RICH simulation tools survey

Jin HuangBNL

J. Huang <jhuang@bnl.gov> 2

GEANT4 customary code PHENIX simulation/analysis EICROOT by EIC taskforce at BNL (learning)

RICH Discussions

Three tools reviewed

J. Huang <jhuang@bnl.gov> 3

Directly work with GEANT4

RICH Discussions

J. Huang <jhuang@bnl.gov> 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 <jhuang@bnl.gov> 5

PHENIX Simulation/Analysis framework

RICH Discussions

J. Huang <jhuang@bnl.gov> 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 <jhuang@bnl.gov> 10

Some RICH event displayCourtesy: Nils Feege <nils.feege@stonybrook.edu>

photon tracking in full event RICH Ring

RICH Discussions

J. Huang <jhuang@bnl.gov> 11

EIC ROOT

RICH Discussions

J. Huang <jhuang@bnl.gov> 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 <jhuang@bnl.gov> 13RICH Discussions

Event displayCourtesy: BNL EIC Taskforce

J. Huang <jhuang@bnl.gov> 14

Backup

RICH Discussions

J. Huang <jhuang@bnl.gov> 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 <jhuang@bnl.gov> 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