eSTAR Upgrade Ming Shao USTC eRHIC the future of RHIC STAR Regional Meeting, Weihai, /24/2012 ToF: , K identification, t 0, electron ECal: electrons and photons GCT: a compact tracker with enhanced electron capability - Combine high-threshold (gas) Cherenkov with TPC(-like) tracking HCal: W powder, spaghetti calorimeter Simulations ahead eSTAR task force formed Evolving from STAR into eSTAR proton/nucleus electron ToF TPC i.s. GCT HCal GEM disks ECal 3STAR Regional Meeting, Weihai, 20127/24/2012 eRHIC phase 1: kinematic range Forward (-2.5 -1.4, pT resolution by TPC alone is good enough -> TRD may be coarse readout? STAR Regional Meeting, Weihai, 20127/24/2012 TRD hits resolution: X-Y 100 microns, Z 300 microns TRD Spatial Resolution Impact TRD hits resolution: X-Y 300 microns, Z 500 microns muons electrons 13STAR Regional Meeting, Weihai, 20127/24/2012 TRD hits per layer: 30 TRD Efficiency Impact muons electrons TRD hits per layer: 15 (50% efficiency) muonselectrons 14STAR Regional Meeting, Weihai, 20127/24/2012 TRD tracking with Stv First attempt succeeds with preliminary detector (TRD) response simulation StEtrFastSimMaker by Victor Stv track finding Along Z direction (along r direction in TPC) With Detector geometry and materials in (Kalman Filter) 15 ~ -1.2 p T = 1GeV/c 10 MC tracks Primary vertex loosely bounded Efficiency low (~30%) iTPC? p T resolution ~4% STAR Regional Meeting, Weihai, 20127/24/2012 GEM based TRD R&D work with Xe+CO 2 better position resolution by GEM better rate capacity / space charge Need R&D TRD readout structure thin/thick GEM? Multiple time bin readout TRD gain in Xe/CO 2 and uniformity GEM long time stability ALICE TRDReadout: MWPC -> GEM Multiple time bin readout Globe etching (micro etching) New type thick GEM 0.2mm 0.5mm 16STAR Regional Meeting, Weihai, 20127/24/2012 Simulation - Pythia in STARSIM Preliminary estimation of the acceptance of eSTAR detector system Pythia parameter setting follows EIC- MC guide, https://wiki.bnl.gov/e ic/index.php/PYTHIA, w/o radiative correction. https://wiki.bnl.gov/e ic/index.php/PYTHIA Stand-alone Pythia events for consistency check 17 Pythia version 6.4 STAR Regional Meeting, Weihai, 20127/24/2012 eSTAR acceptance 18 TRD #hit>0TPC #hit>0 && TOF #hit>0 STAR Regional Meeting, Weihai, 20127/24/2012 STAR Regional Meeting, Weihai, TPC acceptance (with iTPC upgrade) 7/24/2012 STAR Regional Meeting, Weihai, TPC acceptance (with iTPC upgrade) 7/24/2012 Summary ETTIE geometry implemented in STAR, TRD hits can be generated (in geant) and recorded (in StMcEvent and StEvent). TPC sector material budget has significant impact on track fitting (TPC+TRD), especially for inner sector part TRD spatial resolution change from 100 microns to 300 microns, or efficiency change to 50%, seem to have no significant impact on track fitting need further check with MCS and energy loss effects included Stv tracking with TRD hits is accomplished. Still need further improvement. Recoil electron (x,Q2) acceptance in ep GeV collisions in eSTAR system evaluated. 21STAR Regional Meeting, Weihai, 20127/24/2012 Kinematics in DIS at EIC 22STAR Regional Meeting, Weihai, 20127/24/2012 STAR Regional Meeting, Weihai, eRHIC phase-I 7/24/2012 eRHIC phase-II STAR Regional Meeting, Weihai, /24/2012 Some distributions 25STAR Regional Meeting, Weihai, 20127/24/2012 TR Simulation Check 26 More energy deposited near radiator TR changes energy deposition significantly Incident particle kinetic energy: 3GeV STAR Regional Meeting, Weihai, 20127/24/2012 Energy deposition at 1-5 GeV 27 electronpion Energy deposition increase with particle energy, according to relativistic dE/dx rise Energy deposition increase with particle energy within 1-3 GeV due to increase of TR photons, then saturate at 3-5 GeV STAR Regional Meeting, Weihai, 20127/24/2012 28 Tracking cut on energy deposition Tracking cut: exclude hits far away from the expected track trajectory Suppressing the tail of energy deposition (from eg. knock-on electrons or secondaries from hadron process) STAR Regional Meeting, Weihai, 20127/24/2012 Materials at TPC Endcap Change eta from to -1.23, avoiding the supporting Al rib pT resolution 2.9%pT resolution 4.4% STAR Regional Meeting, Weihai, 20127/24/2012