On behalf of Takahashi-san whose presence and help today was crucial !!

Participants: Takahashi, Marc, Yuhang, Manuel

Today from around 15h there was a really strong storm in Mitaka.

Issue 1: power shut down.

There was a power shut down (caused by a lightning) while we were doing experiment for few minutes.

We turned off everything but many parameters have to been checked as they have been reset. We didn't yet turn on laser or others electronic devices (We heard some strange sounds we need to investigate).

Takahashi-san was there to help with the compressed air leakage.

All the pumps were also turned off!

He closed the valves of the chambers and of the pipe.

When we arrived at the south end room it was quite hot and humid (similar situation as the other one). Takahashi-san turned the air conditioning on but this might show that it turned off by itself from time to time.

Issue 2: water in central room

Coming back from the end room we found out that a lot of water was leaking inside Tama on an electrical board (probably the general power).

We removed as much water as possible but this shows that there is a leak coming from there. The electric board seem not having any damages.

Issue 3: air conditioning in elec shop

Going inside the electrical shop we saw that one air conditioning system has fallen off the wall. The humidity didn't drain outside so a lot of water was on the floor. We removed 4 buckets of water.

Isse 4: air leakage

Takahashi-san also had the time to fix the air leakage by tightening the joints (without replacing them). When we were there, also other 2 joints in the central room started leaking air. We tightened them as well.

Finally, electricity seems to be back everywhere.

A careful check will be made tomorrow.

Takahashi-san said he will turn on the pumps / open the valves tomorrow.