11-3-2004 Christian Lippmann (ALICE TRD), DPG-Tagung Köln Position Resolution, Electron Identification and Transition Radiation Spectra with Prototypes.

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Presentation transcript:

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Position Resolution, Electron Identification and Transition Radiation Spectra with Prototypes of the ALICE TRD Christian Lippmann for the ALICE TRD Collaboration

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Outline The ALICE TRD Requirements Working Principle Test Beam Setup Results Summary and Outlook

Christian Lippmann (ALICE TRD), DPG-Tagung Köln The ALICE Experiment ITS Low p t tracking Vertexing ITS Low p t tracking Vertexing TPC Tracking, dEdx TPC Tracking, dEdx TRD Electron ID TRD Electron ID TOF PID TOF PID HMPID PID high p t HMPID PID high p t PHOS ,  0 PHOS ,  0 MUON  -pairs MUON  -pairs PMD  multiplicity PMD  multiplicity

Christian Lippmann (ALICE TRD), DPG-Tagung Köln The TRD (Transition Radiation Detector) 18 supermodules 6 radial layers 5 longitudinal stacks  540 chambers  750m 2 active area  28m 3 of gas Each chamber: ≈ 1.45 x 1.20m 2 ≈ 12cm thick (incl. Radiators and electronics) in total 1.18 million read out channels

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Requirements The TRD should: Provide electron identification. Increase the tracking capability of the experiment. Provide trigger on high-p t electrons. Pion rejection factor ≈ 100 required Angular resolution σ α < 1° required Position Resolution σ x < 400μm required – Same Requirements

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Working Principle of the TRD Drift chambers with FADC readout at 10MHz combined with a fiber/ foam sandwich radiator in front. Transition Radiation (TR) photons (< 30keV, only for electrons) are absorbed by high-Z gas mixture (Xe,Co 2 )  large clusters

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Testbeam Setup 1: Testbeam at CERN PS in October 2002 Momenta up to 4GeV/c S1, S2: Scintillators as trigger Cherenkov: Electron tagging Si1: Track position Dipole Magnet: Separate TR He pipe: Minimize TR absorption

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Results 1: TR Spectra [O.Busch, TRDs for the 3rd Millenium, Bari'03] We have a quantitative understanding of TR production and absorption.

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Testbeam Setup 2: Testbeam at CERN PS in October 2002 Momenta up to 6GeV/c Added a calorimeter for better electron tagging Stack of 4 small TRD prototypes Si1, Si2 for position reference

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Results 2: Average Signals Pulse height vs. time bin for pions, electrons only dE/dx, electrons dE/dx+TR. We find for electrons: larger dE/dx. characteristic TR energy deposit on top. Use differing energy deposit and TR signature to identify electrons!

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Results 3: Pion Efficiency The pion rejection has to be large to minimise number of pions misidentified as electrons. The pion efficiency is the inverse of this value and has to be minimized. Different radiator types were tested. L QX = bidimensional likelihood. Uses: deposited charge (dE/dx+TR) position of largest cluster We reach a rejection factor 100 Can be increased by Neural Network (Poster HK12.42)

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Results 4: Space Charge Effect (SCE) We expect a space charge effect for perpendicular tracks from pileup of ions around same wire spot for given track. Can influence pion rejection! Simulation with SCE: Ratio of Pulse Heights at 0° and 15° and comparison to simulations. Simulation without SCE: Pion rejection performance as function of angle should be constant gain [A.Andronic et al., NIM A in press]

Christian Lippmann (ALICE TRD), DPG-Tagung Köln The pulse height is sampled at 10MHz on eight pads. For each time bin the position along the pad rows is reconstructed. A straight line fit leads to the incident particles track. Residuals define Position Resolution Tracking: Example Event

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Results 5: Position Resolution Position Resolution = Sigma of Gauss-fit to Residuals Histogram Here vs. signal-to-noise Example at 15° Larger Signals  better resolution σ x = µm When a radiator is used, the resolution is worse for electrons  Bremsstrahlung Nice agreement with simulation!

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Results 6: Position Resolution vs. Angle Nominal gain (4000) Requirement met: σ x  400µm Resolution for electrons better due to larger S/N Nice agreement with simulation

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Results 7: Angular Resolution vs. Angle Requirement met: σ  < 1° For electrons the agreement is not so good  more investigations

Christian Lippmann (ALICE TRD), DPG-Tagung Köln Summary and Outlook We have tested prototypes of ALICE TRD chambers. The requirements are met. We reach: –a position resolution of σ x = µm, –an angular resolution of σ α = ° and –a pion rejection factor of 100. Different systematic effects (Space charge effect, …) are well understood. We have measured pure TR spectra for our specific Radiators. Outlook: –Mass production starts (see talk HK45.9). –Testbeam with stack of 6 final fullsize TRD chambers in october at CERN.