jin huang bnl. geant4 customary code phenix simulation/analysis eicroot by eic taskforce at bnl...
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RICH simulation tools survey
Jin HuangBNL
J. Huang <[email protected]> 2
GEANT4 customary code PHENIX simulation/analysis EICROOT by EIC taskforce at BNL (learning)
RICH Discussions
Three tools reviewed
J. Huang <[email protected]> 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
PHENIX Simulation/Analysis framework
J. Huang <[email protected]> 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
PHENIX Simulation/Analysis framework
J. Huang (LANL), K. Boyle (RBRC) 7DNP 2013
Full simulation of an EIC detectorAn event display for SIDIS @ x≈5×10-3 and Q2=10 (GeV/c)2
Integrated in PHENIX software framework
p, 250 GeV/c
e-, 10 GeV/cDIS e-
IP
TPC GEMs
EMCal
Gas RICH
Aerogel
DIRC
Babar coil
EM Calo.Hadron Calo.
EM Calo.
Hadron Calo.
BBC
arXiv:1402.1209
J. Huang (LANL), K. Boyle (RBRC) 8DNP 2013
Hadron PID Overview
Hadron PID Coverage
Detector coverage for hadron PID
IPp
e-
DIRC-1.2<η<+1
Gas RICH1<η<4
Aerogel RICH1<η<2
TPC GEMseGEM
RICHMirror
Aerogel RICH◦ Collaborate with gas RICH
to cover 1<η<2 Gas RICH: next slides
SIDIS x-Q2 coverage with hadron PID in two z-bins
J. Huang (LANL), K. Boyle (RBRC) 9
ePHENIX Gas RICH R
(cm
)
Z (cm)
RICH MirrorRICH Gas
Volume (CF4)
η=1
η=2
η=3
η=4EntranceWindow
Focal planeHBD detectorspherical
mirrorcenter
IP
High momentum hadron ID require gas Cherenkov◦ CF4 gas used, similar to LHCb 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
Beam test dataStonyBrook group
Purit
y
PID purity at η=4 (most challenging region w/ δp)
Courtesy: Stonybook groupFermilab T-1037 data
Ring size (A.U.)
J. Huang <[email protected]> 10
Some RICH event displayCourtesy: Nils Feege <[email protected]>
photon tracking in full event RICH Ring
RICH Discussions
J. Huang <[email protected]> 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
EIC ROOT, my glance
J. Huang <[email protected]> 15RICH Discussions
ePHENIX Magnet Concept
RICH
GEMStation4
EMCalHCal
GEMStation2
R (cm)HCal
p/AEMCal
GEMs
EMCal & Preshower
TPC
DIRC
η=+1
η= 4
-1.2
GEMStation3
GEMsStation1
η=-1
e-
Aerogel
z (cm) ZDCz≈12 m
Outgoinghadron
beam
Roman Potsz 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
J. Huang <[email protected]> 16RICH Discussions
Field effect - distortion for RICH 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
r
A RICH Ring:Photon distribution due to tracking bending only
R
DispersionΔR <2.5 mrad
R < 52 mrad for C4F10
RICH
EMCal
η~1
η~4
Aerogel
track