Evan, Gabriele

Both the SRCL and MICH error signals showed a lot of low frequency residual motion. We implemented two boosts that give us a lot more gain at low frequency. We've been testing the SRCL boost few times in the last days and it always worked. Today we managed to engage the MICH boost a couple of times without problems. See the attached time series and spectrum comparisons.

The boosts are installed as FM1 in MICH and FM5 in SRCL. They are NOT autromated in the guardian.

Infected by the boost illness, we decided that DARM could have more too. Since we saw no good reason for the reduced low frequency gain, we modified the pre-existing boost, increasing the low frequency gain as shown in the third attachment.