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Reports until 16:38, Wednesday 10 September 2025
H1 IOO
sheila.dwyer@LIGO.ORG - posted 16:38, Wednesday 10 September 2025 (86841)
IMC locking difficulty after power outage: MC2 whitening in error (and many other whitening chassis)

writting this down for future people recovering from power outages:

We weren't able to lock the IMC, the alignment was not good but not terrible.  With 2 Watts into the IMC, H1:IMC-TRANS_OUT16 was about 10000 counts, while the IMC was well aligned it was 11000 counts.  MC2 trans NSUM however was about 6 counts, well it should be 200-300 counts. 

On the whitening screen for MC2 trans (LSC> Whitening) there were errors Invalid data chn (4,3,2,1).  Elenna found this alog by searching the error message, 12120, Daniel Patrick and Fil reproduced a solution like this. 

 

Displaying report 1-1 of 1.