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Status Brussels GANTRY Ê We have observed a significant influence due to temperature 4 we had a lot of problems with our cooling system (ventilation) Ë.

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Presentation on theme: "Status Brussels GANTRY Ê We have observed a significant influence due to temperature 4 we had a lot of problems with our cooling system (ventilation) Ë."— Presentation transcript:

1 Status Brussels GANTRY Ê We have observed a significant influence due to temperature 4 we had a lot of problems with our cooling system (ventilation) Ë We have experienced problems with the frame thickness Ì Towards assembly of R6 modules 4 via dry assemblies we have estimated corrections  we reach good resolutions (  x,  y ~ 3-4  m and  ~ 2-3 mdeg) O.Bouhali, J.D’Hondt, J. Heyninck, C.Vandervelde, L.Van Lancker, J.Wickens CMS TK week – July 2004 J.D’Hondt

2 R6 module precision Ê Test of angular precision of the sensor positioning ï pick-up sensor, rotate by some angle, put-down and measure via 2 FM the angle Applied angle in degrees zoom of above figure CMS TEC specifications Outliers mostly due to a failure in the pattern recognition ï we add routines in the assembly procedure to indentify those and solve them RMS ~ 2.8 mdeg J.D’Hondt Shift in angle (applied – measured) 10 mdeg -10 mdeg

3 R6 module precision Ê Test of angular precision of the sensor positioning (apply 50x same angle) 0 o angle Angle (mdeg) Shift & RMS (mdeg) 00.5 & & & & & & 1.8 Very good precision !! Shifts are corrected for !! During dry assemblies we obtain : RMS(x,y)~ 2-4  m RMS(  ) ~ 2.0 mdeg … but average shifts which depends on the room temperature !?!? J.D’Hondt

4 Problems with thickness of R6 frames Ê Due to a variation in the carbon fiber leg thickness, the frames have a thickness distributed around 835  m with an RMS of about 20  m Ë Even within one frame the thickness can vary a lot Hence our assembly plates have to accommodate these fluctuations by having a relative deep groove for the frame with respect to the sensor level.  our R6 and R5 plates have a groove of only ~860  m hence between 0-50  m extra space (Santa Barbara between  m) 6 we have observed that the precision of the assembled module depends strongly on the thickness of the frame (extra shift of up to 60  m !!) 6 it is difficult to identify these frames prior to assembly, unless you perform a dry assembly for each frame before… extremely time consuming  The grooves in the plates have to be made more deep, by about ~60  m !!! J.D’Hondt

5 Summary Cooling problems : Cooling problems : Ê Temperature control system just repaired… R6 modules : R6 modules :  We reach good precision (RMS (x,y) ~ 3-4  m, RMS  ~ 2 mdeg) with no frame or thin frames with no frame or thin frames Ë The grooves in our assembly plates have to be increased by about 60  m to be able to use all frames about 60  m to be able to use all frames Ì Ready today for R6 production using thin frames Work skedule : ¶ No holiday period foreseen in our lab !! Ë Commitments : 4 plates per day (R3, R5N, R5S, R6) J.D’Hondt

6 Overview Brussels Gantry Commitments (ready - close to be ready - not ready) : R6 1 plate / day (+1 back-up)3 modules / day~1100 total R5N1 plate / day (+1 back-up)3 modules / day~800 total R5S1 plate / day (+1 back-up)3 modules / day~800 total R31 plate / day4 modules / day~700 total Work skedule : À 2 FTE within Gantry skedule (no holiday period in our lab) Á Skedule includes :  all tests of hybrids (ARC & optical)  assembly of modules (including DB operations)  all shipments issues Main residual problems : 6 temperature control in clean room and influence of frame thickness J.D’Hondt


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