Aug 18, 2015 Cal F250

Video Conferencing Information

Meeting Time:

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Participant Direct Lines

• JLab Phone: in CC F326 is 757-269-6460 (usual room)
• JLab Phone in CC L207 is 757-269-7084
• Phone in the Regina Video-conference Suite is 306-585-4204

FA125's Useful Links

• FA250 modes 2 from Ed and Hai, Feb 18 2014
• FIRMWARE for FADC250 Ver2 ADC FPGA, Sept 2014?
• Format doc version 5.06, 23 June 2015
• Timing algorithm wiki page - updated to include latest revisions
• Data format for 250 modes on fADC125 from Cody, Aug 15 2014
• FDC_pulse_data_format
• CDC readout needs Garfield calcs

References

• Media:FADC125 DataFormat v5 06.pdf
• GlueX-doc-2752 fADC250 Operational Characterization: Air Flow, Temperature and Pedestals
• GlueX-doc-2776 Addendum to fadc250 firmware specifications
• GlueX-doc-2788 Considerations for firmware updates to the Flash 250 for FCAL and BCAL

Action Items

• Review abnormal conditions and how to deal with them.
• Request way of specifying the start of the integration window after the threshold crossing
• Consider integration window referenced to the peak (instead of the threshold crossing).

Tentative Agenda

1. Announcements
2. Action Items
3. Updates
4. Discussion
5. Any other business

Minutes

Attendees: Elton, Dave, Beni, Sergei, Matt, Eugene

1. Announcements
2. Action Items
3. Discussion of Sasha's format
   • Serguei: Request reserving a data type which can be used to tag extension of versioning
   • Serguei: Request that versioning be incorporated into the data stream. David: Could treat version numbering in the same way that Nsa and Nsb, writing out once per crate
   • Discussion regarding the loss of checking in present format. Would like to make sure that checksums or lengths are easily available in the secondary readout lists
   • Separate raw samples from new data type (see below)
4. Pedestals
   • Serguei explained how they handled pedestals in a previous experiment. Attempts were made to optimize the pedestal determination based on the noise frequency: baseline shifts as seen from temperature changes, low 60 Hz type noise, intermediate kHz noise from power supplies, and perhaps very high frequency noise due to pile up.
   • Elton: Our main pedestal noise is the high frequency sigma=1.2 counts seen in every fadc window. Our main problem stems from the baseline shifts due to temperature. We do not see evidence for 60 Hz noise. There is a component (>1 kHz) that contributes about 0.3 counts of shifts in the mean pedestal event to event. Pileup effects have not yet been studied, but may contribute as we push to higher rates.
5. Conclusions
   • Feed comments from calorimeter discussions into Sasha's document so it can be used as a basis for requests to the fast electronics group
   • Requests include:
     1. flexibility to specify beginning of integration window after the threshold crossing
     2. access to pedestal records obtained asynchronously (during synch events) for monitoring of baseline drifts
     3. Remove raw data from new data type and pass on in current format using bit 31=1 and type=4 data type. (This keeps the bit=31 for use as data definition record. It will also allow bit 30 to be used to distinguish integral/time)
6. Any other business