Jin Huang BNL

 GEANT4 customary code  PHENIX simulation/analysis  EICROOT by EIC taskforce at BNL (learning) RICH Discussions J. Huang 2

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 Basis: ◦ Based on Geant4 and ROOT for TTree output ◦ Run a separate ROOT macro for analysis  Event generator: ◦ Single particle ◦ Need external G4 simulation for full event simulation  Analysis: ◦ ROOT based analysis  Portability: ◦ Everywhere that run GEANT and ROOT ◦ Lack of code basis (e.g. digitalization) ◦ Need some work to join future project (out of our scope)  I like this strategy for single detector R&D projects ◦ Example to start: G4/example/advanced/Rich (LHCb RICH) ◦ Running this way for SoLID calorimeter tuning ◦ Hubert’s study RICH Discussions J. Huang 4

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 Basis: ◦ Based on Geant4 and phenix analysis software ◦ Integrate geometry definition and subsystem construction ◦ Run GEANT4/analysis in one or separated root session(s)  Event generator: ◦ Single particle/pythia/HepMC file  Analysis: ◦ ROOT based analysis/PHENIX software base  Portability: ◦ NONE. Can only run on PHENIX central computing environment  Not recommended for this project ◦ But may borrow some useful bits RICH Discussions J. Huang 6

DNP 2013 J. Huang (LANL), K. Boyle (RBRC)7 p, 250 GeV/c e -, 10 GeV/c DIS e - IP arXiv:

DNP 2013 J. Huang (LANL), K. Boyle (RBRC)8 Hadron PID Coverage Detector coverage for hadron PID IP p p e-e- e-e- DIRC -1.2 <η<+1 DIRC -1.2 <η<+1 Gas RICH 1 <η<4 Gas RICH 1 <η<4 Aerogel RICH 1 <η<2 Aerogel RICH 1 <η<2  Aerogel RICH ◦ Collaborate with gas RICH to cover 1 <η<2  Gas RICH: next slides SIDIS x-Q 2 coverage with hadron PID in two z-bins

R (cm) Z (cm) RICH Mirror RICH Gas Volume (CF 4 ) η=1 η=2 η=3 η=4 Entrance Window Focal plane HBD detector spherical mirror center IP  High momentum hadron ID require gas Cherenkov ◦ CF 4 gas used, similar to LHC b RICH  Beautiful optics using spherical mirrors  Photon detection using CsI−coated GEM in hadron blind mode  Magnetic field line most along track within the RICH volume → minor ring smearing due to track bending  Active R&D: recent beam test by the stony brook group DNP 2013 J. Huang (LANL), K. Boyle (RBRC)9 Beam test data StonyBrook group Purity PID purity at η=4 (most challenging region w/ δp) Courtesy: Stonybook group Fermilab T-1037 data Ring size (A.U.)

photon tracking in full event RICH Ring RICH Discussions J. Huang 10

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 Basis: ◦ Based on FairRoot which drive several simulation model (GEANT3/4, fluka) through ROOT  Event generator: ◦ Single particle, Pythia (and many other EIC generators)  Analysis: ◦ ROOT based analysis/ FairRoot software base (e.g. Kalman filter)  Portability: ◦ Get the code: RICH Discussions J. Huang 12

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RICH Discussions J. Huang 15 RICH GEM Station4 EMCal HCal GEM Station2 R (cm) HCal p/A EMCal GEMs EMCal & Preshower TPC DIRC η=+1 η= GEM Station3 GEMs Station1 η=-1 e-e- e-e- Aerogel z (cm) ZDC z≈12 m Outgoing hadron beam Roman Pots z ≫ 10 m R (cm) z ≤ 4.5m BBC BaBar Coil  Based on BaBar Coil, central field = 1.5T  Field Return ◦ Central and forward hadron calorimeters (iron plate-scint. sampling) ◦ Lampshade Yoke ◦ End cap yoke for e-going direction  Detectors that use/sensitive to field ◦ Tracking: TPC for central η, GEMs for forward directions ◦ Gas RICH detector, field effect is small

RICH Discussions J. Huang 16  Field calculated numerically with field return  Field lines mostly parallel to tracks in the RICH volume with the yoke  We can estimate the effect through field simulations A RICH Ring: Photon distribution due to tracking bending only R Dispersion ΔR <2.5 mrad Dispersion ΔR <2.5 mrad R < 52 mrad for C 4 F 10 RICH EMCal η~1 η~4 Aerogel track