KAGRA MIR (Polarization)
HomareAbe - 03:49, Tuesday 21 December 2021 (2757)
Spare ETMY rotated by 30deg
Abe, Matteo,

We rotated spare ETMY by almost 30deg.
We followed the same procedure as before the rotation (as entry 2755).
However, the map at 45deg is not working.
So I made birefringence map without 45deg.
Images attached to this report
2757_20211220194636_131081.jpg 2757_20211220194652_131079.jpg 2757_20211220194713_0deg30.png 2757_20211220194725_8deg30.png 2757_20211220194732_88deg30.png 2757_20211220194738_61deg30.png 2757_20211220194744_86deg30.png 2757_20211220194754_meanwo45deg30.png 2757_20211220194802_s0wo45deg30.png 2757_20211220194810_s1wo45deg30.png
Comments related to this report
MarcEisenmann - 11:11, Wednesday 22 December 2021 (2759)

I checked data especially of the measurement with 45deg input polarization angle.

It seems there was some issue with the calibration of the DC signal (the DC with approximately 45 deg input polarization is higher by a factor 2 than the expected maximum value when we inject pure p polarization).

We will redo this measurement again today.

MarcEisenmann - 15:57, Wednesday 22 December 2021 (2760)

Again issue with the translation stage so we have to remove the mirror to reset the motors reading from Zaber..

I deactivated the windows update for 1 month

MarcEisenmann - 16:38, Thursday 23 December 2021 (2765)

Marc, Michael

To facilitate the removal of the mirror, we used the knob controller of X direction to move the mirror.

After that, we found out that the Zaber reading got good so we started the measurement with 45 deg input polarization angle.