after having re-aligned the BS I've done a DARM_broad measurement

1346137219  02 Sep 2022 07:00:01 UTC  (02 Sep 2022 09:00:01 CEST) 159

SR tx aligned

1346138058  02 Sep 2022 07:14:00 UTC  (02 Sep 2022 09:14:00 CEST) 189

SR ty aligned
1346138557  02 Sep 2022 07:22:19 UTC  (02 Sep 2022 09:22:19 CEST) 197
1346139095  02 Sep 2022 07:31:17 UTC  (02 Sep 2022 09:31:17 CEST) 221

The sidebands were at the maximum, but I was told to go to 0.4 of CHROCC value, so I closed for fun the SR to unlock.

We manually unlocked and the SR has been realigned using the cross technique

We have locked and changed the CHROCC value to 0.4

looking at the data of the previous lock (where I've aligned the BS by hand) the BS error signal (B1p QD1 50 MHz) was good with a wrong phase of the direction TX.

The good one was 1.3 (as the other direction)

I've engaged the BS tx/ty and it worked fine (minimizing the cmrf).

Then waiting for the CHROCC I've tried to engage the SR. The wp was clearly wrong for the SRC losses (lower 112MHz and DCP) but better for CMRF. It brougth to a negative OS (I had to add a SRCL offset).

After the thermalization of the CHROCC new value (the DCP was 258Hz) we manually unlocked (realigning the SR with the cross technique) and we will start the DAS differential tuning.

The sidebands are lower and the pole is 233Hz (i'm not able to improve it also wit the sr alignment). we manual unlock

We then change the direction of the differential tuning and we relock making all the time the cross for the SR.

the trend of the shift is visibel in figure 2.

Note only one unlock was not driven by hand with manual unlock see Figure 1