[Murakoshi(Aogaku) , Yuzurihara]
We started the lockloss investigation on 2025/02/11. The other plots are summarized in wiki.
OMC PD started to oscillate with 45 Hz
I discussed with the Kenta-san about the cause. He doubted the DARM control, because the controls for other DoF has the much lower or much higher unity gain frequency.
Osillation with ~1.1 Hz at ITMY pit
The tuning for ITMY pitch was done at Feb. 13 (klog). So, I hope this will not happen again.
- 2025-02-11 03:42:24.812500 UTC, GPS 1423280562 (Fig) (Fig)
- 2025-02-11 04:20:39.562500 UTC ,GPS 1423282857 (Fig) (Fig)
OMC PD started to oscillate with 20 Hz
I discussed with the Kenta-san about the cause. He doubted the DARM control, because the controls for other DoF has the much lower or much higher unity gain frequency.
- 2025-02-11 15:29:21.937500 UTC, GPS 1423322979 (Fig)
Slowly reducing the transmitted power over 5 s
Sometimes this phenomena was observed. I will collecte more statistics and investigate details.
- 2025-02-11 23:03:42.187500 UTC, GPS1423350240 (Fig)
IMC length control had trouble
IMC length control looks like having the trouble at tha time. The oscillation frequency was ~5Hz.
- 2025-02-11 23:26:29.562500 UTC, GPS 1423351607 (fig)
