1. 21/5/2007Thomas S. Bauer - Nikhef1 Input Mode Cleaner Update LIGO-G070343-00-Z

2. 21/5/2007Thomas S. Bauer - Nikhef2 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.

3. 21/5/2007Thomas S. Bauer - Nikhef3 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.

4. 21/5/2007Thomas S. Bauer - Nikhef4 VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nlfmul@nikhef.nl First step, mirror on support C O N C E P T

5. 21/5/2007Thomas S. Bauer - Nikhef5 Vacuum clamping Mirror support Mirror Recoil mass Recoil support VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nlfmul@nikhef.nl Gear box Lifting device Installation frame Vacuum pump 2 mbar vacuum 4.8 l/min DC 12 V 2 Amp

6. 21/5/2007Thomas S. Bauer - Nikhef6 VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nlfmul@nikhef.nl Front view Rear view Translation Side view Translation Rotation Tilt & keep Movements

7. 21/5/2007Thomas S. Bauer - Nikhef7 CENTRE OF GRAVITY Total weight 71 kg VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nlfmul@nikhef.nl

8. 21/5/2007Thomas S. Bauer - Nikhef8 CENTRE OF GRAVITY Total weight 71 kg VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nlfmul@nikhef.nl VARTA Deep Cycle battery 12V/ 44Ah hxbxd: 225 x 176 x 409 38 kg € 192

9. 21/5/2007Thomas S. Bauer - Nikhef9 VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nlfmul@nikhef.nl

10. 21/5/2007Thomas S. Bauer - Nikhef10 VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nlfmul@nikhef.nl

11. 21/5/2007Thomas S. Bauer - Nikhef11 VIRGO MODE CLEANER END-MIRROR INSTALLATION fmul@nikhef.nlfmul@nikhef.nl THE END 114kg

12. 21/5/2007Thomas S. Bauer - Nikhef12 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 2007 2008

13. 21/5/2007Thomas S. Bauer - Nikhef13 Timescale ITF Shutdown Old Mirror dismount Marionetta dismount machining re-mounting SA pre-tuning New MC installation SA post-tuning Total Tower closed: Few days 1 -2 days 1 week ? more ? 1-2 days 1 week Few days 2 weeks min 5 … 6 weeks end April 08

14. 21/5/2007Thomas S. Bauer - Nikhef14 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)

15. 21/5/2007Thomas S. Bauer - Nikhef15 DiHedron… Problems: a)Present DiHedron "jumps"; b)IMC transmission about ~ 55..60 % -due to too small aperture? -or rather to poor quality *) mirrors? *) - could be "dirty"

16. 21/5/2007Thomas S. Bauer - Nikhef16 Present DiHedron Injection Bench

17. 21/5/2007Thomas S. Bauer - Nikhef17 Present DiHedron

18. 21/5/2007Thomas S. Bauer - Nikhef18 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 ???

19. 21/5/2007Thomas S. Bauer - Nikhef19 Present DiHedron Mirror Beam Channel for alignment

20. 21/5/2007Thomas S. Bauer - Nikhef20 inverted DiHedron (?) Mirror Beam

21. 21/5/2007Thomas S. Bauer - Nikhef21 FEA inverted DiHedron L = 55 D = 54 S =20 R1 =10 R2 =17.5 R3 =40 T =30 H1 =90 H2 =70 H3 = 5 L H1H1 H2H2

22. 21/5/2007Thomas S. Bauer - Nikhef22 Oscillation in X-Y plane Oscillation in X-Z plane 3D-Torsional mode 4250 Hz 7500 Hz4600 Hz

23. 21/5/2007Thomas S. Bauer - Nikhef23

24. 21/5/2007Thomas S. Bauer - Nikhef24 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??

25. 21/5/2007Thomas S. Bauer - Nikhef25 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?