Meeting 27 March 2018

PRESENTATIONS

Result for backward shielding and optimization of shielding overall (Parker/Bogdan)

CPS Update (Jixie)

Initial draft 10-page document

NOTES

* Action items for next meeting on Tuesday, 10 April at 3:00pm (EST):

• Prepare drafts for all sections of the 10-page document (all, see section assignment)

• Prepare figures for the 10-page paper based on Parker's 3/27 presentation (Parker/Bogdan)

• for slide 17: figures for both "original CPS shielding" and "CPS shielding" (i.e. with the +10 cm and borated poly, the "extra" case) for combined, photon, and neutron separately.
• for slide 18: figures labeled with:

• "Combined with CPS shielding"
• "Gamma contribution with CPS shielding"
• "Neutron contribution with CPS shielding"

• and then the same plots assuming 11 GeV beam, 2.7 muA beam current and a 10% radiation length target, i.e., there is no CPS or shielding at all.

• "Combined without CPS and shielding"
• "Gamma contribution without CPS and shielding"
• "Neutron contribution without CPS and shielding"

• Update on ongoing simulations with "black hole" after stopper and figures for 10-page document (Jixie)

• Discussion FLUKA simulation

• Fixed issue with dose rates - it was due to an incorrect modeling of the beam dump opening. Now get more realistic radiation from that source

• 1 MeV neutron equivalent now in good agreement with expectation from 2012 simulations performed by Pavel

• Dose rate at 100 uA consistent with corrected Snoopy neutron detector data (900 mrem/hr)

• Optimization study with 50 cm W and 10 cm of 5% borated polyethylene for top, front and back - this is extra 10 cm of W and extra 10cm of borated polyethylene in the backward region. The extra 10 cm plastic stops spilling n the backward region
• To demonstrate effectiveness of shielding plot dose rate vs. distance with and without CPS
• Show radiation levels on pivot after nominal 1000 hrs and 1 hour waiting, and also after 100 hrs and 1 hour of waiting

• Discussion of simulation update

• Implemented "black hole" after stopper, simulation is running

• Disussion of 10-page document draft

• General concept is: 1) Introduction of subject, 2) CPS concept, 3) Results to demonstrate that CPS can be built

• Need to include sufficient quantification, e.g. factor 1000 in section III.D - could refer to published data
• In "Safety and Engineering" include more detail, e.g. heat density and how one can cool easily - might take 3-4 pages for this section

• Figures in main text:

• CPS components
• Magnetic field and why
• Impact of plastic
• Neutron equivalent damage
• Prompt dose rates and boundary
• Activation doses

• Appendix 1 - concept transfer to Hall D

• Include figure of photon radiation with and without CPS
• Add bullet: to reduce power density in magnet could either reduce the magnetic field or use a double raster system as done for Hall A/C

• Optimization of material