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Status Update on Mechanical Prototype in Rome

Status Update on Mechanical Prototype in Rome. November 6, 2013. Introduction. We have built the mechanical M2 quadruplet prototype : Assembly of the 5 panels with the “ vacuum bag ” technique ( with some variants ); Assembly of the quadruplet . Outline of the talk:

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Status Update on Mechanical Prototype in Rome

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  1. Status Update on MechanicalPrototype in Rome November 6, 2013

  2. Introduction • Wehavebuilt the mechanicalM2 quadrupletprototype: • Assembly of the 5 panelswith the “vacuum bag” technique (with some variants); • Assemblyof the quadruplet. • Outline of the talk: • Description of the methodused for the assembly of the last 2 panels (two-stepsgluingtechnique); • M2 panels: structure and components • Results of planaritymeasurementsof the last 2panels; • Quadrupletassembly; • Conclusions.

  3. Method of construction - I • Vacuumbagtechnique. • Vacuum bag operatedwith • anunderpressureof 50 ÷ 100 mbar.

  4. Method of construction - II • First 3 panels(seejuly workshop presentation): • Single-stepvacuumbaggluing: PCB-1 on thegranitetable, PCB-2 on the honeycomb “pushed” by the bag.Glueis put on bothPCBs;  asymmetric planarities obtained (*) ≈ 10 ÷ 20 mm (bottom side) ≈ 30 ÷ 50 mm (top side) • Last 2 panels: • Two-stepsvacuum bag gluing: PCB-1 gluedasabove. After a time Dt the panel isturned and glued to PCB-2 standing on thegranitetable. • Dt = 24 or 5 hrs (glue curing time ≈ 15 hrs @ 20o) (*) Module 2 built with segmentedhoneycombhaslargerRMSs

  5. Test of two-step gluingmethod Aim of the method: reach a goodplanarity on bothsides of the panel. Wehavedoneseveraltests to validate the two-step method, both with Dt=5 and Dt=24 hrs. 100x60 cm2 panel  planaritybelow 20 mm on bothsides  thickness value -26mm wrt nominal Dt = 24 hrs SIDE 1 Dt = 24 hrs SIDE 2 frame points frameswerenotrectified in this test

  6. M2 panels – general structure 1628.5 mm 916 mm Aluminiumrectifiedframes: 40 mm the outer frame 20 mm the inner bar 1103.2 mm

  7. M2 panels - components • PCBmeasurementsdone by PV group on suckingplane. • Honeycombmeasurementsdoneusing the LNF laser tracker with a gaugeblockaboveit. • Frame thickness and planaritycheckedwithMitutoyo. • Glue Araldite 2011: the glue is rolled to give a uniform layer of ≈ 60 mmthickness. • Nominalthickness=2x0.40+2x0.06+10.040=10.960 (11.120panel2) mm

  8. Methods of planaritymeasurement - I Laser tracker @ LNF ≈2500 points with few mm accuracy

  9. Methods of planaritymeasurement - II CMM Machine @ INFN Pisa (points are in a 4 cm spacinglattice) ≈700 points with 2 mm nominal precision

  10. Analysisofplanaritymeasurements •  A list of 3D points wrt a plane defined by the machine itself(obtained by measuring the granite table). • Ouranalysis: • Rawdistributionof heights of the points  sRAW • Fit of the “best plane”  <thickness>, aX, aY • Distribution of heightswrtfittedplane  sFIT • Allthese infos are given in the following. • LNF laser trackerisourbaseline measurement, comparison with CMM will be shown.

  11. Comparisonbetweenplanaritymeasurements: LNF (laser tracker) vs. Pisa (CMM machine) –panel5 side 1

  12. Comparisonbetweenplanaritymeasurements: LNF (laser tracker) vs. Pisa (CMM machine) –panel5 side 2

  13. Angles of fittedplanes aX,Y(Pisa) RMS(LNF) = 25 mrad RMS(Pisa) = 16 mrad Correlation LNF-Pisa: Some correlationispresent. aX,Y(LNF)

  14. Results: panel4 (Dt = 24 hrs) side 1 sRAW (RMS) = 24.4 (28.6) mm sFIT (RMS) = 26.2 (27.0) mm removing the frames: sFIT= 21.7 mm

  15. Results: panel4 (Dt = 24 hrs) side 2 sRAW (RMS) = 29.0 (30.7) mm sFIT (RMS) = 28.1 (27.9) mm removing the frames: sFIT = 22.9 mm

  16. Results: panel5 (Dt = 5 hrs) side 1 sRAW (RMS) = 36.5 (39.1) mm sFIT (RMS) = 35.7 (35.7) mm “depression” on external frame removing the frames: sFIT = 22.8 mm

  17. Results: panel5 (Dt = 5 hrs) side 2 sRAW (RMS) = 39.2 (41.2) mm sFIT (RMS) = 35.2 (38.8) mm “depression” on external frame removing the frames: sFIT = 21.5 mm

  18. Summary - I Sigma obtainedafterplanefittingsFIT The measurementisperformedremovingallpointswithin 10 cm from the frame Thicknessmeasured with side 1 in the table. In () difference in mm wrtnominal.

  19. Summary - II • Planarities: • Two-stepsmethodwith Dt = 24 hrsturns out to be the best option with overallplanarities RMS wellbelow 30 mm on bothfaces. • Improvementsexpected by a better “definition” of the frame  20 mm planarities can be reached. • Panel thicknesswrtnominal(assuming2x60 mm gluethickness): • In average -15 mm with an RMS of 17 mm. • Improvementsexpectedby a bettercontrolof the glueamount. • Methods of measurement • CMM machine and Laser-trackergiveresults in good agreement.

  20. Quadrupletassembly - I Assembly scheme: Panels are glued to drift gap frames (5 mm thick Al notrectified, 20 mm wide) No vacuum bag used, gluingbygravity allpanels in a single step.

  21. Quadrupletassembly - II

  22. Quadrupletassembly - III Precision pins Connecting the two “strip panels”.

  23. Status ofquadruplet • Mechanicalpropertiesstilltobemeasured. Probably a “sag” effect on the top side, tobequantified. • Weplantomakeholesalong the frame toallowmounting on the spacer.

  24. Conclusions • M2 dummyquadruplet ready to bemounted(onlyholes are stillmissing). • Vacuum bag technique(with two-stepsgluing option) allows to get: • Overallplanaritiesbelow 30 mm on bothsides; • Averagethicknessreproducibilitybetterthan 20 mm; • Spaceforimprovementsfrombetter frame structure and glueamountcontrol. • Plantobuild a full-size SM1 driftpanelusing the two-step methodwithDt = 24 hrs

  25. Backup

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