PREX/CREX Mar 7, 2018 10:00am

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Logistic information

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Agenda

1. Modification to skyshine shielding elog:3478: Adam, Kent
   • AZ: increasing the concrete can effectively be used to replace the tungsten block on top of the collimator box
2. Thermal neutron studies elog:3479,elog:3480 Adam, Kent
   • haplog3479
     • KP: talked to Paul about it and considered the effect of the thermal neutrons compared to the EM power
     • KP: boron is a common dopant for semi-conductors, so single event upsets (SEU) could be a significant issue
     • KP: it seems that boron is not that expensive and would help quite a bit so we may want to add it.
     • SR: what is the energy range for thermal? KP: below 1 eV
     • AZ: the energy from the thermal neutrons is about 1 order of magnitude lower compared to EM
     • KP: while this is low we should still worry about SEU
     • PS: was this an issue for Compton? KP: will look into this in the simulation
   • haplog3480
     • KP: we also wanted to look at how much radiation was absorbed by the HDPE (about 1 MGy radiation)
     • AZ: the boron hdpe will absorb about 3% more energy
     • KP: it seems that with 5% boron we get a factor of 2 less thermal neutrons. PS: that sounds low, but maybe they hydrogen absorbs it; we should try to understand it better. KP: i think this is sensible because we are looking at larger range of neutrons where boron is not as effective
3. Collaboration task list Task List
   • KP: working on task list and I encourage everyone to add to it
4. Q1 magnetic shielding simulations: TOSCA/G4
   • KP: we need to get TOSCA running back again and doing some work at UVa
   • KP: we also need to implement the 1 arm b field model into the simulation to see the effect
5. FLUKA collimator region simulations:
   • KP: Victoria is making good progress and we are planning to have an official meeting with RadCon
6. GEM meeting: Seamus
   • SR: for ppl involved with GEMs we will have our first meeting this Friday. All welcome!

Attendance

Dave G, Ciprian G, Adam Z, David A, Victoria O, Devi A, Dustin M, Ryan R, Chandan G, KK, Amali P, Caryn P, Kent P, Eric King, Seamus R, Paul S, Tao Y,

Excused:

Sanghwa P,