Status on MONALISA presented by D. Urner 6 th stabilization day 9. June 09

Progress on mechanical setup Double bellow system:

Vacuum ~1.4 bar pressure SMC ITV1050 Pressure Regulator to compressed Air supply (~2.0 bar) Vent SMC PSE510 Pressure Sensor SMC PSE511 Pressure Sensor SMC ECC-PNAL2 Controller Idea: Generated Force is proportional to sum of pressure in inner and outer bellow system. –Find Point where force is zero Use commercial control system. Active Double Bellow

Progress on mechanical setup Double bellow system: –development geared towards minimal force system –development with Platine Prcision Ltd. started Sep 08 –full assembly of double bellow to double flanges this week –shipped to Oxford by end of week

Mechanical Vacuum system: 1st mode frequency: 266Hz. FEA shows very high resonance frequencies 2cm aluminium plate bolted to M30 taped holes in Shintake table Entire structure made from aluminium. Bellows: –actual bellows: stainless steel 316L –flanges: stainless steel: 304L 1 st mode frequency:162 Hz.

How to insert optics Insert optics platform –rests on very thin aluminium floor –essential a square piece of carbon-fibre loaded peak (plastic) holding retro- reflectors –easy to change to different (optics) geometries

Calibration Study Does system self-calibrate? –This means: calibration by making measurements at many locations. e.g: Photogrammetry does this –Can partially self-calibrate –Some DOF poorly determined What is the effect of calibration errors? –Effect is to introduce a scale error into displacement measurements –Simulated a “minimal” calibration scenario: “Calibration” = Where are these components located on their mounting plate? Shintake Monitor mounting plate QD0 mounting plate 1mm uncertainty in component locations 0.3% scale error for vertical motion

Calibration Study What is the effect of calibration errors? –Effect is to introduce a scale error into displacement measurements –Simulated a “minimal” calibration scenario: –e.g vibrations with amplitude 1 μ m would be limited in reconstructed accuracy to 3nm from calibration –a long-term shift of 100 μ m would be limited in reconstructed accuracy to 300nm “Calibration” = Where are these components located on their mounting plate? Shintake Monitor mounting plate QD0 mounting plate 1mm uncertainty in component locations 0.3% scale error for vertical motion

MONALISA at CLIC Start with 3 vertical lines –launch heads will be produced for KEK and CLIC by end of year –Need vertical tubes, ideally of 200 mm diameter Later add horizontal measurement –Need 200 mm horzontal tube –As much space at intersection as we can get.