Washimi, R. Takahashi, Aso, Akutsu

Summary

Four black sheild plates, which were detached the other day (29804), got back. Unfortunately due to some less inter-communication, some black-head screws could not come back to the original positions, but I gave up further efforts to help the situation.

Details

After some optical and mechanical adjustment have done (to be reported by someone separately), we re-installed the black shield plates that had been detached the other day (29804) onto the OMMT1 (Figs. 1-2) and OSTM (Figs. 3-4) suspension structures.

Unfortunately due to some less inter-communication (see 30031, which is a comment to 30030), some unexpected issues happened.

• Maybe some screws that were used for these shield plates were mis-used to attach the other shiedl plates in 30030.
• Maybe some spring washers were used, even doubly used during 30030.

As a result, two screws were missing for fixing the shield plate to the side of the OSTM suspension structure, while a certain number of flat washers were left... I have no idea where they should be. This shuold not happen if one would do things properly. Of course mis-assembly might be fully un-avoidable, but at least, such mis-assemblying should be reported, if any, but I could not find any of them. I could not help anymore such situation, so I gave up; the uncovered screw holes seemingly metallic silver, which should not be appropriate for stray-light mitigation, though.

Remaining stuff

• Do not forget to get back one beam dump that were also detached the other day. See 29804.