First, I set the PAY_FLOAT state and add the oscillation(0.1 Hz) to TEST channel of the ETMY MN (100 cnt in Yaw and 500 cnt in Pitch)
Fig1. and Fig.2. showed the result when I added the oscillation.
The conclusion is that there are not large clipping inside the QPD range.
1. Overview of the QPD SUM (Fig.1.)
As shown in Fig.1., the decreasing of the SUM (green) started.
2. Starting time of the decreasing SUM (Fig.2.)
The starting time seemed 6th September, 2024(JST) as shown in Fig.2.
From checking the klog and daily commissioning schedule, only one activity in Yend
klog30995 (Turned on the TMP at Yend).
At this timing, most commissioning worker performed the ASC activity at control room.
Interesting one is the starting the decreasing SUM with increasing the oplev glitch (RMS became larger) as shown in Fig.3.
3. Small bump in 9th Sep. (Fig.4.)
In this timing, I changed the target temperature of the oplev light source(klog31031).
4. some bump in 10th Sep. (Fig.5.)
I cannot find the critical work related this change.
5. Stopped the decreasing SUM around 20th Sep. (Fig.6.)
Around the 20th Sep. the pressurization work were performed at EYC.
6. Sudden increasing the SUM at 1st Oct. (Fig.7.)
I cannot find the related work around Yend (ASC work ongoing)
Anyway, my conclusion is the oplev light source was unstable before the cooling down,
duct shield cooling may not affect the oplev SUM
radiation shield cooling made the small clipping at the radiation shield view port, and fixed it yesterday.
