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MarcEisenmann - 10:50, Monday 07 August 2023 (3308)Get code to link to this report
long measurement

The measurement started in elog 3295 finished.

It consists of about 6.3 millions couples of votlages applied to LC1 and LC2.

Figures 1 to 3 reports the resulting polarization states which is similar to previous measurement despite the 90 deg rotation of LC1.

Somehow we have an overall phase difference of 90 deg as before. I'll cross-check simulations.

When measurement finished, the LCs temperature was about 31degC. This indicates a stronge heating as the usual LC temperature is about 24 degC before heating for temperature control.

This seems to be related to the air conditioning failing noticed by Takahashi-san that could also explain the strange power fluctuations of the FDS laser reported in elogs 3306 and 3307.

Images attached to this report
3308_20230807034010_polarotfull.png 3308_20230807034015_polaretarfull.png 3308_20230807034019_polagenfull.png 3308_20230807034736_rotatinghwpgen.png 3308_20230807034740_rotatinghwpretar.png 3308_20230807034743_rotatinghwprota.png