So this afternoon there was some work on recovering the WE DSP. In the meantime we finished aligning the North arm and we locked without major problems.

During the first part of the afternoon the INJ was a bit unstable most probably due to the works outside the MC building. Once it locked in a stable way, we tried an FMODerr, whose new working point was very far from the previous one.

Once this was done we re-tested the lock of the north arm and we proceed to align the west arm. Valerio informed us that the WE MIR board was not working, but that it shouldn't prevent it from locking (in principle we only use the mirrorrs of the end test masses in LN). However, after we realigned and we tried to lock, we realized that the drift control was not properly working. Indeed only the lines in the WI mirrors were turned on, the ones on the BS and WE were not, and in this way the drift control would misalign the cavity. Paolo checked and there was some flag that was passing through the WE mirror board, so we decided to stop for the day, since we need to fix the WE board problem anyway.

At this point we decided to test the NE ALS loops. They worked fine. We stopped here for the day.