After the maintenance we proceed to the implementation of the normalization of the SSFS loop, to avoid the unlocks due to the combination of ITF cold + feed-forward of PRCL/SSFS. For this purpose Alain added the possibility of multiplying the present normalization by the ratio between the B4 112MHz and the maximum value of this channel when in LN3. This option is engaged with a switch called B4_DC_rescale, which is turned on when we reach LOW_NOISE_1 (line 2928). We also set the value of the maximum value in the previous lines (line 2926, 2927), and it is read from the ITF_LOCK.ini, section LOW_NOISE, variable b4_112_max. The switch is then turned off in the DOWN state (line 590).

We tested one lock acquisition, we set the UGF to 9kHz and it failed. WE tried again and we adjusted it to a more higher gain, around 10400Hz (b4_112_max = 0.00756), and it worked. So for the moment we let it implemented. If it does not work, it is enough to comment th eline 2928.