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40m Suspension Electronics

This project aims to develop advanced digital suspension electronics, similar to those used in LIGO, for a 40m system. The requirements include precise coil drivers, effective noise filtering, and modeling to validate the performance. Future work includes completing controls wiring, ordering necessary components, installing modules, and commissioning the suspension electronics.

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40m Suspension Electronics

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  1. 40m Suspension Electronics Benjamin Abbott California Institute of Technology 10/18/01 G010385-00-R

  2. Requirements • Digital Suspension should be as Advanced LIGO-like as possible. • Coil Drivers should be sufficient to move the 1.3Kg optics with a dynamic range on order 30m p-p in length, and 1.5mrad p-p in angle. • Filtering should meet 10-20 m/Hz noise requirement. Benjamin Abbott G010385-00-R

  3. Modeling • Modeling done in Simulink • Intended to prove that small optic controllers are sufficient for 40m core optics. • Noise suppression was evaluated. Benjamin Abbott G010385-00-R

  4. Simulink Yaw Model 1 / I (where I=M(D2/16+L2/12)) Benjamin Abbott G010385-00-R

  5. Yaw Controller Model Increased Gain Removed Coil Driver Compensation Benjamin Abbott G010385-00-R

  6. Open Loop Yaw Response Benjamin Abbott G010385-00-R

  7. Closed Loop Yaw Response Pseudo- critically damped response Benjamin Abbott G010385-00-R

  8. Simulink Position & Pitch Model (1 / I) Benjamin Abbott G010385-00-R

  9. Position controller Gain x5 Benjamin Abbott G010385-00-R

  10. Pitch Controller Gain x5 Benjamin Abbott G010385-00-R

  11. Open Loop Position Response Benjamin Abbott G010385-00-R

  12. Closed Loop Position Response Pseudo-critically damped position response Benjamin Abbott G010385-00-R

  13. Position Noise Spectrum 10-20 m/Hz @ 45Hz Benjamin Abbott G010385-00-R

  14. Open Loop Pitch Response Benjamin Abbott G010385-00-R

  15. Closed Loop Pitch Response Pseudo-critically damped position response Benjamin Abbott G010385-00-R

  16. Signal Path for One Optic Benjamin Abbott G010385-00-R

  17. Forward Path for all Vertex Optics Benjamin Abbott G010385-00-R

  18. Return Path for all Vertex Optics Benjamin Abbott G010385-00-R

  19. Vertex Rack Layout Benjamin Abbott G010385-00-R

  20. End Rack Layouts Benjamin Abbott G010385-00-R

  21. Future Work • Finish controls wiring for end stations. • Order Penteks, LEMO connectors and other long lead items. • Request production of custom boards. • Install modules, make and run cables. • Commission suspension electronics. Benjamin Abbott G010385-00-R

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