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CAL (General)
Shingo Hido - 18:44 Friday 06 June 2025 (34090) Print this report
Weekly calibration on June 6

CAL group

We did the calibration measurements and haven't found strange results.

Estimated parameters in the Pre-maintenance measurements are as follows.
 H_etmxtm = 3.87175e-14 @10Hz  ( -0.1% from previous measurements)
 H_etmxim = 1.55407e-14 @10Hz   ( -5.5% from previous measurements)
 Optical_gain = 2.187716e12          ( -0.5% from previous measurements)
 Cavity_pole = 17.99656 Hz            ( -0.4% from previous measurements)

Previous values are listed in klog#34048.
Fig1. shows the fitting results of pre measurements.

Estimated parameters in the Post-maintenance measurements are as follows.
 H_etmxtm = 3.878432e-14 @10Hz  ( 0.17% from pre-maintenance measurements)
 H_etmxim = 1.589672e-14 @10Hz   ( 2.3% from pre-maintenance measurements)
 Optical_gain = 2.191044e12            ( 0.15% from pre-maintenance measurements)
 Cavity_pole = 18.04787 Hz              ( 0.28% from pre-maintenance measurements)

Fig2. shows the fitting results of post measurements.

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Comments to this report:
takahiro.yamamoto - 19:05 Friday 06 June 2025 (34097) Print this report

After the calibration parameter updates, we confirmed only changes are foton filters for optical gain and actuator efficiencies (Fig.1) and SDF tables (Fig.2-3) for pcal beam position (klog#34095) and line tracking (klog#34096) parameters.

There is no update in guardians (Fig.4) and models (Fig.5), so we skipped the check with lockloss-relock cycles by guardian. After then, we raised CFC_LATCH in order to move from CALIB_NOT_READY to READY.

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