Cheryl, Rahul

Last Tuesday (12/17/2019) changes were made to the monitor filters for ETMY mode 18, 1000.298Hz (which is very close to ETMY mode 20, 1000.301Hz). We adjusted the band pass filter (while making sure that the bandwidth is not changed) for the same.  After making the changes we clicked Load (in the violin mode medem screen). However, the next day Dave found that CDS (H1CDS_03OVERVIEW_DETAIL_CUST.adl) was complaining about the new values. To make this go away and also to make sure that the new settings were properly accepted by the Guardian, we had to click LoadCoefficients. 

CDS was also complaing (diff H1SUSPROC_126072365, see fig attached) about some difference in ETMY mode 12. However, we couldnt find any difference and later Dave just made it go away.

We also adjusted the gain for damping the follow modes ETMY: 12, 18 and 20 and/or to speed up the damping, which worked. Later in the evening Cheryl applied zero gain to some of the other modes in ETMY (filter bank 2, I will check with Cheryl on the mode number and then update this alog) since the monitor levels were low (and it seems like they were feeding noise into the IFO).

In the last week or so, several other changes have also been made in the violin mode damping settings (basically Guardian values were changed), along with adjusting the monitor filters. This is still ongoing, however I am giving a small summary (of modes which worked and the gains were modified in guardian) which will help us keep a track of things.

ETMY mode 12, 18, 20, gain = 0.5

ETMY mode 11, gain = 50

ETMY mode 6, gain = 0

ITMX mode 8, gain = -4, fliter change (moved it away from mode 7)