DAQ Meeting/20180803

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Logistic information

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Agenda

• Bob : Editing Prex_ts_banks.crl to work and compile
• Ciprian : revive panguin and other online analysis features
• Brad Sawatzky : Github ideas and CODA Networking
• Simona Malace : Understand and test the moller polarimeter DAQ

Minutes

Thinking about Online Analysis with Ciprian and Cameron

• Last known working Panguin and Pan duo
  • Live in apar@adaq3~/PREX/pan/ and pan/panguin/
  • online.c and online.h is the online monitor
  • int main is the main program which creates a root TApp and creates pages based on a config file given as a command line argument
  • config file example: prex.cfg
• Functioning Japan lives in ~apar/ciprian/japan/ and in ~a-onl/pking/japan
  • ~/ciprian/japan/Parity/prminput/prexin.conf is the functioning configuration for the injector that is being used right now
    • Looks at a .map file to map out the detectors in the .crl similar to old PAN control.db
    • There are multiple files now that contain different segments, for modularity
    • Label names in the .map file come out as the branch names in the JAPAN output
  • Then you get a MPS_tree (MPS = one pulse per event, see Meeting notes
    • A lot of the variables currently placed into the JAPAN output files are not necessary for online analysis purposes
  • PANGUIN functionality is to put the root file directly into RAM memory
    • So we should use a truncated output root file to speed up online data lookup - trimmed down analysis outputs exist
  • Startrun script ~/scripts/startAnalyzer_prex is required to run the online analysis (paired down version of regular analysis - runs fast and gives lots of updates)
    • ~/PREX/feedback/panFFB is the fast feedback code - this script reads last N events from the ET directly (rather than the memory resident root file), so it is susceptible to hanging - this feeds data into PANGUIN for online plotting - fast event rates will be a problem and needs to be updated (wont work for MOLLER unless paralleled to death with GPUs etc.)
      • These fast feedback executables will sometimes choose to block the ET whenever sequential events are unable to be read
      • This is so that you can make accurate helicity correlated beam corrections, etc. and not get back results due to pileup
      • We absolutely need to turn it off during production online analysis
      • There is a control.db for fast feedback that you can set to change beam, etc. parameters so that you can study beam quality, etc. in your raw data output
    • Prompt analysis is another analysis which is done automatically at the end of a run and reads the data written to disk (adaqfs)
    • WAC analysis is a third type of analysis is some sort of corrective post-analysis done by hand by Weekly Analysis Coordinators (WAC)
  • There are also some scripts that manage the Green Monster and EPICs to produce non-clean data runs that will be used as automated scans of parameters for beam tests, etc.
• Memory resident root files are not currently functioning as intended
  • We need to write a script that puts files into memory and see if we can then use ROOT to access them
  • online.C inside ../pan/panguin serves as an example
    • GetDrawCommand() function parses a config file
  • How does a root file get stored in RAM memory, and how does root know where is lives in order to access it?
    • fConfig->GetRootFile() finds the root file
    • fConfig is defined in the initialization where it reads the config file

Testing

Today's testing