Fig.1 shows the comparison between the RIN transfer function (input beam -> B1_DC) measured yesterday (2023,04,07,19,26,00) and that measured last week (023,03,29,20,46,50).

The input RIN is computed as PSTAB_PDd_AC_MONIT/ (11*12*PSTAB_PDd_DC), while RIN_OUT is simply B1_DC/mean(B1_DC);

The TF has been compensated for the DARM closed loop (/virgoDev/ISC/matlab/DARM_loop_TF.m).

The coupling seems reduced by about a factor 2.

Fig. 2 shows the CMRF (DARM_SSFS_LINE_mag_100Hz) comparison in the two moments. The fluctuation is quite large but the mean values are respectively 2.7e-9 (old measurement) and 1.3e-9 (new measurement). This seems in agreement with the amplitude noise coupling reduction.