1 / 25

Update on LIGO IMC End Mirror Installation and Improvements Needed

This document outlines recent updates regarding the LIGO IMC end mirror, ordered in a new 14 cm size, replacing the previous 8 cm. It highlights the necessity for new payloads and installation tooling developed by Nikhef. Significant losses in IMC performance, nearing 50%, necessitate immediate action on the input bench. Key challenges include design modifications, potential mirror quality issues, and the complex installation of the DiHedron system. Future actions include finalizing tooling design and making strategic decisions on existing vs. new components.

edna
Télécharger la présentation

Update on LIGO IMC End Mirror Installation and Improvements Needed

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related