We acquired the new RFC_8MHz_I channel into LSC_Acl and used it to restore the CARM_SLOW loop; its phase has been adjusted and the value saved in the SIB2_Photodiodes process. Then we closed the loop and it worked with the same parameters as with the 6MHz error signal, as their SNR are similar, but we needed to add a little offset to the loop (-0.035) after looking at the signal when the RFC was still locked on the INJ side.

However we noted that such loop, which has not been optimized for noise/science mode yet, quite spoiled the correction on the ITM in the region where the dither lines are (see the Figure, purple is with loop engaged). Therefore we disabled it for the time being but we can now work on its improvement and test it during lock acquisitions.