January 8, 2014 online meeting minutes

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present: Sergey Boyarinov, Ben Raydo, Hovanes

1. HPS preparations 

* Ben presented slides about HPS trigger status {pdf}; CTP replaced with GTP, should be no problems; have 2 GTPs, will test in February and see if HallD GTPs can be used as spare  (twice smaller FPGA), then decide on building another one or not; muon system will participate in trigger in SSP, matching muon cluster and ECAL cluster, will need another GTP; GTP-SSP connection will be 5GBps with 2 lines, 14 FADCs per crate will be better (7 on each side from switch slots); CLAS12 will do 4x2.5 on new GTP;
  • FADC HallD firmware will be used as a starting point for Ben's HPS implementation; if not ready, will discuss it again in 1 month; event-by-event pedestal ???
  • for verification simulated data and FADC playback mode will be used - probably a lot of work here
  • FADC trigger reports every 32ns with 13bit for energy and 4ns timing resolution; integration in readout and trigger will be similar with the same pedestal to make it easy to compare trigger and readout data for verification purposes; gain matching for trigger will provide energy in MeVs; energy spectra histogram (per channel) may be provided
  • CTP and SSP will do cluster multiplicity in 3x3 window (was energy only)
  • FADC and SSP trigger info will be readout over VME bus; GTP will have Linux core aka NIOS processor
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