MOLLER Pion Background Meeting Thursday, September 22, 2016 3:00pm EST

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Previous Meeting: MOLLER_Pion_Background_Meeting_Thursday,_September_15,_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. WM ELOG Pion sim 67
  • 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. (See image below)
  • Any new business?
Initial pion detector geometry concept.


Attendees: Kurtis, Mark P., Seamus

Not Attending: David, Wouter, Scott, Jacob, KK, Rakitha

Scribe: Kurtis

  • Based on the need for this meeting to become weekly, many people have found this time inconvenient. So I will be sending around a Doodle poll to find a new meeting time.
  • Mark P. mentioned that the original MIE proposal budget was large enough to include a six septant coverage with additional GEM planes for neutral identification/rejection at least for the Moller detection region.
  • More thought is required to really determine if we need full phi coverage or is a reduced number of pion detectors will suffice.
  • What Pi-/e- ratio do we need?
    • This is the driving question that will effect the cost of the lead wall for the upcoming Directors's budget review.
    • Scott's summer simulation results have been used to determine an initial pi-/e- ratio. He has already done simulations using the Wiser pion and Moller generators from 10 to 300 mm of lead wall thickness. At 250 mm, we see about a 1:1 pi-/e- ratio. New simulations are required beyond 250/300 mm to accurately determine a pi-/e- ratio greater than 1:1.