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Hibiki Obata - 16:02 Wednesday 10 December 2025 (35823) Print this report
Ring down Q-value measurement of pitch resonances of ETMX/ITMX/ETMY/ITMY

2025/12/08

[Obata, Komori, Yokozawa]

This is the report on the Q-value measurements of the blade springs in the four Type-A suspensions.
We measured the Q-values of the pitch modes, which are the most critical for suspension thermal noise.

 

Over all gain in awggui of the excitation : 10

ETMX : 02:17:15 UTC, K1:VIS-ETMX_NBDAMP_P3_OUT_DQ
ITMX : 06:33:20 UTC, K1:VIS-ITMX_NBDAMP_P3_OUT_DQ
ETMY : 09:47:30 UTC, K1:VIS-ETMY_NBDAMP_P3_OUT_DQ
ITMY : 06:33:20 UTC, K1:VIS-ITMY_NBDAMP_P3_OUT_DQ

Measured Q-values are as the table and the pictures.
Compared to the previous measurements (3248432476), they aren't much different.

 

measurement this time previous measurement
  Temprature (K) Resonance (Hz) Q-value fitting error of Q
EX 39.2 7.443 9.7e3 2.5e2
IX 91.2 7.371 1.1e4 2.2
EY 56.1 7.441 2.1e4 87
IY 37.4 7.461 2.4e4 44
Temprature (K) Q-value
87 9.6e3
88 9.8e3
87 1.8e4
88 1.8e4

 

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