## 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.