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Input Mode Cleaner

Input Mode Cleaner. Update LIGO-G070343-00-Z. IMC. Reminder: New end mirror ordered (14 cm vs.. 8 cm); needs new Payload -- Roma 1 ; and new installation tooling -- Nikhef ; In addition: losses in IMC close to 50 %, needs action at level of input bench: DiHedron.

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Input Mode Cleaner

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  1. Input Mode Cleaner Update LIGO-G070343-00-Z Thomas S. Bauer - Nikhef

  2. IMC Reminder: New end mirror ordered (14 cm vs.. 8 cm); needs new Payload -- Roma 1; and new installation tooling -- Nikhef ; In addition: losses in IMC close to 50 %, needs action at level of input bench: DiHedron. Since beg. 2007, Nikhef responsible for IMC. Thomas S. Bauer - Nikhef

  3. IMC End Mirror End mirror Payload: already started by Roma -1 Installation tooling: at present designed by Frans Mul (Nikhef). next few slides are by Frans. Thomas S. Bauer - Nikhef

  4. VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nl CONCEPT First step, mirror on support Thomas S. Bauer - Nikhef

  5. VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nl Lifting device Gear box Installation frame Vacuum clamping Mirror Recoil mass Mirror support Recoil support Vacuum pump 2 mbar vacuum 4.8 l/min DC 12 V 2 Amp Thomas S. Bauer - Nikhef

  6. VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nl Movements Rotation Translation Translation Tilt & keep Translation Translation Translation Side view Rear view Front view Thomas S. Bauer - Nikhef

  7. VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nl CENTRE OF GRAVITY Total weight 71 kg Thomas S. Bauer - Nikhef

  8. VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nl CENTRE OF GRAVITY VARTA Deep Cycle battery 12V/ 44Ah hxbxd: 225 x 176 x 409 38 kg € 192 Total weight 71 kg Thomas S. Bauer - Nikhef

  9. VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nl Thomas S. Bauer - Nikhef

  10. VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nl Thomas S. Bauer - Nikhef

  11. VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nl 114kg THE END Thomas S. Bauer - Nikhef

  12. Timescale Mirror RM design production Marionetta design production Frame design production Tests and optim. Installation M J J A S O N D J F M 20072008 Thomas S. Bauer - Nikhef

  13. Timescale ITF Shutdown Few days 1 -2 days 1 week ? more ? 1-2 days 1 week Few days 2 weeks min 5 … 6 weeks end April 08 Old Mirror dismount Marionetta dismount machining re-mounting SA pre-tuning New MC installation SA post-tuning Total Tower closed: Thomas S. Bauer - Nikhef

  14. End mirror Action : Finalize tooling design: few measures need to be fixed, no work; Approve and produce it. Decide about Marionetta: Options: - modifying the existing one, will take precious time when tower is open; - produce a new one (can be done at Nikhef) will save time (and surprises) Thomas S. Bauer - Nikhef

  15. DiHedron… Problems: • Present DiHedron "jumps"; • IMC transmission about ~ 55..60 % • due to too small aperture? • or rather to poor quality*) mirrors? *) - could be "dirty" Thomas S. Bauer - Nikhef

  16. Present DiHedron Injection Bench Thomas S. Bauer - Nikhef

  17. Present DiHedron Thomas S. Bauer - Nikhef

  18. Options DiHedron Clamp existing DiH on Bench, or suspend it: solves only jumping, not losses Clean mirrors: not easy - chance for success… ? Replace DiH by 2 suspended mirrors (GEO600) quite involved, crowded IB, commissioning? new DiH with larger apertures: solves only part of problems Other ??? Thomas S. Bauer - Nikhef

  19. Present DiHedron Channel for alignment Mirror Mirror Beam Thomas S. Bauer - Nikhef

  20. inverted DiHedron (?) Beam Mirror Mirror Thomas S. Bauer - Nikhef

  21. L H2 H1 FEA inverted DiHedron L = 55 D = 54 S =20 R1 =10 R2 =17.5 R3 =40 T =30 H1 =90 H2 =70 H3 = 5 Thomas S. Bauer - Nikhef

  22. Oscillation in X-Y plane Oscillation in X-Z plane 3D-Torsional mode 4250 Hz 7500 Hz 4600 Hz Thomas S. Bauer - Nikhef

  23. Thomas S. Bauer - Nikhef

  24. Advantages vs. Problems 2 "minitowers" for independent mirrors complicated: - very crowded area, - commissioning needs quite considerable time Inverted DiHedron: need to get good idea on whether it is possible; prelim. FEA indicates: lower frequency Seems to be a nice idea, but is it a viable option?? Thomas S. Bauer - Nikhef

  25. Summary End mirror: Design tooling, Gearbox, started need to finalize and approve it start production Marionetta: produce a new one? or modify existing one? DiHedron: available information collected, no decision yet. Independent mirror suspension looks quite complicated. New Dihedron with larger aperture ? inverted? Thomas S. Bauer - Nikhef

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