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Output Mode Cleaner Concept Calum I. Torrie & Chris Echols

Output Mode Cleaner Concept Calum I. Torrie & Chris Echols. Notes for Chris: Can you look at position of blade in LIGO-D060014-07? No lower blades in prototype, can you update?. FEA: Optics Bench. ANSYS & ANSYS Workbench Dimensions 450mm x 150mm x 40mm Modal analysis with free / free B.C.

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Output Mode Cleaner Concept Calum I. Torrie & Chris Echols

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  1. Output Mode Cleaner ConceptCalum I. Torrie & Chris Echols • Notes for Chris: • Can you look at position of blade in LIGO-D060014-07? • No lower blades in prototype, can you update? Page 1 T060264-00

  2. FEA: Optics Bench • ANSYS & ANSYS Workbench • Dimensions 450mm x 150mm x 40mm • Modal analysis with free / free B.C. • Resonance and suspension point? • Simple model in ANSYS • Fused silica, f1 ~ 1100 Hz * • Assembly model in ANSYS Workbench • Fused silica, f1 ~ 1100 Hz * • Sam’s Assembly model • Aluminium + optics, f1 ~ TO DO • Fused silica, f1 ~ TO DO * Ties up with Sam’s calculation. Still to converge and look for best place to suspend from, Sam think you have you looked at this? Page 2 T060264-00

  3. OMC Top Blades = IMC Top Blades • The IMC Suspension • library of clamps, LIGO-D020677 • Blade LIGO-D020205 • Document LIGO-T030125 • Clamps • +/- 3.5 degrees (in 0.5 degree increments) • Up to +/- 500g per blade • Recommend optics bench defined as 6kg +/- 600g Page 3 T060264-00

  4. Lower Blades • 0 to 2.5 degrees • Tip height moves ~ 5mm • Implies 150g per blade • or 600g per mass • (10%) of total mass • 45mm defl for 1500g Page 4 T060264-00

  5. FEA: OMC Structure • ETM Controls Prototype has a welded structure modelled with this technique and verified with experiment • ETM • f1 (model) ~ 220 Hz • cf. f1 (expt) ~ 200 Hz • OMC • f1 (model) = 175 Hz * • * Not as good as I first reported as now investigating in more detail wrt convergence and was previously clamping it at the top! (Should be able to stiffen by adding crossbars!) Page 5 T060264-00

  6. OMC Structure • 3” x 3” x 0.5” thick triangular stiffeners for the corners • Pre-machined before welding in similar fashion to those used in IMC, ref Mike Gerfen Page 6 T060264-00

  7. Optics bench - Alt • Alternative method rather than clamping at the bench is to add ears to the side of the bench and have the wires pass below the bench, could arrange for grooves or slots to be machined in the glass Page 7 T060264-00

  8. OSMES • ACTION: - Calum to talk to Ken Strian and Stuart Ashton • Spoken to KAS and now need to speak to SA! • DONE! BIRMINGHAM STYLE OSEMS WILL BE SUPPLIED! • JOINED PART SENT TO CHRIS FOR INCLUSION IN ASSEMBLY!! Page 8 T060264-00

  9. OMC Suspension Update Calum I. Torrie et al 7th Dec 2006 rev 02

  10. OMC Structure – layout & detail • Box section legs 0.25" thick! • Key sizes / planes • 101.6mm (4“) • 45mm • 250mm • 250mm • Non suspended mass • OSEMs, • Tablecloth, • Blades & • Eddy Current Dampers Page 10 T060264-00 With Janeen + Chris

  11. OMC Structure - FEA • ANSYS Workbench • Aluminium • Mesh • Advanced with element size 1.2e-2 • 40,000 elements - converged! • Includes non-suspended mass • 6 fixed pads on base • Now on the vault! • 1st mode (transverse) 180 Hz Page 11 T060264-00 • 2nd mode (longitudinal)190 Hz

  12. Test bond with beamsplitter & Zerodur bench • Picture from Julia Kennedy • 4th year Hons. project with Jim & Sheila Page 12 T060264-00

  13. OMC – Eddy Current Damper? • Just an option not current baseline • see info later from NAR • Up to 50% more damping than 2 individual magnets! • Magnet 2x 10mm x 10mm • spacer 10mm x 3mm Page 13 T060264-00 With Mark Barton

  14. OMC Structure - FEA • have now modelled examples • with lumped mass rather than table cloth • Without tablecloth • 1st freq ~ 172 Hz • ** CHRIS E TO WORK ON VERSION IN VAULT TO ENSURE EQUIV PARAM etc … Page 14 T060264-00

  15. ECDs • Sent info to Chris via e-mail! Page 15 T060264-00

  16. Page 16 T060264-00

  17. March 2007 • Metal bench assembly • Glass bench • Clamp wire clamp and resp. assembly procedure • Welding issues • FEA of structure Page 17 T060264-00

  18. Weld samples • Sample #1 (Gusset & butt welds) • Gussets • Gussets machined with chamfer prior to welding • Welded from one side, then machined on other side & welded from second side • Visual inspection looked good • Further inspection ongoing! • Butt • leg machined with chamfer prior to welding • Base not machined! • Leg welded to base from one side (outside) • Visual inspection corners / edges not full penetration • Further inspection ongoing! • Sample #2 (Butt weld with ledge in base) • Butt weld from one side • leg machined with chamfer prior to welding • Ledge cut in base • Leg cut out created only to ease inspection! • Visual inspection corners / edges not full penetration • Further inspection ongoing! • Sample #3 (Butt weld from both sides) • This time cut out our allows for butt weld to be performed from both sides • Chamfer added to leg, unsure of prep on base? • No photos sorry! Page 18 T060264-00

  19. Page 19 T060264-00

  20. FEA of OMC Structure • Upper structure from Alum with machined base with legs and gussets welded • No gussets at bottom due to access for laser beam • Modelled • 60,000 elements • 6 location fixed on base • Point mass rep tablecloth, blades etc … • f1 = 176 Hz • f2 = 182 Hz Page 20 T060264-00

  21. FEA of OMC Structure • Modified to allow access for full penetration welds • Does not include plates that will be added with bolts and pins • Modelled • As per previous example • f1 = 117 Hz * • f2 = 123 Hz * • * Does not include plates! Page 21 T060264-00

  22. FEA of OMC Structure • Rather than model plates bolted and pinned looked at small sections as if they were welded f1 = 150 Hz f1 = 130 Hz Page 22 T060264-00

  23. FEA of OMC Structure • Alternative arrangement made from stainless steel • Using modified design but essentially based on upper structure for ETM • f1 = 140 Hz, f2 = 160 Hz • Mass = 35 kg • STILL MORE WORK TO DO! Page 23 T060264-00

  24. Optical bench • with counter bore holes and clamp wire clamp assemblies • Please reference sequence Page 24 T060264-00

  25. Wire clamp assembly for glass bench Page 25 T060264-00

  26. Modifying the wire jig Page 26 T060264-00

  27. Wire jig assemnly Page 27 T060264-00

  28. Making the clamp-wire-clamp Page 28 T060264-00

  29. Clamp wire clamp Page 29 T060264-00

  30. Bolt clamp to blade (only 1 shown, should add all 4)

  31. Raise bench on lab jack Page 31 T060264-00

  32. Add sleeve Page 32 T060264-00

  33. Lock sleeve into position Page 33 T060264-00

  34. Lower bench onto stops Page 34 T060264-00

  35. Close up of bench wire clamp Page 35 T060264-00

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