Aug 18, 2015 Cal F250
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Contents
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
- Announcements
- Action Items
- Updates
- Discussion
- Any other business
Minutes
Attendees: Elton, Dave, Beni, Sergei, Matt, Eugene
- Announcements
- Action Items
- 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)
- 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.
- 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:
- flexibility to specify beginning of integration window after the threshold crossing
- access to pedestal records obtained asynchronously (during synch events) for monitoring of baseline drifts
- 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)
- Any other business