Pengbo, Simon

I changed the HWP holder for the input-polarization control to a motorized one. Now, we have full remote control of the measurements once the system is set up.
However, I noticed that with two motorized stages, the software to control both stages sometimes seems to be a bit slow in responding or does not respond at all (maybe due to the USB-hub?). Apparently, loading the controllers one by one helps and also running a short diagnostics seems to have some effect.

Also attached is the S-pol map (now corrected) from last week Thursday.

Compared with the former results (see elog 1807), we now see a significat reduction in abundance and strength of the vertical stripes. Our initial assumption that those are a result of polarization instability seems to be correct. Althought they are not fully removed, the system with the FI produces now much more presentable results.

Currently, the P-pol measurements are done again with both HWPs motorized.