We performed the tapping test at the PSL room.
1. Tapping the optical table at various places
We touched the optical table with various place.
One large signal was detected when we touched around new high power laser(Fig.1. in URL)
In other part, some small signal detected, but not related in existing peak
2. Tapping the leg of the optical table
There are some signal, but not related in existing peak
3. Touching the cable for accelerometer on the output periscope
With the advise of Akutsu-san, we touched the cable for the accelerometer on the output periscope, but no signal detected.
4. Rack for laser, electronics
No signal was detected
5. Beam duct for output
When we touched the beam duct toward the output to PSL room, very large signal detected (Fig.2. in URL)
When we injected the white vibration using vibrator, the excess signal became smaller, that imply the low frequency signal up-convert to high frequency(Fig.3. in URL)
The figures are placed in
https://dac.icrr.u-tokyo.ac.jp/KAGRA/DAWG/Detchar/klog/klog24584
Obviously, the signal of both pit and yaw became larger and only pitch have coherence
