Something worth noticing concerning the long lock of yesterday is that the cavity power was much lower than the previous attempts.

Figure shows the cavity power (B7/B8_DC) and the B4_12_MHz and B4_112MHz.

One can see that at the begining of the lock the power in the cavity follows the usual trend but after a few minutes dropped at 13:13 UTC and become noisier and then keep lowering up to the moment where the NE_Ty was moved (not visible in the plot).

I don't know what causes the cavity power to drop but it is not related to the opening of the galvo loop that happened 9 minutes later at around 13:22.

It is also noticeable that the B4 12MHz and 112MHz magnitude is increasing while the cavity power is decreasing but I cannot say if it is related.