PREX/CREX Thursday, August 7, 2014 10:00am EDT

Link to the Meeting page PREX/CREX Teleconferences
Last meeting: PREX/CREX Thursday, July 31, 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

Agenda

• Discuss outstanding issues related to engineering
  • Updates from Engineering : Thermal Calculations for Collimator (from Whit) elog-2650
• Updates from Rakitha : Neutron Shielding Comparison : Polythene vs. Water elog-2651

Present:
Rakitha, Bob, Paul, Nickie, Paul, Dustin, Kent, KK, Lorenzo

Minutes

• Bob will contact Whit to rerun the simulation with power inserted at the correct region. In his initial work seen in elog-2650 (see link above), in attachment 1st slide 4, the heat is inserted not at the correct region.
• Other concerns about the heat study,
  • Use of square water channels compared round channels. KK raised the issue about non-uniformity in square channels may leave zero velocity regions in the copper surface. This may results in residue build up and eventually clog the water flow
  • Just make sure engineering is aware of this issue and they have experience with square water channels before.
  • Is the 4 GPM rate can be handled at the current cooling systems? Do we need an additional water pump to achieve this rate?

• Water as a replacement for poly inside the SC
  • Initial results show water and poly are equally good at shielding but poly has slight advantage over water due to 30% more hydrogen in the poly. We can overcome this if we increase the water volume.
    • In terms of moderation or absorption, C or O have almost zero cross section to neutron. So it is mostly hydrogen that does the job. Due to larger fraction of H in the poly, it does a better job in containing low energy neutrons.
  • Rakitha will run the simulation longer to get better statistics on neutrons so we can compare neutron fluxes between poly and water

Misc.

• 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