This is the present status of the implementing the IP controls for Type-A. The inertial sensors consist of the geophones (ACC) and the folded pendulum accelerometers (FLDACC). These signals are blended at 100mHz in the L and T directions. In the Y direction, FLDACCs are not used but only ACCs are used. Phase correction filters were employed to correct the phase deviation from the ideal sensors. The inertial sensors are blended with the LVDTs at 50mHz in the L and T direction and 110mHz in the Y direction except for ETMY owing to the EYA problem. Some inertial sensors employed the correction filters to compensate for the cradle effects.

The high-power coil driver (HPCD) is still used for the FLDACC in ETMX. It should be replaced. Since the ETMY has been recovered, the 50mHz blending will be implemented in ETMY.