N. Satō, Akutsu

We looked for unexpected ghost beams around OMMT2 with sensor cards and an IR viewer.

So far

1. A tiny beam spot, which would come from OFI. In the attached pic, it can be found at the left edge of the aperture of the beam sheild.
2. A streak-like ghost beam found at the upper right of the aperture of the beam shield (again see the attached figure). I firstly tought it is also related to OFI, but seemed not. Maybe from OSTM AR? where I saw electric wires for OSEMs were somehow sticking out...