With Takahashi-san and Hirata-san.

See pictures in the album BS Remedying work after O3.

They redisrtributed the ballast mass on top of the IP uniformly. In order to do this we had to remove the outer end of the magic wand, which was on the way of the arch weights. We need to shorten such a piece by a small amount in order to put it back. Afrer redistribution, some studs, nuts and washers remained unused. The mass that was removed was:

• Studs: 402 g
• Nuts and washers: 122 g
• Magic wand end: 1,106 g
• Total: 1.63 kg

In the afternoon we measured transfer functions.

• The resonant frequencies in L and T were 70 and 101 mHz.
• In the TFs L and  T look largely coupled.

We'll rearrange the masses to try to reduce the difference between those frequencies.