We measured 2 things to check a scattering light effect.
The 1st, we measured tilt sensor amplitude with shaking. We shook in 2000cts, 5000cts, 20000cts amplitude, and frequency is 1Hz. This results are attached.
The 2nd, we measured it with hitting pylon and vacuum chamber by a hand. This results are also attached.
If there are some scattering light effects, we can see the signal in a wide range in these graphs, but we can't. So we think there are not any scattering light effects.
And we find that the signal when we were hitting the vacuum chamber is very similar to one when we were not hitting and fans were off. But we didn't turn off the fans then. We don't know why.
