Dave, Jeff, Oli
Model-wise, BSFM is good to damp for IAS work and the QOSEMs are ready to test using the BBSS overview screen found on the sitemap under BS / ITM -> BBSS (temp). Channel names for the old beamsplitter (BSFM) are the same, and channel names for the BBSS are 'SUS-BBSS'. This is temporary - once the BBSS is installed, its model will overwrite the current BSFM model.
Yesterday Betsy, Jeff, Tom, and I came up with a plan for how we want to test out the BBSS, QOSEMs, and build up the BBSS infrastructure while keeping the BSFM (currently on the test stand) damped for now. The plan can be found at T2600169.
The first part of the plan required figuring out how to split up the BSFM electronics with the BBSS in a way that allowed us to keep damping the BSFM while also having sufficient electronics for testing the QOSEMs. I built up a temporary BBSS model called h1susbbss.mdl and compared it to the h1susbs.mdl, as well as using the 2026 google slides in G2301306 to compare the ADC and DAC lineup for the BSFM vs BBSS.
Model needs
BSFM
M1: Damping aka ADC and DAC
M2: Not needed
M3/OPLEV: Oplev not needed
BBSS
M1: Readbacks for QOSEMs aka ADC
M2: Not fully necessary
M3/OPLEV: Not fully necessary
M1
Since we needed to have damping available for the BSFM, we needed to keep the ADC to BSFM M1 as well as the BSFM M1 to DAC how it's been. Luckily, the BBSS M1 QOSEMs use different ADC channels, so we can still have readbacks for the QOSEMs. The readouts are supposed to go to the same DAC channels as the BSFM M1 readouts, so I've terminated these outputs, but that's okay since we won't be wanting to drive the coils for a bit. After BSFM work is done, we will be putting the BBSS on the test stand and taking transfer functions with BOSEMs first, so this setup also means that we'll be able to use the BSFM model (WITH DIFFERENT OSEM2EUL MATRIX VALUES) to take those measurements before needing to swap to driving those CDs/DACs with the QOSEMs instead. The QOSEM connections were done according to the proper order of F1 F2 F3 SD LF RT (D080273). The BOSEM connections in the BSFM model were NOT changed, and so are currently F1 F2 F3 LF RT SD.
M2
Regarding M2 for each suspension, we don't need M2 on the BSFM anymore, so I've taken those ADC and DAC connections away. I've connected them to the BBSS model though. We obviously don't need them now but they will be good to have already ready.
M3 / OPLEV
Similar to M2, on the BSFM I've disconnected the ADC -> OPLEV connections since we don't need them anymore. For the BBSS, I connected up M3 OSEMs, but I did not connect the ADC -> OPLEV since the channels that the OPLEV uses with the BBSS are the same as the first four channels of ADC -> BSFM M1, which we still want.
To make sure the BBSS model channels would be named correctly, I renamed the BBSS block from BS to BBSS. I also removed any IPC channels in the BBSS model that will be needed in the future, and also removed these IPC channels from the BSFM model to be safe, even though it probably would've been fine.
Updating h1susbs model
h1susbs was updated with the changes listed above (r35127), built, and installed. before vs now
Turning "h1suslo12" into "h1suslo12 but actually it's for the BBSS/QOSEMs"
h1susb2h34 has a model running called h1suslo12, meant to be for LO1 and LO2. Since neither of these suspensions are currently needed, Dave decided it would be easiest to install the BBSS model as an updated h1suslo12 model instead of removing h1suslo12 and replacing it with h1susbbss. To do this all we needed to do was change the dcuid in h1susbbss to h1suslo12's dcuid of 188, and then copy h1susbbss over to overwrite h1suslo12. h1suslo12 was built and installed with these changes (r35136). before vs now
Dave documented installing these models in 90043.
Guardian notes (tagging GRD and OPS):
The SUS BS guardian has been STOPPED to keep it from doing anything weird. Please leave it stopped. There is no SUS BBSS guardian, and we don't want there to be. We will be controling both suspensions manually.
