corey.gray@LIGO.ORG - posted 00:03, Wednesday 14 September 2016 - last comment - 01:40, Wednesday 14 September 2016(29682)
EVE Shift Summary
(Sheila, Terra, Jenne, Matt, Lisa)
Locking Notes:
Had some grief with H1 locking.
- DRMI would lock, but had issues with engaging ASC (so we would tweak up the alignment by hand, enter Guardian commands by hand, and then skip the actual Guardian step to get to DRMI_LOCKED.
- Had issues with a very dead looking Michelson (small ground motion). Tried various things (PRMI, pushing the BS, lowering trigger values for MICH, etc.)
Before the issues above, managed to get some high power locks to Terra for PI work.
SEI_CONFIG State Change Due To EQ
Additionally, while attempting to lock we had a 6.0 EQ in Colombia which peaked at 1um/s. I was a few minutes slow, but took the SEI_CONFIG to EARTH_QUAKE_V2 before the noise got to 1um/s.
- 7:32 EARTH_QUAKE_V2 selected (from the default WINDY state)
- 7:55 WINDY selected
Facilities Note: Noisy Air Conditioning Unit (one closest to entrance) was making a bit of noise. Bubba was contacted, and this should be addressed tomorrow. (he said we could turn it off and open the hallway doors if it was too noisy....but we never got to that point.).
We are having another EQ now (a 6 in the Solomon Islands). We were riding out the first waves OK (we got through the peak of 0.3um/sec on the BLRMs) and then tried EQ mode v2. I think that switching to earthquake mode blew the lock. :(
We switched back to windy mode because ALS looked better that way, and made it to DRMI ASC by the time the R waves hit and blew us out of lock. Switched back to windy more at 8:22 UTC, when the EQ band blrms were back to 0.2-0.1 um/second. The attached screenshot shows a couple of trials of switching back and forth between EQ and windy more while trying to lock. It seems that at this level of ground motion, EQ mode v2 adds too much angular motion in 0.1-0.3 Hz for ALS to handle. (see JIms alog)
Other than the EQs the ground is quiet, no wind no useism.