After the earthquake in Japan, we relocked at the first trial and after we arrived LN3_SQZ we started to tune the noise injections for the PSTAB loop (both at LF and HF). After the amplitude of the noise was tuned, we added the corresponding functions into the "injection_SSFS.py" script.

We then proceeded to repeat by hand the two last injections of the SSFS loop, that last shift made the ITF unlock. We decreased slightly their amplitude, while checking that the coherence with Hrec was still high. Now the script launches: CLEAN SSFS_UGF PSTAB_LF PSTAB_HF and then the 4 other SSFS injections at lower frequencies (down to 100 Hz). The operator launched the script and it worked without any problem. Figure 1 shows the injection corresponding to SSFS_UGF, and I think the current UGF is safe enough (I wouldn't push much higher, to ensure robustness, unless the noise injections suggest that it is limiting).

At this point we passed to the DIFFp topic. We started by opening the DIFFp_TX servo loop (which zeros the offset!), and then we started to put back the offset. However this didn't zeroed the new signals and so we continued to increase the offset. During this scan we tried to tune the phase, slightly, even if it was already quite good. Then we repeated the same operation with the TY loop. Figure 2 shows the two scans that we did. For the TY the phases were not clear so we left the deafult ones.

The phases we put are:DIFFp_TX_DCP_HF_mag_B1_phi0 = 0.5;       DIFFp_TX_DCP_mag_B1_phi0 =0.5