General Meeting Summary 7/12/18

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DISCUSSION OF TCS PAC PRESENTATION DRAFT AND COMMITTEE QUESTIONS

  • General feedback: keep answers short, avoid introducing additional material
  • Suggestion: Include question from committee on the slide and present an answer for it
  • Details on selected questions
  • Theory - higher twist contribution: possible sign change analogous to that in SIDIS, enters with different sign, measuring two different processes allows to access experimentally
  • CPS - committee questions are really not about CPS, but optimization of experiment and reduction of background in detectors, e.g.
  • Background in tracker hodoscope, which is low energy photons from photon-target interactions. Solution of inserting plastic "filter" in beamline outside is a solution - heating not a problem, but need to study additional backgrounds
  • Target fringe field - working on it
  • Calorimeter, e.g.,
  • Calibration - neutral pion decay can give in-situ calibration (as done in SANE experiment), in DVCS used hydrogen too
  • PID and rates - what is the trigger rate for calorimeter?
  • Need proton detection for experiment, high rate capability is important and smaller paddles or GEMs can do that. However, most important question is where to find signal - solution could be tracking (hit + direction information) through magnetic field, identify tracks pointing to the target based on momentum predicted by calorimeter based on exclusivity
  • DAQ and trigger - NPS plans to use fADCs (concept similar to HPS), add cluster triggering
  • Data analysis and observables:
  • target spin observables, opportunistic measurements of cross section and beam spin asymmetry
  • present as constraint on CFF, and in particular in relation to GPD E - translate error bar of experiment into error bar on E and compare to H (with different Ju, Jd parameterizations)


NEXT MEETING: THURSDAY 19 JULY at 9:00 AM (EDT)