[Georgia B, Elenna, Oli]

Last Friday I reported that the alignment to OMCA was decent, 89674. However, I had aligned OMCA with an HR and then removed it to align OMCB. On Monday, I tried placing a beamsplitter at the same location so I could simultaneously align OMCA and OMCB, but then I didn't have enough power for both. I then tried to fix the upstream fiber, which at first went horribly, but now we are getting 50 mW to align with, so overall things have improved.

Today, Oli and I began to realign the beams to the OMCs, since so much changed upstream. Georgia then later tagged in to help me. For alignment, we have about 33 mW to align OMCB and about 17 mW to align OMCA. This enough to see flashes on the card at the DCPDs.

Summary: we see flashes at the DCPDs of OMCA and OMCB. These flashes look pretty good overall. The beam is not modematched to the OMCs, so the flashes look mostly like mode mismatch.

We used the IR sensitive camera to take long exposure shots of the DCPDs to capture a long average of the flashes.

Here is a picture of both DCPDs of OMCA. There are some blobs that indicate the alignment could be a bit better, but overall it looks pretty good.

Here is a picture of DCPDA of OMCB. This mostly looks like mode mismatch, so again, decent alignment overall.

I have also attached videes of the OMCs flashes on an IR card.