The do RunII Detector Do Detector: Forward Mini-drift Central Scintillator Forward Scintilator Quarter r-z View: chambers ICD Shielding e SOLENOID (2n EC SVX New Solenoid, Tracking System Si, SciFi. Preshowers lectronics, Trig DAQ New for Run工: Retained from Run工: Magnetic Tracker: SMT, CFT, 2T Solenoid U/LAr Calorimeter Preshower Central Muon Detectors Forward Muon MI uon orol d Trigger DAQ
The DØ RunII Detector New for Run II: •Magnetic Tracker: SMT, CFT, 2T Solenoid •Preshower •Forward Muon •Trigger & DAQ Retained from Run I: •U/LAr Calorimeter •Central Muon Detectors •Muon Toroid
Vertex& Central Tracking 1. Silicon Microvertex Tracker: w 10um(design) 2. Central Fiber Tracker: scintillator fiber 10 calorimeter Major part of Run II upgrade Central Preshower Solenoid Forward 2T solenoid magnet shower 8 layer CFI L central Firecracker Silicon tracker Monitor Silicon Microvertex Tracker n=n(tg(6/2) Momentum resolution(design) =0.0150.0014p <l0% at 40 GeV
Vertex & Central Tracking 1. Silicon Microvertex Tracker : ~ 10 µm(design) 2. Central Fiber Tracker: scintillator fiber η=−ln(tg(θ/2))
The Calorimeter Liquid Argon sampling Stable, uniform response Ar purity Uranium absorber(Cu/Fe for coarse hadronic) dense absorber hence can be compact Compensated EM and hadronic response Linear response Hermetic with full coverage ynl<42(0≈29) Resolution o/E 15%/VE(Gev)"fine" EM 50%o/VE(GeV)"coarse"jet MET a+b S+C"S72 (run1 sum of et a~1.896eV b~6.7E ) C9.9E-6/GeV
The Calorimeter Z y x θ ϕ • Liquid Argon sampling 9 Stable, uniform response 9 LAr purity • Uranium absorber (Cu/Fe for coarse hadronic) 9 dense absorber hence can be compact 9 Compensated EM and hadronic response 9 Linear response • Hermetic with full coverage 9 |η| < 4.2 (θ ≈ 2o) Resolution: σ/E ~ 15%/√E(GeV) “fine” EM 50%/√E(GeV) “coarse” jet σMET ~ a + b*ST + c*ST2 (run1) ST scalar sum of ET a ~1.89GeV, b ~6.7E-3, c ~9.9E-6/GeV
Muon Detector DO: The muon detector Three muen layers: one inside () two outside (. () the toroid B z magnet (scintillators, drift tabes) seinuilalorx o Toprid The uon svstem is divided into INchi central forward regions each region is subdivided into( 8) Uc建 Calorimeter Two regions Three layers of Scintillator and Drift Tubes Invar. Mass Mu-Mu Central and Forward cN2d·1A(107 A Layer inside Toroid magnet J/Psi Pe来6oe p0·272:3 B &c layer outside Toroid magnet Local/Global 23+2131 Muon rapidity coverage to +2 02 Shielding reduces backgrounds by 50-100x Man·ca±oa: sm8:0 Coarse Local pT resolution Momentum rcsolution(dcsign): =0.1860.005 -40%o at 40 Gev u'u Invar. Mass(Gev)
Muon Detector • Two regions & Three layers of Scintillator and Drift Tubes – Central and Forward – A Layer inside Toroid magnet – B & C Layer outside Toroid magnet • Muon rapidity coverage to ±2 • Shielding reduces backgrounds by 50-100x • Coarse Local pT resolution J/Psi: Local/Global