40m Suspension Electronics Benjamin Abbott California Institute of Technology 10/18/01 G R

10/18/01 Benjamin Abbott G R 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 m/  Hz noise requirement.

10/18/01 Benjamin Abbott G R Modeling Modeling done in Simulink Intended to prove that small optic controllers are sufficient for 40m core optics. Noise suppression was evaluated.

10/18/01 Benjamin Abbott G R Simulink Yaw Model 1 / I (where I=M(D 2 /16+L 2 /12))

10/18/01 Benjamin Abbott G R Yaw Controller Model Increased Gain Removed Coil Driver Compensation

10/18/01 Benjamin Abbott G R Open Loop Yaw Response

10/18/01 Benjamin Abbott G R Closed Loop Yaw Response Pseudo- critically damped response

10/18/01 Benjamin Abbott G R Simulink Position & Pitch Model (1 / I)

10/18/01 Benjamin Abbott G R Position controller Gain x5

10/18/01 Benjamin Abbott G R Pitch Controller Gain x5

10/18/01 Benjamin Abbott G R Open Loop Position Response

10/18/01 Benjamin Abbott G R Closed Loop Position Response Pseudo- critically damped position response

10/18/01 Benjamin Abbott G R Position Noise Spectrum m/  45Hz

10/18/01 Benjamin Abbott G R Open Loop Pitch Response

10/18/01 Benjamin Abbott G R Closed Loop Pitch Response Pseudo- critically damped position response

10/18/01 Benjamin Abbott G R Signal Path for One Optic

10/18/01 Benjamin Abbott G R Forward Path for all Vertex Optics

10/18/01 Benjamin Abbott G R Return Path for all Vertex Optics

10/18/01 Benjamin Abbott G R Vertex Rack Layout

10/18/01 Benjamin Abbott G R End Rack Layouts

10/18/01 Benjamin Abbott G R 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.