with K.Tanaka and Uehara

We measured the beam profilers of the path to the QPD for the ASC in the optical tables of IMC_REFL and IMC_MCE_TRANS.
We measured four different locations, from M5 to QPD2 and M7 to QPD1 of IMC_REFL, from BS3 to M3 and from M4 to QPD2 of IMC_MCE_TRANS.
The BS3 to M3 measurement is an alternative to the BS3 to QPD1 measurement.
The horizontal axis of their measurement results shows the distance of each optical system. (IMC_REFL_QPD1 is zero point at M5, IMC_REFL_QPD1 is zero point at M7, IMC_MCE_TRANS_QPD1 is zero point at BS3, IMC_MCE_TRANS_QPD2 is zero point at M4)
The vertical axis shows the beam diameter.
Major and Minor are the major and minor axes of the elliptical beam cross section.
I am currently analyzing the measurement results.
One thing we noticed in our measurements is that the beam shape is elliptical. In particular, comparing BS3 to M3 and M4 to QPD2 of MCE TRANS, the beam shape is completely different.
Previous measurement results：
IMC_REFL:https://klog.icrr.u-tokyo.ac.jp/osl/?r=8612
IMC_MCE_TRANS:https://klog.icrr.u-tokyo.ac.jp/osl/?r=8724

Figure 1-4: Measurement results.
File 1: IMC_REFL optical table (https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9964)
File 2: IMC_MCE_TRANS optical table (https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10144)
File 7: Diagram of the beam cross section at 120 cm from BS3 in IMC_MCE_TRANS.
File 8: Cross section of the beam at 80 cm from M4 in IMC_MCE_TRANS.