Still we need more investigation, I started the investigation of the TCam image of especially ETMY, and something for ETMX.
1. Yuzurihara fitting script didn't work
As shown in pdf file, the fitting didn't work well, but mirror position itself would be changed by the duct shield cooling
2. Not only the mirror position, pcal beam and some oplev light position moved
3. TCam itself drifted? Check the beam duct shadow
4. Image of the line like scattered light
From my eye,
1. TCam itself became upper direction (and some rotation?)
This issue come from the image of the beam duct shadow and oplev scattered signal.
2. Mirror itself became upper direction
Due to the cooling down the duct shield, mirror position would be upper direction, but the amount of movement would be smaller than movement of 1.
We will wait the Takahashi-san work.
3. PCal beam became more upper direction
Compared with the movement of 1. and 2. both PCal beams became more upper direction.
Dan-san described that the beam position of the Rx PD became upper position from hardware condition.
We should consider again after the Takahashi-san work,
one possibility is that "the EYA chamber tilted due to the duct shield cooling".
We will search the past log around the cooling of the previous EYC duct shield cooling
-> I summarized the previous TCam image
klog31367, start the duct shield cooling 18th Oct., 2024 gif.2.
gif.3. showed the 296 K -> 250 K small rotating?? by checking the oplev scattered beam
For the ETMY, actually, the mirror position changed, but smaller than the difference from Feb. to Apr. gif.1.
And oplev scattering image moved with the mirror position.
