Ushiba, Tanaka
This morning, after the MCE TRANS work in klog31985, we took photos at the MCE TRANS table when we locked only IMC like klog31962. we found some ghost beams on some mirror holders (fig.1,2,3,4), but they seem not to be on the wall.
Also, we measured the power after L1+400 (MCE TRANS layout), and the power was 0.410 mW when IMC output power from MCo was ~1 W. If we increase the input power to 10W, the power increases at most 4 mW. So it looks like we don't need to deal with the ghost beams here for now.