oli.patane@LIGO.ORG - posted 17:52, Monday 27 July 2026 - last comment - 08:49, Tuesday 28 July 2026(91267)
BBSS SDFs sorted
Elenna, Oli
We spent some time figuring out SDFs for the BBSS. It should be all good to go.
A couple of notable channels that will need to be figured out at some point are:
- H1:SUS-BS_M2_DRIVEALIGN_Y2L_GAIN: For the BSFM this gain was set to 11. Since we had inputs coming in for this filter we decided to commit it as a gain of 0 until we verify the gain that needs to be there
- H1:SUS-BS_M2_OLDAMP_{P,Y}_GAIN: For the BSFM the P gain had been set to 300 and the gain had been set to 650. We seemed to be doing okay with that value, but something must've changed while we were consolidating SDFs that made it so we started saturating the M2 DAC. So we turned both these gains to 0 and will need to figure them out.
I've attached a pdf with the full list of sdf diffs that we accepted. The notable channels listed above are highlighted as * and **
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Just want to add a note that for MICH locking we have been doing so successfully without oplev damping. We'll have to monitor once we get to PRMI and DRMI locking, but for now leaving the OLDAMP gains at zero is ok.
The Y2L gain seems like a spot position change, but I'm not aware of any spot position control on the beamsplitter specifically.