PREX/CREX Thursday, August 14, 2014 10:00am EDT

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Link to the Meeting page PREX/CREX Teleconferences
Last meeting: PREX/CREX Thursday, August 7, 2014 10:00am EDT

The teleconference info is as follows:
       Phone #: +1-888-240-2560 or +1-408-740-7256 and See International Numbers
       Code: 174599135


  • Updates from Rakitha : Neutron Shielding Comparison : Polythene vs. Water elog-2652
  • Updates from Nickie : Optics Plan elog-2653
    • Updates from Guido : Focal Plane from snake [1]

Rakitha, Paul, Nickie, Paul, Dustin, Kent, KK, and Seamus


  • Water vs. Poly discussion
  • Proceed with Water shielding inside the scattering chamber
    • Talk with Al about the geometry/design considerations
  • Possibility of dissolving Borax in water to absorb more neutrons : need to consider about rusting and other issue with using Borax
    • Can we put a Borax+water solution in the hall in beam conditions?
  • The reduction in neutron power and flux after the shielding area (see Table 3 in elog 2952) could be due to missing neutron reflections with poly
  • There could be some resonance activity in Oxygen at around 10 MeV neutrons, which could account for reduction in neutron power at this energy range of 1<E<10 MeV. It is only a reduction in energy and a slight increase in the neutron flux but within errors.
  • Possibility of using glass containers with Aluminium jars filled with water inside the scattering chamber
  • Optics update by Nickie
  • As a short term goal, use Jixie's G4MC to test CREX optic tune because Jixie has already implemented the target and septum for the CREX
    • This will give a chance to get familiar with the code in short term
    • Also this should provide the missing information about the detector footprint like size of the plane and etc.
  • Once the code is setup, PREX setup will be coded. This include the target and septum
  • Sent out a doodle poll to decide the meeting time


  • From Last Meeting
    • Beam parasitic studies needs a to-do list

TO DO Lists

  • We need to have an estimate of how much coulombs used for PREX-I data and an estimate for PREX-II to determine effectively how much more beam time we will use.
  • Have a optic calibration run plan (discussed in 01/16/2014 meeting)
  • It would be nice to have real-time viewer for optics studies in commissioning (disussed in 01/16/2014 meeting)

TO DO Lists link: PREX, CREX