Beam Simulations
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Revision as of 19:26, 18 June 2018 by Jonesrt (Talk | contribs) (→PS+TPOL simulations with 75 micron converter)
PS+TPOL simulations with 75 micron converter
- 75um beryllium converter
- photon beam energy 8.0 - 8.8 GeV.
- 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:
- A vs photon energy
- A vs photon displacement at converter
- 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: ~2 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): 11,998,800,000
- TPOL+PS coincidences recorded: 553,000
- root://nod25.phys.uconn.edu/Gluex/beamline/pairsim/5-2018/tpolskim_75um.hddm
PS+TPOL simulations with 750 micron converter
- 750um beryllium converter
- photon beam energy 8.0 - 8.8 GeV.
- 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:
- A vs photon energy
- A vs photon displacement at converter
- 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: ~2 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): 11,429,400,000
- TPOL+PS coincidences recorded: (yet to come)
- root://nod25.phys.uconn.edu/Gluex/beamline/pairsim/5-2018/tpolskim_750um.hddm