Jeff K, Krishna V.

After scrounging for the right connecting links between the vacuum chamber and the ion pump, we finally started pulling vacuum on the chamber in the afternoon, around 4 PM, with a pumping station (Turbo pump backed by a diaphragm pump). By the 7:30 PM, the pressure at the Turbo was down to about 6E-6 torr.

The balance was centered on the autocollimator and we are taking data overnight. One side of the foam box is open for the vacuum hose so there is a lot of low-frequency drift due to temperature noise. Plots to follow soon.

Tomorrow, we will repeat the 'transfer function' measurement to confirm the small distance between CoM and the suspension point/pivot.