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IOO (Laser Bench)

masayuki.nakano - 18:37 Friday 24 November 2017 (3689)

Seismic motion measurement on PSL table

I measured the seismic motion on PSL table. I used a Rion acceralometer and screwed on the PSL table (see attached picrture)

I attached the plot with KOACH on and off. Also I attached the coherence between the acceralometer signal and IMC error signal. There are coherences around 10 Hz and 0.5 Hz, which is caused by KOACH and micro seismic motion.

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Comments to this report:

keiko.kokeyama - 19:38 Friday 24 November 2017 (3693)

Do you think the high-ish coherence around 0.1-1 Hz is from the actual seismic motion?

Using your information I also looked at the coherence between the acc and the MCE trans QPDs. There are coherence again 0.1-1 Hz especially in YAW (attached), and a 0.05 Hz. I didn't see any coherence between the acc and the PSL IP QPDs.

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