1. Jin Huang BNL

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

3. RICH Discussions J. Huang 3

4.  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

5. RICH Discussions J. Huang 5

6.  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

7. DNP 2013 J. Huang (LANL), K. Boyle (RBRC)7 p, 250 GeV/c e -, 10 GeV/c DIS e - IP arXiv:1402.1209

8. 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

9. 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.)

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

11. RICH Discussions J. Huang 11

12.  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: http://svn.racf.bnl.gov/svn/eic/eicroot/trunk/INSTALL RICH Discussions J. Huang 12

13. RICH Discussions J. Huang 13

14. RICH Discussions J. Huang 14

15. 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= 4 -1.2 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

16. 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