PRMI is finally aligned and it is now flashing. This should help us to find the POP beam because of higher intra-cavity power and reasonable alignment.
After PRMI was coarsely aligned, I went to ISCT1 and quickly looked for the POP beam, but no beam was found. I also toggeled the HAM1 POP beam diverter, but it didn't help.
The above plot is an exmaple of time series where you can see that ASC_POP_A goes up to more than 100 counts because of the recycling.
Alignment:
Sadly, we're finding that aLIGO OLs are not as reliable as OSEMs as a long term reference, just like in iLIGO. According to Kiwamu, all previous PR-X alignment efforts were with the BS angle restored using OLs, not M0 BOSEMs.
Richard says that OLs were fine in iLIGO as far as nobody touched anything.