Π polarizability Meeting Jan 12, 2022

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Revision as of 17:12, 12 January 2022 by Elton (Talk | contribs) (Minutes)

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Meeting Time And Location

09:30 EST (JLab time) Weekly Meeting

REMOTE during Covid-19

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Action Items

  1. Generate MC samples of pi+pi- (Elton and Andrew)
  2. Make a pull request for hdds (Simon)

Preliminary Agenda

  1. Previous CPP meeting: Jan 5, 2022
  2. Announcements
    • Bluejeans being phased out between now and end of January. New system will be ZOOM.
  3. Action Items
  4. CPP-NPP trigger
  5. Microscope move (in progress)
  6. Software/Calibration for CPP (David, Alex and Sean)
  7. PID + AI
    • Data for AI (Andrew)
  8. CPP and NPP Readiness Review
  9. MWPC Testing
  10. CPP and NPP Experiment Configuration
  11. Electronic Configuration (Beni)
  12. hdgeant4 updates (Mark)
  13. Software consolidation (Simon)
  14. GlueX Data Analysis
  15. CPP Simulations
  16. Other business
  17. Next meeting

Minutes

Present: Albert, Andrew, Beni, David H., David L., Elton, Ilya, Mark, Richard Jones and Daniel Prather (UConn), Rory, Simon.

  1. Previous CPP meeting: Jan 5, 2022
    • The minutes from last week's meeting was reviewed as there were only a few participants.
  2. Announcements
    • Bluejeans being phased out between now and end of January. New system will be ZOOM.
  3. Action Items
    • Elton will generate some pi+pi- events with the current software
    • Simon submitted a pull request for hdds; it is still waiting.
  4. CPP-NPP trigger
    • Log Entry 3966089 Swing Shift Summary 12/19/2021
    • Log Entry 3966194 CPP Tests
    • Log Entry 3966193 Run 90646
    • The file with waveform data is available. Ilya will check for rates and compare to previous runs.
    • Sasha needs to download the TOF trigger firmware to the hardware.
    • Sasha and/or Serguei will need to run the data through the emulation in 'replay' mode to check the trigger. Ilya will check with them on their schedule/plans for this analysis.
    • There was some discussion of this at the bi-weekly Hall D staff meeting on Monday.
  5. Microscope move. [Note this discussion occurred at the time that Richard and Daniel joined the meeting]
    • Tagger microscope has been reconfigured. James McIntyre supervised the operation and passed on the information to Daniel. Jim has returned to UConn.
    • Richard and Daniel are fixing some electronic preamp boards, which will be installed into the new setup.
    • Hall D staff will move it into its final location later today.
    • There have been some improvements to the light coverings of the microscope, which should make it easier to access electronics.
  6. Diamond for CPP (Richard)
    • Richard (and his team) tested diamonds at the light source at Saskatoon in December. These are thick diamonds and were tested before thinning.
    • The Type III (electronic grade) diamond generated a disappointedly wide rocking curve and is not expected to produce sharp coherent peaks seen in some of our diamonds.
    • The other two (?) diamonds tested (1.2 mm) generated very high quality rocking curves. However, there are several steps required before a thin 50 um diamond that could be used for CPP (or GlueX). The sequence of tasks needed to produce a (50 um) physics diamond are roughly: slice diamond into three wafers (200 um after material removed) / re-test for quality / thin wafers down to 80 um / re-test for quality / polish wafer down to 50 um / test final sample. Testing requires scheduling and use of an X-ray light source, which often takes months to schedule. In principle, testing is not required at each stage, but that is the best way to control the process.
    • The use of these new diamonds does not appear to be feasible before June.
    • The alternative is to use and existing JD103 diamond (already mounted in the goniometer). It has a broad rocking curve, which will lead to a degraded coherent edge. It has not yet been checked in Hall D. Nevertheless, it could still provide a high polarization. It appears this is our best (only) option for running CPP this summer. We should check with Hovanes and Alexandre for their opinion on using this diamond.
    • One can simulate the shape of the coherent edge using the pixelated light source data and convoluting it with the electron beam profile. We should find a "volunteer" to work with Richard to build an online tool to do this kind of simulation,
    • [Aside note: Richard has a proposal for using Hall D as a test location for diamonds using "parametric x-rays", but that is a longer term project.]
  7. Software/Calibration for CPP (David, Alex and Sean)
    • David is planning (hoping) to work on the software this week. Nikhil is out for the next couple of weeks.
    • Andrew has a working version of the halld_recon CPP branch.
    • Albert had some issues getting a version working, but these are now resolved.
  8. PID + AI
    • Data for AI (Andrew)
  9. CPP and NPP Readiness Review
  10. MWPC Testing (Rory, summary of work in early December)
    1. Log Book Entry 3964344
    2. Grounding was investigated to reduce noise.
      • Two MWPCs were found to have high noise during testing: Frodo and Galadriel and compared to a quiet chamber (Arwen)
  11. CPP and NPP Experiment Configuration
  12. Electronic Configuration (Beni)
  13. hdgeant4 updates (Mark)
    • There was considerable discussion about the sequence necessary for generating a group build for hdgeant4 for use with CPP. Mark, Simon and Andrew were going to meet following this meeting to decide on a plan.
  14. Software consolidation (Simon)
  15. GlueX Data Analysis
  16. CPP Simulations
  17. Other business
  18. Next meeting