate System LEB Meeting - EDMS n° XXXXXXX

  7. Muon Side UX85/2 Support Ring Centre of SU Target B2A_T A Side 20.0mm UX85/3 IP Side Ring B2AA_1 B2CC_1 Y Phys C Side Z Phys X Phys B3AA B2A_B B2CENT IP Side An estimation of stability Geodetic Network / Experiment Beam Pipe UX85-2 and UX85-3 B2CENT: Centre of the UX85/2 Ring B3CENT: Centre of the UX85/3 Ring Physicist Coordinate System LEB Meeting - EDMS n° XXXXXXX

  8. Conclusion • The Cavern Geodetic Network measured several time from 2005 to 2008 seems stable • But adjustment for smoothing can be applied to LowB on left and right sides • Radial link LowB / Network measurement: • No Left/Right direct optical link possible since 2006 • When RB84 Shielding is opened: • Survey Left side / Network in VELO area is possible • Precise levelling measurement from Deep Reference to VELO area • Radial control -> Not precise (lever arm) • Note that a HLS System allows level monitoring between Left and Right triplets • One of the sensors is in the cavern but on Muon side: • Far away from the VELO region • Difficult to measure the link HLS sensor/Network near the VELO • Along vertical axis: Survey tolerance 1,5mm at 2 sigmasapplicable • For radial position it was the case on 2006 – Now ? • Study of position and stability using Primary Vertex reconstruction? -> LHCb LEB Meeting - EDMS n° XXXXXXX

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