Π polarizability Meeting May 11, 2022

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09:30 EST (JLab time) Weekly Meeting

REMOTE during Covid-19

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Topic: CPP Weekly Meeting
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Action Items

  1. Check with Justin about loading translation table into ccdb. (Beni) Translation has been uploaded to ccdb and checked with a few of the latest data files.
  2. Produce vertex distributions using MC to verify the software is be available for full/empty target commissioning (Andrew)
  3. Check that there is a visual confirmation of target position (Beni/Elton) The Hall D camera on the west end can be used although the focus is not very good. We will need to add a flag to allow visual check of target position.
  4. Ask Mark Dalton to conduct a training of the FCAL dark room for personnel that will adjust the Pb frame. We will find a time when 2-3 CPP persons and FCAL experts can meet with Mark Dalton and Tim for training on positioning of the Pb picture frame absorber.

Preliminary Agenda

  1. Previous CPP meeting: May 4, 2022
  2. Previous CPP Software meeting: Π polarizability Software Meeting May 5, 2022
  3. Announcements
  4. Action Items
  5. CPP-NPP Trigger (Sasha)
  6. CPP and NPP Run Conditions
  7. Photon beam / tagger / diamonds
  8. Software/Calibration, Simulations
    • hdview2 event display
    • data skims and quick analysis feedback (polarization, vertex)
    • monitoring (David)
  9. MWPC Testing
  10. CPP and NPP Experiment Configuration
  11. DAQ and Electronic Setup (Sergey and Beni)
  12. Documentation (Elton and Simon)
  13. Other business
  14. Next meeting

Minutes

Attending: Alex, Albert, Andrew, Beni, David H., David L. Elton, Eugene, Igal, Ilya, Nikhil, Rory, Sasha, Sergey, Simon

  1. Previous CPP meeting: May 4, 2022
  2. Previous CPP Software meeting: Π polarizability Software Meeting May 5, 2022
  3. Announcements
  4. Action Items
    • Most resolved; see list above.
  5. CPP-NPP Trigger (Sasha)
    • There have recently been 2 failed Flash250 modules with a blown fuse. (These can be fixed, but the failure cause is not known)
    • The F250 cards were found to have considerable debris (dirt) collected and may be the reason for the failure. See Log Entry 3993462
    • Beni provided a NIM signal for the CTOF front-panel trigger and Sasha connected the input to the trigger supervisor. Log Entry 3993455
    • Elton: How to adjust the thresholds for the neutral trigger? Sasha: The production GlueX trigger can be used as a basis and modified by adjusting thresholds. Note: The PRIMEX trigger uses higher threshold settings (about 3.5 GeV, compared to the 0.5 GeV threshold in the FCAL for the normal GlueX trigger).
    • Elton: What trigger to use for the CDC calibration? Sasha: Naomi has contacted him and should be able to start with the standard GlueX trigger and see how effective this trigger is to select good tracks in the CDC.
    • Elton: How much time is needed to commission the trigger? Sasha: About 2 shifts.
    • Beni: The TOF will need to be gain matched before the final TOF trigger is adjusted. He will need to do a voltage scan in steps of 25 V on the TOF pmts to gain match them.
  6. CPP and NPP Run Conditions
    • The list of data needed was updated by Elton.
    • Rory: Need to take amorphous data? David H. noted that amorphous data is needed to normalize the spectra to determine the polarization. We decided that the 10% amount of data taken by GlueX is a reasonable target. Alex: The amorphous data is needed for normalization of the spectra in the monitoring. For final polarization measurement with the TPOL it is not needed, except for checking systematics.
  7. Photon beam / tagger / diamonds
    • Elton: The diamond alignment will be discussed at the Beamline meeting this afternoon. For any procedure we will need quick feedback on the polarization.
    • Alex: The shape analysis was recently performed by Justin and Mark D. We should make sure that this tool is available during commissioning.
  8. Software/Calibration, Simulations
    • hdview2 event display. No recent update
    • data skims and quick analysis feedback (polarization, vertex)
    • Andrew is working on the vertex distribution, but jobs are taking too much time. Simon: Has a general vertex reconstruction using track pairs that can be used.
    • monitoring (David)
    • David: Showed monitoring plots of FMWPC pedestals and high-level histograms with pi/mu PID response, energy spectra and angular distributions.
    • Simon: Is working CTOF hit factory and calibrations. Will add timing histograms to the online set.
    • GENERAL NOTE: All software should now be merged directly into the master branch. Discontinue use of the CPP branch as a general rule.
  9. MWPC Testing
  10. CPP and NPP Experiment Configuration
  11. DAQ and Electronic Setup (Sergey and Beni)
  12. Documentation (Elton and Simon)
  13. Other business
  14. Next meeting
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