Reports until 21:12, Sunday 21 April 2019
H1 PEM
robert.schofield@LIGO.ORG - posted 21:12, Sunday 21 April 2019 (48658)
2 hours of PEM injections

Philippe Nguyen, Robert Schofield

This time we cut it close from the other side of a candidate: we delayed starting PEM injections until 10 minutes after a candidate (rather than ending 10 minutes before). Then we learned of the candidate and stood down.  When we were able to start again, we made acoustic injections in the LVEA and PSL, searched for the magnetic coupling site around HAM3 and made impulse injections on the input arm. We also injected at MX. Unlike last time, we did not see any coupling to DARM at MX, other than glitches when we banged the cryopumps - probably from particulate.

This brings us to a total of 12 Hours. We have several more hours of work to do, hopefully tomorrow.

Times (UTC):

21:47 – 22:15

23:20 – 0:28

2:53 – 3:20