MOLLER Pion Background Meeting Wednesday, October 12, 2016 3:00pm EST

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Previous Meeting: MOLLER_Pion_Background_Meeting_Wednesday,_October_5,_2016_3:00pm_EST

Meeting Information

BlueJeans Call Information


Phone Number: 1-800-240-2560

Meeting ID: 624029893


  • Scott: Implementation of lead wall and strawman pion detector. [1]
  • Jacob: Starting to work on pion simulations.
  • Initial plan: Implement single septant pion detector behind lead wall.
    • To be placed behind Moller ring to begin with.
    • Lead tungstate(PbWO_4) blocks.
    • Wouter's initial concept of the pion detector geometry.
  • Any new business?


Attendees: Jacob M., Kurtis, Cip, David, KK, Dustin, Rakitha, Scott, Seamus, Mark P., Wouter

Not Attending:

Scribe: Kurtis

  • Neven's note/tungsten possibility
    • David: Looking over KK and Mark's notes from past meeting. Also will be looking at the Neven's latest results regarding the use of tungsten instead of lead for the wall section. Really only looking at coverage for the Moller ring.
    • KK: Maybe use tungsten from the Moller ring coverage. Then the low cost lead could be used everywhere else.
    • David: Currently working Happex style of detector(lead and lucite) cost estimate, really the cost will be related to the gems.
  • Looking at WM Dilbert ELOG 69
    • Elog with the purpose of answering Paul's questions regarding the energy spectrum of the pions.
    • Minor mix-up with the plot 1 and plot 3, attachment 1 should replace plot 3. This will be changed.
    • KK: Collamators should cut between 0.6 and 1.2 m in R.
    • Possible structure in the second plot, couldn't be electro-production as we are currently using the Wiser code for this development.
    • KK: Need to really think how to make the correction for the pion background by making the measurement beyond the lead wall.
    • David: Could benchmark pion measurement by doing measurements with two different lead wall thicknesses then taking the ratio.
    • David: Would like to have the main detector barrel merged back into the master. So that everyone else could use it.
    • KK: Main quartz detector not really a problem, really need a stand-in for the shower-max detector.
    • Dustin: Still working on the shower-max, currently 2 cm of tungsten. Just put in a tungsten disk for now. Stony Brook students (Cameron, Sakep?) can give the z positions for these items. Scott should just send an email.
    • KK: Now the next major step is the getting the trajectories of these pions for pointing back to the main detector rings. This will directly effect the GEM chambers design/coverage.
    • 28.5 m for ring 5, 50 cm up-stream of the ring.
  • Wouter's starting detector design
    • Take a look at the previous meeting's minutes.
    • 5 segment design, made from lead tungstate. Simplest option to start out with as it only requires single volume.
    • Sandwich detector design a bit more complicated but could also possibly be more cost efficient.
    • Both designs would still require a wall in front.
    • Simpler design would only require a single PMT, no light guides.
  • Rakitha - Have working calorimeter in remoll-solid. Might be able to port over. Rakitha has offered to help.
  • KK - Should think about making a cartoon detector design for Javier.