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VIS (EX)
masahide.tamaki - 5:32 Tuesday 15 November 2022 (22907) Print this report
Contribution of local-control noise to the DARM sensitivity

After several change of control (klog22767, klog22824...), I did the noise budget for local control in Type-A cryogenic payload.

.xml files which shows measured transfer function (from {SUS}_MN_{DOF} to DARM) can be shown in /users/Commissioning/data/NoiseBudget/TFs/2022/1114.

The calculated contrl noise with Pastavi noise budget tool are shown below.

Fig1

Fig1 shows the all noise contribution I measured this time.
► From this, we can say Length and Pitch control in EX mainly determine local control noise in Type-A payload (⇒ next main work).
► It seems to be good to optimize EX Y, IX L, IX Y and EY Y control.
► Control change for IX P and EY P seems to work well (compared to the results in klog22513).
► IY R control noise level is really low.
► Next time, l will measure TF in broader freq.

Fig2

Fig2 mainly shows local control noise in EX payload (Y: indigo, P: purple, L: darkviolet).
Orange line is summation of the noise except for EX.
It is still clear that EX L and P are quite noisy.

(Fig3 shows the plot without EX -- just reference)

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Comments to this report:
tomotada.akutsu - 9:08 Tuesday 15 November 2022 (22913) Print this report

Good progress!

It might be nice if we can also do overlap plotting the best CLIO sensitivity, for example, as a reference for the works > Yuzurihara-kun

so that we can clearly see (at least) to what extent possible to reach the low frequency sensitivity.

hirotaka.yuzurihara - 10:33 Tuesday 15 November 2022 (22914) Print this report

Akutsu-san, thank you for your comment. I implemented that feature to plot CLIO's best sensitivity curve. The data was provided by Uchiyama-san. (Thanks!)

 

Tamaki-san, you can select the (hidden) option from the blow table, see the attached figure.

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