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Detector Designs for eRHIC

Detector Designs for eRHIC. Renee Fatemi Massachusetts Institute of Technology October 24, 2004. In case you missed it… eRHIC will provide:. Longitudinal/Transversely Polarized electron beam (5-10 GeV) Possibility for polarized positron beam (10 GeV)

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Detector Designs for eRHIC

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  1. Detector Designs for eRHIC Renee Fatemi Massachusetts Institute of Technology October 24, 2004

  2. In case you missed it… eRHIC will provide: • Longitudinal/Transversely Polarized electron beam (5-10 GeV) • Possibility for polarized positron beam (10 GeV) • Longitudinal/Transversely Polarized Proton beam (50-250 GeV) • Light and Heavy nuclei species beams and possibility for He3! (100 GeV/nuclei) • Variable cm energies = 30-100 GeV • e-p Luminosities ~1032-1034 cm-2s-1 • e-A Luminosities ~ 1030-1032 cm-2s-1 • Access to Q2=0-104 GeV2 + 0.7 > x > 10-4 PANIC05

  3. Polarized DIS Program Need broad kinematic reach in xand Q2 PANIC05

  4. Unpolarized e-p/A First possibility for e+ion collider PANIC05

  5. Detector Requirements • Precisely measure e' for large Q2 and xrange • Hadronic final state (jets+meson PID) • Missing Energy  Hermetic Design • 0°  detector  radiative corrections • Tagging of forward particles • Proton remnant tagger • Zero Degree Neutron Detector • Incorporate all of this into 1 DETECTOR? Talk about 2 Designs! Simulated ep DIS event (LEPTO) e jet PANIC05

  6. Scattering Event Topology BARREL FORWARD REAR Region I: • Q2 < 1,x > 0.01 • electron rear • proton forward Region II: • Q2 < 1, x < 0.01 • electron rear • proton rear Region III: • Q2 > 1 • electron barrel • proton barrel PANIC05

  7. B. Surrow J. Pasukonis Design I: MIT ELECTRon-A A general purpose polarized/unpolarized detector STARTING point… • Hermetic Detector inside +/-3m of machine element free region • Barrel and Rear Si-Tungsten EM Calorimeter • Forward Pb-Scintillator EM/hadron Calorimeter • Inner Tracker - high precision Si detector • Outer Tracker - Triple GEM/micro-pattern technology (35ns Xing!) • Barrel Calorimeter and tracking in Solenoid Magnetic Field ~4.2 m PANIC05

  8. B. Surrow J. Pasukonis ELECTRon-ADesign/Simulation Status: • GEANT simulation of central detector (tracking + calorimetry) available • Calorimeter cluster and track reconstruction implemented • Code available at: http://starmac.lns.mit.edu/~erhic/electra/ • Next Tasks: • Evaluate and optimize detector configuration • Design forward tagging systems • Incorporate PID detectors for exclusive processes • Optimize forward detector for high-multiplicity eA environment =0.5 =0.0 PANIC05

  9. B. Surrow J. Pasukonis ELECTRon-ADetector Response: Simulated ep DIS event (LEPTO) Simulated eCa event (VNI) Top view Need to address high forward multiplicity in ion collisions LEPTO && DJANGO DIS generators implemented PANIC05

  10. Possible “CDF/CLEO set-up” for R2D / eRHIC (very preliminary, needs a lot of simulation and R&D to optimize and select) 0. 200. Hadron Calorimeter / Muon Detector Z EMC, CsI crystal, ~8 X0 R 300. EMC; Fe+Sc SC Coil; R = 1.5 m; Bz = 1.5 T AeroGel2 Ch. D. 150. RICH AeroGel1 Ch. D. A, p, e- GEM Tracking D. A, p Barrel Tracking and PiD Variant A: Two TPC+Ch.D. systems. Pad Detectors with CsI (UV converter) in the same gas volume to use TPC “working” gas as UV radiator. First; C4H10 (C2H6) ? Second: CF4 Maximum drift time ~10 μs TPC readout: GEMs+pads + MicroPattern Gas Detectors Variant B: 5-6 layers of Si strip Detectors + MicroPattern Gas Detectors + RICH gas Detector RICH / TRD. EMC; Fe+Sc Si Vertex D. EMC, CsI crystal, ~16 X0 End Cap Tracking and PiD Si + MicroPattern Gas Detectors + RICH gas Detector ( or TRD in “e-side” , eRHIC)

  11. Abt, Caldwell, Liu, Sutiak MPP-2004-90, hep-ex 0407053 Design II:MPI-Munich group Forward unpolarized ep + eA physics • Central Si-Tungsten EM calorimetry inside a magnetic dipole field plus hadronic and EMC calorimetric end-walls. • Field focuses charged particles into detector volume - extending rapidity compared to existing detectors • Tracking focuses on forward and backwards tracks. • No tracking in central region • Requires 5m machine free region • Forward hadron calorimeter follows existing ZEUS design PANIC05

  12. MPI-Munich Calorimeter/tracking Detail • 14 Si-strip tracking stations • pT/pT ~2% resolution • Assumed hit resolution 20 m • Forward coverage to =6 over full energy range PANIC05

  13. Abt, Caldwell, Liu, Sutiak MPP-2004-90, hep-ex 0407053 MPI-MunichKinematic coverage  X  tracking coverage for e+ • Full tracking for || > 0.75 • No acceptance for central || < 0.5 • Full W range down to Q=0.01 GeV2! • Hole in Q2 for E >100 GeV could be “filled” in with mid-rapidity calorimetry For Ee < 6 GeV full acceptance for 0.5<<8 PANIC05

  14. Status and Conclusions • eRHIC provides a necessary facility for many of the most pressing QCD related physics questions • Zeroth Order Design Report Submitted and Reviewed at BNL • Highly Developed Forward Detector focused on very low/high x for unpolarized and CGC studies • Design of mutli-purpose central detector, focused on inclusive measurements, has started • May want to install detectors separately in two different IR’s or have staged installation in single hall. • For more information see Bernd Surrow’s talk Sunday Oct. 30th New Frontiers at RHIC PANIC05

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