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| LCGT/subgroup/vis | ## page was renamed from LCGT/subgroup/vis/tama_sas == List to be improved from TAMA SAS experiments == o Inverted Pendulum * Cabling problem: Mechanical loss of the inverted pendulum is dominated by that of the cabling. . Due to the loss, the IPs are over-damped and are spoiled its performance less than 1 Hz region. o Active damping for vertical motions * Because vertical sensors are no good with signal-to-noise ratio, any vertical active damping controls are not available. o Local sensors * Both of LVDT and Accerelometer (ACC) have larger noise levels than these of designed. . Cabling tests including vacuum one are necessary for LCGT. o Initial alignemnts * Most of pico-motor actuators are not operated properly. . (Need an actuator list of TAMA SAS with operation check) * Mechanical clearances and the related actuation ranges should be consistent. * Coil actuator for vertical position adjustment is not available. o Magnet damping * Intermidiate mass of the double pendulum part is over damped. * Mechanical Q values should be less than several hundred, even if active damping controls are applied. o Design Policy * As typical seismic spectrum the worst one should be adopted. |
List to be improved from TAMA SAS experiments
o Inverted Pendulum
- Cabling problem: Mechanical loss of the inverted pendulum is dominated by that of the cabling.
- Due to the loss, the IPs are over-damped and are spoiled its performance less than 1 Hz region.
o Active damping for vertical motions
- Because vertical sensors are no good with signal-to-noise ratio, any vertical active damping controls are not available.
o Local sensors
- Both of LVDT and Accerelometer (ACC) have larger noise levels than these of designed.
- Cabling tests including vacuum one are necessary for LCGT.
o Initial alignemnts
- Most of pico-motor actuators are not operated properly.
- (Need an actuator list of TAMA SAS with operation check)
- Mechanical clearances and the related actuation ranges should be consistent.
- Coil actuator for vertical position adjustment is not available.
o Magnet damping
- Intermidiate mass of the double pendulum part is over damped.
- Mechanical Q values should be less than several hundred, even if active damping controls are applied.
o Design Policy
- As typical seismic spectrum the worst one should be adopted.