1 / 5

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

easter
Download Presentation

Seismic Attenuation System ( SAS ) for LCGT

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related