Simulation Meeting September 12 2019 1030AM ET

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Simulation Task List Updated 2019

• Simulation tasks (new) File:MOLLER Tasks List v8 Sim.doc
• Simulation tasks Task List by Dustin
• Simulation tasks Task List by Rakitha
• Main detector simulation tasks Task List by Michael

Agenda

• Follow up on Geometry updates from CAD design
• Simulation task updates: What needs to be done in immediate future
  • Finalized the G4 geometry
    • Beampipe Design Studies [1] [2] [3]
  • Estimate the radiation load at the detector area
• Simulation software updates:

Attendance

Attendance: Rakitha, Sakib, Wouter, Michael, Dustin, Chandan,

Minutes

• Beampipe updates by Sakbi
  • Showed detector area photon background above 1 MeV from different beam pipe configuration. Mostly coming from beam-pipe with no Helium designed by Dave at spectrometer engineering group at JLab
  • Slit scattering in col-1 and stray field effect in the beam pipe.
  • Using Tungsten beam pipe reduce the background by a factor of 30
  • Need to improve magnetic shielding
  • What's the Moller and ep signal in the same units as shown for photon background? Sakib will get back with numbers so we can compare background to signal
  • In vacuum only design we need the tungsten shielding around collimators but with helium gas, we will need a beam pipe
• We have to discuss use for He to save money vs increase in the background and then find ways to reduce that background
• Software updates by Wouter
  • Updated envelope into the develop branch and other features to develop branch
  • New release 2.0.0 with most recent geometry updates
  • Go over the to-do list in the git repository and find what needs to be done and update the list

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