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Seismic Attenuation System ( SAS ) for LCGT

Inverted pendulum: 30mHz 3 cascaded GAS filter: 500mHz Test mass suspension: triple pendulum. Seismic Attenuation System ( SAS ) for LCGT. Transfer functions computed with a rigid body model -20dB @100mHz V-H coupling dominant @10Hz Safety margin of over 50. SAS Control

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Seismic Attenuation System ( SAS ) for LCGT

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  1. Inverted pendulum: 30mHz 3 cascaded GAS filter: 500mHz Test mass suspension: triple pendulum Seismic Attenuation System (SAS) for LCGT Transfer functionscomputed with a rigid body model -20dB @100mHz V-H coupling dominant @10Hz Safety margin of over 50

  2. SAS Control • Active Damping of Mechanical Resonances • Digital Servo using Commercial Control System • Sensors • 3 Horizontal Accelerometers (ACC) • 3 Horizontal LVDTs • 1 Vertical LVDT • Actuators • 3 Horizontal Magnet-Coil Actuators • 1 Vertical Magnet-Coil Actuator Seismic Attenuation System (SAS) for LCGT ACC Actuator LVDT

  3. History of SAS R&D International collaboration with Caltech and Univ. of Pisa • Started TAMA-SAS study in 2000 • R&D of IP and MGAS filter at Caltech by 2001 • R&D using SAS prototype at Univ. of Tokyo by 2003 • Started manufacturing of SAS for TAMA300 in 2003 • Installation of SAS into TAMA300 in 2005 Seismic Attenuation System (SAS) for LCGT Schedule of TAMA-SAS installation R&D at Caltech

  4. R&D using 3m FP prototype Isolation of 10-11m/Hz1/2@4Hz RMS velocity of 0.3mm/s Seismic Attenuation System (SAS) for LCGT SAS prototype in the 3m Fabry-Perot cavity

  5. Test in TAMA300 To 4 Test Masses Installation: 2005 Observation: 2006 Seismic Attenuation System (SAS) for LCGT SAS for TAMA300

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