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takafumi.ushiba - 21:12 Thursday 09 December 2021 (19153) Print this report
Suspension transfer function check of ITMX for health check

Abstract:
I checked the measurement results of klog19134.
ITMX transfer function seems healthy.

Detail:
I checked TF measurement results.
Red and blue represent the results after and before finalization, respectively.
Basicaly, all TFs are fine.

Followings are some notes of TFs.
*Coupling from IPL excitation to IPY below 0.1Hz becomes larger (fig1).
*Coupling from F0 GAS excitation to F3 GAS below 0.1Hz becomes larger (fig4).
*Coupling from BFT excitation to BFY becomes larger (fig10).
*Coupling from BFV excitation to BFY becomes larger (fig11).
*The lowest resonant frequency of BFY changes from 20 mHz to 30 mHz. It is probably due to the heat link connection (fig14).
*Coherence of MNL measurement becomes better at high frequency (fig15).
*Coherence of MNY measurement becomes better at high frequency (fig20).

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