TL-DesignAndSim

Main Task List

Contact: Kent Paschke

Manpower: Kent Paschke, Adam Zec, Victoria Owen, Ciprian Gal

Radiation Benchmarking

• ERR recommendation
• Contact Dave Hamlette, Javier Gomez to discuss metrics for benchmark
• Tritium simulation geomtry, develop and benchmark. (Zec) <<March 28>>

Base design, v3 Benchmarks.

<<Complete by March 16>>

• Need new benchmarks (accounting for updated geometry (dump, HRS) and SAMS
  • for PREX-I, HAPPEX-II, PREX-2, CREX (and others?)
  • on HRS detectors, under HRS detectors, Hall Lid or Hall Wall total ("whole hall"), and Hall Lid skyshine estimates
• prex2-v3:
  • prex-2 dump, with shield
  • no SAMS, or alternative SAMs?
• crex2-v3:
  • (same with 48Ca target and 2.1 GeV)
• prex1-"v1.9"
  • PREX-I collimator
  • PREX-I chamber? (not as important)
  • PREX-I dump (with KW correction)
  • no HDPE, no SkyshineShield
  • Full size HRS det and structure, match prex2
  • FULL PREX-I SAMS
• HAPPEX-II - v1.9
  • HAPPEX-II collimator (same as PREX-I?)
  • PREX-I dump (with KW correction)
  • 3.2 GeV, 20cm LH2
  • PREX-I chamber (not as important)
  • no HDPE, no SkyshineShield
  • Full size HRS det and strucutre, match prex2 sim
  • FULL PREX-I SAMS
• PV-DIS?
• HAPPEX-3?
• TRITIUM (11 GeV)?

Geometry, Next iteration.

<<Complete by April 6>>.

• realistic gaps around dump shield
• target chamber
• collimator chamber to match design
• HDPE around target to match design
• modified SAM design?

Magnetic Shielding

• Evaluate B-field in Q1 beampipe with only one Q1 energized (Zec) <<April 1>>
• Evaluate the Tritium-Magnetic-shield design (Zec) << April 8>>
• Evaluate mag shield additions for upstream/downstream septum beampipe (Zec)

O-Ring damage

• Log results of 1/2 thickness ring vs. 1/2 of full ring volume
• resolve question of half-ring vs full ring
• Plots:
  • E-weighted, electron only plots from beamline det an o-ring det
  • tables to arrive at integrated grays
  • hall-lid det x0/y0 plot to show enhancement from full SAMS
• get info on O-ring from engineering. (material, lifetime expectations, also when did this appear?)
• Full base design (Feb18), but w/o dump shield
  • Use Al around O-ring
    • No SAMS
    • PREX-I SAMS
  • test 1/2 size O-ring (PREX) (PREX-I SAMS)
    • Done, but dumb results. Compare 1/2 size O-ring with 1/2 of full size O-ring.
  • test no material around O-ring (PREX) (PREX-I SAMS)
  • CREX
    • No SAMS
    • PREX-I SAMS
  • check beam-offset run
• Results for alternative SAM configs
• Final estimate use full base design (Feb18), including dump shield (contingent on final design)
  • PREX-2
  • CREX

SAM redesign

• calculate rates vs angle
• calculate doses vs angles
• get details on beer can, make default design including welding
• Attempt final design
• Propose/Exam alternative SBMs

Activation Estimation

• HDPE activation.
• Off-angle activation
• Install magnetic fields in FLUKA
• DUST ACTIVATION?
• Downstream septum beampipe flange, contact dose (DONE)
• Downstream septum beampipe flange, whole body dose (DONE)
• CREX activation estimates (DONE)

HDPE parameters

• Identify suitable borated HDPE material (price, density)
• Total / peak radiation dose. Damage? (DONE)
• spec non-flamable HDPE, or devise fireproofing (DONE - selected to enclose HDPE in Al box)

Thermal Neutrons:

• Log PREX-I results (zec)
• calculate thermal neutrons at Compton polarimeter (zec)
• count thermal/near thermal (<1eV rate), assume 8MeV / n energy release, compare to E&M power (DONE)
• plot sources of thermal neutrons in hall, using hall-lid and HRS-platform detectors (DONE)
• consider effect of 5% boron (DONE)

Polarimeter doses

• Evaluate dose and neutron rates (both thermal and above) at Moller and Compton locations
  • Moller target holder uses o-ring (evaluate dose)