[Raffaele, Manuel]

We took a viewport shelf from the IMC end mirror vacuum tank, and placed it on the south-east viewport of the BS vacuum tank.

We assembled an optical lever to test the components. Since the mirror is placed at 45°, the laser cannot reach the center of the mirror because of the suspension leg in front of the mirror. So we pointed the laser to about half of the radius of the mirror. The PSD position is about at the center of the viewport. We could see a good signal of X and Y channels (we jumped on the floor), but the "Total" channel saturates at 15V, because the laser power is too high. Putting an OD filter in front of the laser makes the signal do not saturate anymore.