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Report on mirror support tests

Report on mirror support tests. M.Lenti. Latest news from Marcon. Mirrors o ptical surfaces finished Since last week start cutting ( from circular to hexagonal shape ) with water jet tool After cutting : re-checking of optical surfaces

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Report on mirror support tests

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  1. Report on mirrorsupporttests M.Lenti

  2. Latest news fromMarcon • Mirrorsopticalsurfacesfinished • Since last week start cutting (fromcirculartohexagonalshape) with water jet tool • Aftercutting: re-checkingofopticalsurfaces • Shippingofall the mirrors at CERN foreseenby the end of the year • At CERN: aluminization and coating

  3. Outlook • Testswith “single dowel” prototype • Testswith “leafsprings” prototype (doubledowels) • Useanaluminummock-up in placeof a truemirror (samedimensions and weight) • Smallmirrorfixed on the aluminumhexagonfor laser beamreflection • Position sensitive photodiodeused (x,y)

  4. Single dowel • Full prototyperealized • “single dowel”: mirrorhung at the center • Mirrormovementaround u and v axis (insteadof x and y) • pulled at ±45 degrees (axisdecoupling) • Mirrorweight: counterbalanceforbothmovements • Piezo-motor (final) used • 0.25 mm thickaluminiumribbon (directtraction, no 90 degdeviation), 13 mm wide piezo piezo dowel dowel piezo dowel

  5. Single Dowel Controller mirror Piezo Motor Laser 2 1 PhotoDiode 0.25 mm thickribbon Piezo Motor

  6. PiezoMotors controller

  7. A, B ribbon joint on the mirror O doweltouchingpoint G mirrorbarycenter P, Q piezo-motor kinematics A B A l l O O P Q G P G y y z x z x

  8. Single dowel: try a closedloop Starting point End point Spot position on the PhotoDiode P1: piezo n.1 P2: piezo n.2 F: forward R: backward Laser-mirrordistance: 60 cm Mirror-photodiodedist: 90 cm P2R P1F 100 μm Fromonepointto the next: 100 microstep movementsof the Piezo (31.25 μm) 100 μm on the phtdiode → 70 μrad on the mirror P1R P2F y 100 μm x

  9. Single Dowel: forward and backward Spot position on the PhotoDiode Piezo n.1 y 100 μm x time

  10. Single Dowel: forward and backward Spot position on the PhotoDiode Piezo n.2 y Different scale w.r.t.previous slide 100 μm x time

  11. Single dowel: stability • Dayone, time: 15:20 PM. x=+0.0335, y=+0.0329 (photodiode) • Daytwo, time: 9:00 AM. x=+0.0374, y=+0.0327 (photodiode)

  12. Leaf Springs piezo • Full prototyperealized • “leafsprings”: mirrorhungthroughtwoholes • Mirrormovementaroundx and y axis • pulled at 0 and 90 degrees • Mirrorweight: counterbalanceforverticalmovement • Leafsprings: counterbalanceforhorizontalmovement • Piezo-motor (final) used • 0.25 mm thickaluminiumribbon (directtraction, no 90 degdeviation); l=250mm piezo dowel dowel dowels Leafsprings piezo dowel

  13. dowels LeafSprings prototype 0.5 mm aluminiumfoils

  14. LeafSpringprototype mirror ribbon Laser PhotoDiode Leaf Springs 0.25 mm thickribbon Piezo Motor

  15. LeafSpring: try a closedloop End point Spot position on the PhotoDiode PV: piezo “vertical” PH: piezo “horizontal” F: forward R: backward PHR Starting point PVR Laser-mirrordist. 40 cm Mirror-phtdiodedist: 70 cm PVF 100 μm Fromonepointto the next: 100 microstep movementsof the Piezo (31.25 μm) PHF 100 μm on phtdiode → 90 μrad on mirror 100 μm y x

  16. LeafSpring: forward and backward Spot position on the PhotoDiode PiezoHorizontal y 100 μm x time

  17. LeafSpring: forward and backward Spot position on the PhotoDiode Piezo Vertical y 100 μm x time

  18. LeafSpring: stability • Dayone, time: 16:20 PM. x=+0.0000, y=+0.0004 (photodiode) • Daytwo, time: 12:40 AM. x=-0.0031, y=+0.0040 (photodiode)

  19. Conclusions • Bothapproaches (single dowel and leafspring) prototyped • New piezomotorsused (neverstucked, “small” differencesin fw and bwmovements) • Needforencoders? • In preparation: ribbonwith 90 degreedeviation (care on cutting…) • In preparation: test withglassresistance

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