BLTWG Meeting 11/25/2019

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  • Time: 11:30 EDT
  • JLab meeting room: A110, Hall D counting house
  • Connecting: detailed instructions are here
  • Conference id: 536076821
  • Present: Richard J., Alex D., Sasha S., Curtis M., Eugene C., and Elton S.


  1. Announcements
  2. Photon beam polarization
    • Processing of 2018 TPOL data - Michael D.
    • Systematics studies with 750um converter data, 2018 data - yet to come
    • Update on hadronic asymmetries
    • TPOL readout at high rate - Sasha
  3. Tagging accidentals estimation
    • plan for tagger intensity scans - Richard
  4. Priority issues for immediate focus
    1. tagger energy scale adjustment - Sasha, Richard
    2. evaluation of beam flux systematic error (spectrum, normalization) - any
  5. Preparation for the Fall run
    • changes needed after gluonXX os upgrade - Richard
    • hot check-out
      • TAGH - Sasha
      • TAGM - Richard
      • TPOL - Mike
      • TAC - Sascha
      • PS - Sascha
      • active collimator - Richard, Alexandre
      • upstream profiler - Hovanes
      • goniometer - Hovanes
  6. GlueX NIM paper discussion
  7. Diamond radiator status
    • new diamond procurement - nothing to report
  8. Any other business


from Michael Dugger

Where I am at with the 2018 polarizations: I almost have all of the 75 micron convertor files for the Spring 2018 and Fall 2018 runs. There are fewer than 100 individual files that are missing. I have run a preliminary analysis with the files available and everything looks OK. I have not encountered any unforeseen issues. I expect to have the finalized polarizations given to the collaboration within 2 weeks from now. I'll report on this during the next beamline meeting.

Take care, Michael

From Stuart Fegan

I'm also unable to attend today; one of my new meetings clashes with the meeting time. With regard to the NIM section, I've implemented most of Alexandre's proposed corrections, and working on the remaining ones in my free time. I've also started placing some of Dan's tagger field analysis archives onto the docdb.

Still waiting on some requested inputs from Alex A (rho asymmetry as polarization monitor), Justin (historical use of ANB fitting in GlueX commissioning/phase I) and Richard (diamond selection). There's a couple more people I need to reach out to for some minor clarification of one or two more details (installation of the Tungsten plate, descriptions of the high and low current BPMs, etc.) and the merging of sections 2.8 (TAC) and 2.9 (flux normalization), which has been suggested by several people.

Sounds like a lot, but it is coming together nicely, and I'm happy to continue to lead this while I settle into my new post. Cheers,