[Uchiyama, Ushiba, Nakagaki for making layout]

Abstract:

We started to take care stray light at POP table.
Since the BS after the first lense is clipped IR beam due to its small apature, we replaced it to a 2inch beam splitter.
After that, we realign the optics to PDA1, PDA2, cameras, ad so on but not fully finished.
So, we will continue the work tomorrow.

Detail:

Since we found many untreated strayy light are existing on POP table, we started to take care of them.
First, we checked the beam alignment to PDA1 and PDA2.
Then, we found that the RBS1 in the POP optical layout was clipped the beam.
Since the beam size at RBS1 is large, we gave up to use current BS (1 inch optics) and replaced it to BSW27 (according to klog22015, BS used before replacement was NPPH(+/-5%)Q-25.4C06-20-W0.5D-1064).
So, if there is 2 inch BS from Shigma-koki, it is better to replace later.

After the replacement of the mirror, we realigned the optics one by one by taking care of the stray light.
Though we recovered the alignment to PDA1 and PDA2, we could not finish all the alignment today, so we will continue the work tomorrow.

Note:

Same as TMS-X, I asked Nakagaki-san to make up-to-date optical layout.