Type-A SAS Local Control Simulation (Current Status)

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Presentation transcript:

Type-A SAS Local Control Simulation (Current Status) JGW-G1402200-v1 Type-A SAS Local Control Simulation (Current Status) 2014/01/22 T. Sekiguchi

Local Control Strategy (based on Virgo control scheme) During interferometer operation: Resonances of pendulum modes are damped by IP control to reduce RMS. No longitudinal damping is applied at IM. Pitch & yaw of TM are controlled by optical levers. For lock acquisition: Resonances of internal modes are damped by using local sensors (OSEMs) at IM.

IP Control We have not yet achieved required TM RMS displacement (= 1e-7 m). Two disturbing points: Notch at 0.16 Hz in actuator response of IP Glowing sensor noise of geophone at low frequencies http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=2132

IP Control Open loop gain Notch at 0.16 Hz

IP Control Sensor Blending

Optical Lever Control Preliminary Optical lever control is applied to reduce RMS of mirror pitch & yaw: Preliminary

OpLev Sensor Noise Contribution Assuming optical lever sensing noise of 3e-11 rad/rtHz (at 10 Hz). (estimated from analogue electronics noise used in i-KAGRA) Pitch and yaw: OK, but noise coupling to Z is large. Large coupling from pitch actuation to zTM: can it be mitigated by actuator diagonalization?? 10 times larger than requirement

OpLev Sensor Noise Contribution Pitch OK

OpLev Sensor Noise Contribution Yaw OK

Local Damping with OSEM Check damping time of resonances (Z and Pitch) GAS Filter Tilt Mode

Displacement Noise During Damping Assuming OSEM sensitivity of 2e-10 m/rtHz @10 Hz (measured in prototype at room temperature)

Future Works TBD Requirement for inertial sensor noise Requirement for local sensor noise at IM (used for damping) Requirement for actuator noise Simulation about other DoFs (transversal, vertical, roll, yaw)