oli.patane@LIGO.ORG - posted 11:11, Monday 19 May 2025 (84455)
PM1 COILOUTF filters fixed
When we first put together everything for PM1, we just copied all the filters over from RM1(84457). It turns out that the coil drivers for RM1 and RM2 both have had ECRs completed (ECR:E2200307, IIET:24501) that changed the frequency response for the coil drivers, a change which the PM1 coil drivers do not have.
After some troubleshooting (84454), we figured this all out, and so I just went in and updated the COILOUTF filters for PM1 to be what they are supposed to be, which is identical to the filters used in the other HAMA driver top masses that haven't had the ECRs done to them, like the ZMs. Filters have been loaded in.
| Filter | Before (matching RMs) | After (matching ZMs) |
| LPM1 (not used) | zpk([52.32;50.77],[0.5;3174],1,"n") | zpk([9.99999;20.9999],[0.9;211.883],1,"n") |
| AntiLPM1 | zpk([0.5;3174],[52.32;50.77],1,"n") | zpk([0.9;211.883],[9.99999;20.9999],1,"n") |
Images attached to this report
