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tatsuki.washimi - 12:58 Wednesday 15 February 2023 (23968)

Shaker injection for the OMC chamber

[YokozaWashiMiyoki]

We performed the shaker injection for the OMC chamber

Images attached to this report

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23968_1676433958_Screenshot from 2023-02-15 12-21-41.png

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23968_1676434028_Screenshot from 2023-02-15 12-24-10.png

Comments to this report:

tomotada.akutsu - 14:16 Wednesday 15 February 2023 (23972)

Thanks, can you also input the shaking at the frequency range like in https://klog.icrr.u-tokyo.ac.jp/osl/?r=23955 ? I am also interested in the up conversion.

tatsuki.washimi - 14:45 Wednesday 15 February 2023 (23974)

I compared the ASDs for the accelerometer located on the OMC leg.

Images attached to this comment

tatsuki.washimi - 14:47 Wednesday 15 February 2023 (23973)

Dear Akutsu-san,

We tried it but our shaker couldn't generate enough power less than 200Hz because the background level of the ground vibration is large now...

(This plot)

tatsuki.washimi - 16:26 Wednesday 15 February 2023 (23977)

I summarized the results of 100-600Hz shaker injection.

exploration lines are drown by eye

Images attached to this comment

tatsuki.washimi - 16:54 Wednesday 15 February 2023 (23978)

I calculated the expected noise spectrum when the ground vibration becomes 2020-level, by the following equation

$DARM_\mathrm{expect}(f) = \sqrt{DARM_\mathrm{inj}^2(f) -DARM_\mathrm{ref}^2(f) } \times \frac{\sqrt{\int ACC_\mathrm{2020}^2(f)df } }{ \sqrt{\int[ACC_\mathrm{inj}^2(f) -ACC_\mathrm{ref}^2(f)]df } }$