jeffrey.bartlett@LIGO.ORG - posted 14:29, Monday 04 January 2016 - last comment - 16:15, Monday 04 January 2016(24687)
Lockloss - Due to POP_A_LF Drop
Lost lock at 20:50 (12:50) due to the drop in power in POP_A_LF. Did an initial alignment and was able to relock the IFO on the first try. Back in Observing with 21.7W and 78Mpc. The POP_A_LF signal is still a bit ragged and is just above the IMC-MC2_TRANS signal.
I'm not sure what the significance of this is, or if there is any, but I looked at the pitch and yaw signals for the various optics for today's locklosses, it seems like the ITMY optical lever pitch has behaved similarly to the H1:LSC-POP_A_LF_OUT signal, which is believed to be responsible for our recent locklosses. I've attached two images, one for each lock today. There are many plots shown for the various pitch and yaw signals. The plots in the top right and bottom right are the ones I was interested in.