We have done two tasks : 8MHz increase from -6dB to 6dB and SR tx gain increase from 2 to 10.

8MHz:

the first trial has been ruined by a glitch on the SR tx error signal, but we have still used that lock part for getting the correct scaling of the IB tz and ty gains.

Then we have repeated the same action by opening the angular controls for SR.

In  Figure 1 the comparison from -6dB (purple) and 6dB blue. It is visible that the SNR has been improved as expected. In Figure 2 we can see the trend.

SR tx gain:

during the recovery of the alignment after the glitch of SR tx error signal we profited for testing the higher gain. It worked properly. We did also in an aligned ITF a step of 0.5urad to test the new loop convergence speed. see fig 3.

After that we manually unlocked to test the new lock acquisition with the following changes

ITF_LOCK.ini

lline 166 pr_x_gain  from 30 to 5

line 168 pr_y_gain from 15 to 1.5

line 182 mod_ampl_8mhz from -6 to 6

line 493 sr_tx_gain from 2 to 10