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Task List, Preparing for 2019 Run

Task Name Owner Last Deadline Wikipage
Design and Simulation Kent Paschke Dec 2018 wikipageLink

Radiation Benchmarking

  • ERR recommendation
  • Contact Dave Hamlette, Javier Gomez to discuss metrics for benchmark

Design and Simulation

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-"??name??"
    • 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
  • HAPPEX-II - ??name??
    • 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
  • PV-DIS?
  • HAPPEX-3?
  • TRITIUM (11 GeV)?
  • DVCS?

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
  • Evaluate the Tritium-Magnetic-shield design
  • Evaluate mag shield additions for upstream/downstream septum beampipe

O-Ring damage

  • 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
    • 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

  • Downstream septum beampipe flange, contact dose
  • Downstream septum beampipe flange, whole body dose
  • CREX activation estimates
  • HDPE activation.

HDPE parameters

  • Total / peak radiation dose. Damage?
  • spec non-flamable HDPE, or devise fireproofing

Thermal Neutrons:

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

Polarimeter doses

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

Spectrometer Optics Design

  • FOM optimization
  • Q1 collimator cut-out

Analysis Chain

  • First attempt at new analyzer <<June deadline>>
  • Test on PREX1 data.
    • (Re)Create plots that were used to verify PREX1 data integrity/quality
    • Add analysis and drawing macros to analyzer package
  • Create fake PREX2/CREX data with updated names and addresses for BCMs, BPMs.
  • Use macros to create online monitoring GUIs
    • Add warning messages for online monitoring for shift crew

DAQ / Slow Controls

  • Multicrate running.
  • Sync monitor.
  • Test fast event transfer to online monitor/feedback at 240 Hz
  • ADC maintenance - number of channels, etc
  • BCM, digital cavity receivers - verify functioning
  • Select which BPMs should be in the data stream. very proper functioning at 240 Hz
  • slow controls

Beam Modulation System

  • Testing of installed hardware
  • Evaluation of accelerator interface software
  • Coordination with other halls, scheduling committee
  • Beam modulation software (Hall)
    • modulation process
    • slow control / monitoring
    • DAQ interface

Detector Stack


Integrating Detectors

  • Complete Design
  • Linearity Studies
  • Plan for Blind tubes in spectrometer hut?

Detector Mounting Hardware

Polarized Source / Injector

  • RTP / KD*P?
  • Test setting limits on spot size
  • Outline configuration procedure and run-planning
  • spin-flipper studies

Moller Polarimeter

  • 1 GeV Optics
  • simulation for acceptance evaluation
  • target system installation
  • Plan to establish high-precision Moller polarimetry (ERR recommendation)

Compton Polarimeter

  • Plan to establish high-precision Compton polarimetry (ERR recommendation)
  • Laser Maintenance and improvement, summer 2018
  • e- detector, final plan


Run planning

  • Plan for beam alignment (collimator, dump) and raster commissioning (ERR recommendation)
  • Comprehensive List / Planning for survey and alignment tasks
  • Watercell (pointing) runplan
  • optics runplan
  • detector alignment run plan


  • Finalize OSPs (ERR recommendation)