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ALL-METAL CONTROLS PROTOTYPE QUADRUPLE PENDULUM SUSPENSION

This presentation discusses the design, control aspects, and installation procedures of the all-metal controls prototype pendulum suspension for Advanced LIGO. It includes information on the quadruple pendulum suspension, noise reduction measures, and ongoing testing and development.

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ALL-METAL CONTROLS PROTOTYPE QUADRUPLE PENDULUM SUSPENSION

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  1. LIGO G060055-01 ALL-METAL CONTROLS PROTOTYPE QUADRUPLE PENDULUM SUSPENSION Calum I. Torrie (given by Caroline A. Cantley) on behalf of the entire team involved in the work associated with the all-metal controls prototype pendulum suspension for Advanced LIGO LSC MEETING HANFORD MARCH 2006 Advanced LIGO 18th March 2006

  2. Suspension Design for Advanced LIGO • Four stage pendulum with three stages of cantilever blade springs for enhanced vertical isolation • Minimise noise from control: • damping at top mass • use of reaction pendulum • Target suspension noise level for main optics (test masses): 10-19 m/ Hz at 10 Hz • Reduce thermal noise: • 40 kg silica mirror suspended on silica ribbons • Involves two prototypes • Controls prototype – all metal (US with UK) • Noise prototype – with silica final stage (UK with US) silica penultimate and test masses silica ribbons Advanced LIGO 18th March 2006

  3. All-Metal Controls Prototype Quadruple Pendulum Suspension • team from Caltech, Glasgow, MIT, RAL & Stanford • aim is to check • mechanical design • control aspects • installation & alignment procedures • construction and initial testing performed at Caltech • suspension delivered to LASTI in February 2006 • construction and assembly complete • tests on the suspension with support structure underway • first installation fixtures to be delivered in April 2006 • suspension will be moved into BSC chamber (on solid stack) mid-April 2006 C. Torrie’s talk in SWG breakout session Advanced LIGO 18th March 2006

  4. Quad Controls Prototype @ LASTI • Quad assembled and suspended on solid stack, mounted on test stand, in February 2006 • Relative alignment of the two chains to 0.3 mrad in pitch & yaw • Prior to installation the suspension structure will be aligned on the solid stack using the auto-collimator Advanced LIGO 18th March 2006

  5. Quad Controls Prototype @ LASTI Advanced LIGO 18th March 2006

  6. Installation Fixtures (alignment tooling) • For Quad controls prototype • Lift table (mechanised) • Custom X, Y, Pitch, Rotation table • 300 lbs • Tested under 2000lb load • Mobile vertical table (lighter alternative) • 300 lbs • Tested under 2000lb load • Articulated arm concept + Advanced LIGO 18th March 2006

  7. 2nd QUAD structure • Equivalent structure with “dummy” non-suspended mass • Installed on technology demonstrator at Stanford • Will be shipped to UK for further noise prototype development • optimisation • tuning of monolithic stage assembly procedures • Refer to B. Lantz talk at the SEI/SWG breakout session Advanced LIGO 18th March 2006

  8. What’s Next • Controls prototype quad suspension tests @ LASTI • damping, transfer function, mode frequencies • alignment & transfer to beam splitter chamber (BSC) on solid stack • installed onto seismic table – combined testing • Continued development of installation tooling • Other work • Final design of input mode cleaner suspension for noise prototype production • Conceptual design of double pendulum pick off mirror suspension • Output mode cleaner suspension design Advanced LIGO 18th March 2006

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