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Lab tests on Mirror Support

Lab tests on Mirror Support. M.Lenti. Glass robustness. Test if mirror glass is robust enough to be supported in a single point (single dowel approach )

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Lab tests on Mirror Support

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  1. Labtests on MirrorSupport M.Lenti

  2. Glass robustness • Test ifmirrorglassisrobustenoughtobesupportedin a single point (single dowelapproach) • Used first anavailablepre-seriesmirror (w/o centralhole), supportingitthroughoneof the lateralhole (turned 90 deg) M.Lenti

  3. Mirrorsupportedin onepoint Single dowel Turned 90 deg • Left in placefor a coupleofdays: • no mechanicalcrack • no opticaldeformation M.Lenti

  4. Next text: add a weight 20 Kg W disk on top of the glass • Left in placefor a coupleofdays: • no mechanicalcrack • no opticaldeformation M.Lenti

  5. Checkagain…. No crack close or inside the hole Unplug the mirror…. Anticorodalaluminumdowel Turn the mirrorby 180 deg, use the other side hole, play again No damage M.Lenti

  6. Dummymirrors • Marconprepared 4 “dummy” mirrors • Samedimensions, sameglass, sameholesastruefinalmirrors (centralholepresent) • Thesedummy are alsotransparent (truemirrorsopaque on the back) • Usedummymirrorsforglassrobustness test and foralignmenttests M.Lenti

  7. Dummymirror No crack wellvisible M.Lenti

  8. Myproposal • Endorsenow the “single dowelapproach” forsupportingthe 18 hexagonalmirrors M.Lenti

  9. Semi-hex ?? Onlytwoholes (barycenter in between the twoholes) A third (central) holewasnotdrilled (toomanyholestooclose…) M.Lenti

  10. Semi-hex Pullingribbonfortop-bottomalignment • Proposaltobediscussed: • twodowels • top-down alignmentsimilartohexagonalmirrorbutwithoutpiezo • left-rightwith a screw in the dowelslodging frame • Semi-hextobealigned once and thenleftfixed (referenceforhexmirrors) screw M.Lenti

  11. Othertests encoder piezo • Improvingpiezoalignementwithencoders (see talk by Roberto C.) ribbon Usesolid state switchsoftware-driven tocommutefromonepiezotoanother M.Lenti

  12. Piezowith encoder in target mode Spot position on the photodiode 15.3.2011 10 μm stepof the piezo Spot position: 0.0015u → 10 μm →(10μm/700mm)= 15 μrad Piezo 1 Piezo 2 Test withaluminumsegment: dist. Mirror-phtdiode 700mm Piezo 1 Piezo 2 M.Lenti

  13. Conclusions • Glass robustnesstestspassed • Proposaltoendorse “single dowel” approachfor 18 hexagonalmirrors • Solutionfortwosemi-hextobeworked-out • Piezo+encoders: see Roberto’s talk • Mirrorsupportwall: Philippe and Pietpresentation on Feb 9, 2011 M.Lenti

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