Beam Simulations

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Hsect 75 1e9 2016.png

PS+TPOL simulations with 75 micron converter (2016)

  • simulated run 11484
  • 75um beryllium converter
  • photon beam energy 8.2 - 9.0 GeV.
  • context="variation=mc calibtime=2018-05-21"
  • coherent bremsstrahlung spectrum, edge at 9.0 GeV.
  • GlueX beamline geometry, 3.4mm collimator, 60um diamond radiator.
  • 12.0 GeV electron beam @ 50 nA, 5e-8 m.rad emittance, 0.5mm virtual spot r.m.s.
  • 100% PERP polarization on every beam photon, otherwise GlueX beam properties.
  • tagger simulation with randoms included over interval [-10, +10]ns.
  • background photons included from 1 MeV to endpoint energy.
  • sufficient statistics to cut on variables to study systematics:
    1. A vs photon energy
    2. A vs photon displacement at converter
    3. A vs pair energy asymmetry, PS edge effects
  • rough estimate of statistics:
    • total events generated: 10,000 M
    • total events with PS trigger: 2,000 M
    • total PS triggers with in-time TPOL hits: 6 M
    • total events passing TPOL analysis cuts: ~3 M
  • resource estimate: 100khr running on OSG, final sample size ~2 GB
  • expected uncertainty on extracted A: 0.1% abs., 0.5% rel.
  • final generated statistics:
    • events generated (pairs + triplets): 20,828,100,000
    • TPOL+PS coincidences recorded: 6,668,155
  • root://nod25.phys.uconn.edu/Gluex/beamline/pairsim/5-2018/tpolskim_75um_2016.hddm
Hsect 75 1e9.png

PS+TPOL simulations with 75 micron converter (2017-2018)

  • simulated run 42136
  • 75um beryllium converter
  • photon beam energy 8.0 - 8.8 GeV.
  • context="variation=mc calibtime=2018-05-21"
  • coherent bremsstrahlung spectrum, edge at 8.8 GeV.
  • GlueX beamline geometry, 5mm collimator, 60um diamond radiator.
  • 11.6 GeV electron beam @ 150 nA, 5e-8 m.rad emittance, 0.5mm virtual spot r.m.s.
  • 100% PERP polarization on every beam photon, otherwise GlueX beam properties.
  • tagger simulation with randoms included over interval [-10, +10]ns.
  • background photons included from 1 MeV to endpoint energy.
  • sufficient statistics to cut on variables to study systematics:
    1. A vs photon energy
    2. A vs photon displacement at converter
    3. A vs pair energy asymmetry, PS edge effects
  • rough estimate of statistics:
    • total events generated: 10,000 M
    • total events with PS trigger: 3,100 M
    • total PS triggers with in-time TPOL hits: 12 M
    • total events passing TPOL analysis cuts: ~5 M
  • resource estimate: 100khr running on OSG, final sample size ~2.2GB
  • expected uncertainty on extracted A: 0.1% abs., 0.5% rel.
  • final generated statistics:
    • events generated (pairs + triplets): 15,017,600,000
    • TPOL+PS coincidences recorded: 6,949,740
  • root://nod25.phys.uconn.edu/Gluex/beamline/pairsim/5-2018/tpolskim_75um_6-26-2018.hddm
Hsect 750 1e9.png

PS+TPOL simulations with 750 micron converter (2017-2018)

  • simulated run 42553
  • 750um beryllium converter
  • photon beam energy 8.0 - 8.8 GeV.
  • context="variation=mc calibtime=2018-05-21"
  • coherent bremsstrahlung spectrum, edge at 8.8 GeV.
  • GlueX beamline geometry, 5mm collimator, 60um diamond radiator.
  • 11.6 GeV electron beam @ 150 nA, 5e-8 m.rad emittance, 0.5mm virtual spot r.m.s.
  • 100% PERP polarization on every beam photon, otherwise GlueX beam properties.
  • tagger simulation with randoms included over interval [-10, +10]ns.
  • background photons included from 1 MeV to endpoint energy.
  • sufficient statistics to cut on variables to study systematics:
    1. A vs photon energy
    2. A vs photon displacement at converter
    3. A vs pair energy asymmetry, PS edge effects
  • rough estimate of statistics:
    • total events generated: 10,000 M
    • total events with PS trigger: 3,100 M
    • total PS triggers with in-time TPOL hits: 20 M
    • total events passing TPOL analysis cuts: ~5 M
  • resource estimate: 100khr running on OSG, final sample size ~2.6GB
  • expected uncertainty on extracted A: 0.1% abs., 1% rel.
  • final generated statistics:
    • events generated (pairs + triplets): 12,429,600,000
    • TPOL+PS coincidences recorded: 7,315,373
  • root://nod25.phys.uconn.edu/Gluex/beamline/pairsim/5-2018/tpolskim_750um_6-26-2018.hddm



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