Today we continued with the ITF recovery. Most of the times, unlocks were induced by engaging the SSFS boost.

Here's the summary:

    - We've re-tuned the demodulation phases of B5_QD2_56MHz and enabled the PR loop;

    - Changed the phase of the DIFFp error signal in such a way to flip the sign and enabled DIFFp loop

    - Turned on the COMMp and BS angular loops. Before engaging this latter, Paolo twickled a bit the BS position by hand. 

The interferometer is stable in LN1. The activity is currently focused on the OMC lock.