Reports until 16:01, Wednesday 18 March 2026
H1 SQZ
sheila.dwyer@LIGO.ORG - posted 16:01, Wednesday 18 March 2026 (89557)
looking for the filter cavity alignment

Sheila, Gabriele, Camilla

The squeezer wasn't initially aligned to the filter cavity yesterday.  This morning I dither locked the OPO and rastered the alignment of ZM2+ZM3, and saw some IR flashes on SQZ-FC_TRANS_D_LF_OUT_DQ (IR at FCES), but this misaligned the beam so that it didn't make it back through the VIP to SQZT7.  I spent some time trying to walk FC1,2,ZM3 to get flashes and the beam on SQZT7, partially sucsesfully, now Camilla has done this same walk with FC2 misaligned and found both the transmission to FCES and the beam on SQZT7 at the same time.  

Gabriele and I went to the FCES to look for beams with cards, we weren't able to see anything.  However, when we got back we realized that the green beam wasn't injected at that time, so we will have to go back.  Camilla is still walking beams now, and we will return to FCES in the morning.