[Suresh / Kiwamu]
We did the 2nd round of the PRM reflection mode scan on Friday.
It seems that the PRM curvature maybe correct if we look at the vertical mode, however but the horizontal mode doesn't seem to agree with any of the expected lines.
In order to increase the reliability of the measurement, we need to confirm the beam profile of the incident beam by looking at the IP-POS beam.
Right now Suresh and Keiko are mode-scanning the IP-POS beam.
The plot below shows both the expected beam profiles (see the detail in #6444) and the actual data.
We did the following things prior to the measurement.
I have estimated how the mode profile of the PRM reflection should be, as shown in the plot blow.
A conclusion here is :
we should be able to constrain the PRM curvature situation if measurements are precise and accurate enough with a level of less than ~ 100 um