CountingDaq 220204
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Meeting information
Meeting time: 12:00pm Eastern Zoom connection information Join ZoomGov Meeting https://jlab-org.zoomgov.com/j/1603800887?pwd=aXVmSnN6aWZWN3RBdXB4RUhGckZJdz09 Meeting ID: 160 380 0887 Passcode: 903612 US Tool free phone: (833) 568 8864 Find your local number: https://jlab-org.zoomgov.com/u/ab8341cjcG
Agenda
- Activity updates
- General discussion
- Discussion of C. Cuevas response about new FADC design
- GEMs: APV buffer = 4 mus (David)
- Maybe want to read 6 25-ns windows in APV, as SBS is doing, rather than 3 (David)
Minutes
Recording on Zoom: [https://jlab-org.zoomgov.com/rec/share/bVUSgVAF5mUqGdBQKaYmeGvafTGqbyUE_B-xhDTwUzUUKp3R-N1BHrl8QMAWZNOO.DdF2WRgp-lWjE06B ]
Participants: D. Armstrong, M. Gericke, R. Michaels, C. Ghosh, P. King, B. Moffit, D. McNulty, J. Fast
- Discussion of the FADC: C. Cuevas had sent an email about the Fast Electronics group's plans about the FADC250 redesign; the intention is that the new modules would be a direct replacement of the previous FADC250, just with updated components. Do we want to request different specifications?
- David suggests that since the quartz pulses have FWHM of about 50ns, then there isn't a need to go to a faster sampling FADC.
- Bob brings up that the polarimeter firmware as used on the previous FADC250 was specialized and we should
- The Compton DAQ has used the Struck FADC, and had firmware developed by Struck. We should consider if we'd switch to the JLab module
- Depending on the needs for the polarimeters, we don't have any specific requests related to the
- Question from last meeting: What is the maximum latency for the APVs? The APV buffering time is 4us. This should be enough for us to set up the triggering.
- David would like us to readout 6 samples from the GEMs instead of the 3 samples we had previously proposed. This is the same as what SBS is currently using. This will increase the data size per event; we should look at how that might impact our overall data rates and event rate estimates
- Michael reports that Jie is almost done with the design for the dual-mode amplifier; he asks about the input impedance for the FADCs: they are 50ohm
- I ask if the scintillator would need to have the amplifier in the base also
- David and Chandan think that the scintillators will have enough light that they probably don't need the amplifiers.
- I ask if the scintillator would need to have the amplifier in the base also
- David offers that we could get W&M undergraduates to do module testing work when we get to that point.