Stefan, Elli

After maintenance day today there seemed to be a lot of changes to the interferometer confirguration, so we decided to try to lock the full interferometer to check this still works.  When requesting Check_IR in LSC_Lock guardian, the ALS_COMM was not finding the comm beat note.  The IR buildup in the x-arm (LSC-TR_X_A_LF_OUTPUT) was 0.7 rather than 1, and guardian would not recognise the IR resonance.  We suspected a bad alignment but we did the initial alignment twice (getting an x-arm buildup of 1  at the input_align step) and repeating the initial alignment didn't help.  In order to push on to ALS_DIFF, Stefan was lowering the LSC power scale from 3 to 2W (IMC input power stayed at 3W) so that the guardian would rocognise the comm beatnote.

Once IR comm and diff beat notes were found, we brought the LSC power scale back 3W and let DRMI lock.  DRMI would catch lock but soon after the ASC loops engaged they would break the lock.  PRC1 broke the lock twice, so Stefan turned off  the PRC1 loop, and could keep DRMI locked for a bittle longer, but then SRC2 took it down.  These are the two pointing loops.