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ALICE TRD

ALICE TRD. Transition Radiation Detector Overview and Status Clemens Adler Physikalisches Institut Heidelberg. Alice. TRD: Identification of electrons (p>1GeV) -0.9< η<0.9. Small size Prototype measurement. Operation principle. Xe/CO 2. 540 individual drift chambers

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ALICE TRD

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  1. ALICE TRD Transition Radiation Detector Overview and Status Clemens Adler Physikalisches Institut Heidelberg Clemens Adler PI Heidelberg

  2. Alice TRD: Identification of electrons (p>1GeV) -0.9<η<0.9 Clemens Adler PI Heidelberg

  3. Small size Prototype measurement Operation principle Xe/CO2 Clemens Adler PI Heidelberg

  4. 540 individual drift chambers 750 m² active area 6 radial layers 18 phi sectors (“Supermodules”) Full phi coverage |eta|<0.9 1.16 million electronics channels Some numbers Clemens Adler PI Heidelberg

  5. Pion rejection (90% electron efficiency) Position resolution Performance Clemens Adler PI Heidelberg

  6. Fast simulation T. Mahmoud: Phd Thesis Heidelberg 2004 Quarkonia: J/Ψ, Y -> important probe of QGP TRD Trigger: Triggering on High Pt Electrons (t~6μs) Input rate: few kHz Output rate: <200 Hz Physics application Clemens Adler PI Heidelberg

  7. Challenges: large area (1-1,7m²) low material budget (15% X0) high rigidity: ->Composite materials (e.g. ROPanel: FACC, Austria) Large number of chambers: Many production sites: Dubna GSI Bucharest Frankfurt Heidelberg Readout Chambers Clemens Adler PI Heidelberg

  8. Lot of know how from Dubna (Hades experience) went into Chamber building procedures Important contribution to problem solving Very good communication Chamber production in Dubna CERN DG visit to Dubna Clemens Adler PI Heidelberg

  9. X-ray test stand: To test gain uniformity of the ROCs Joint development of Dubna (mechanical engineering) and Heidelberg (Controls) Supermodule cosmic ray test stand in development at Dubna Testing, QA Clemens Adler PI Heidelberg

  10. Chamber production started last year. Heidelberg since 11/03 Dubna since 4/04 Bucharest since 10/04 GSI since 10/04 Frankfurt (summer 2005) 30 ROCs produced 1st Supermodule to be assembled in Summer Production Status Clemens Adler PI Heidelberg

  11. ‚Supermodules‘ development: Joint effort of Dubna and Heidelberg TRD in the ALICE Space frame Clemens Adler PI Heidelberg

  12. Low power custom designed chips 4104 ROB x 17 MCM (Multi Chip Modules) MCM: Analog PASA ADC TRAcklet Processor (TRAP): Tracklet reconstruction in real time Status: Final iterations on ROB design to minimize noise TRAP+ADC Chip last iteration PASA full quantity in house. Electronics Clemens Adler PI Heidelberg

  13. Testbeam with 6 Chamber Stack CERN, Oct. 2004 Testbeam 2004 Clemens Adler PI Heidelberg

  14. Data analysis ongoing: Heidelberg Frankfurt GSI Dubna (B. Batyunia and S. Zaporozec) Final Electronics were working stable Chambers: Online plot: Testbeam performance Clemens Adler PI Heidelberg

  15. Dubna Contributions • Readout Chambers • Supermodule design • Cosmic ray test stand • X-ray test stand • Software development, Simulation, Data analysis Clemens Adler PI Heidelberg

  16. Future Dubna TRD Activity • Test beams: GSI June 2005 • Chamber production (108 pc.): until End 2006 • Software: • Simulation • Test beam data analysis • Analysis software development • Commissioning: • Cosmic ray test stand (Chamber alignment) • Supermodule assembly/testing • Supermodule installation at CERN starting 2006 Clemens Adler PI Heidelberg

  17. Collaboration Main Contributions: Germany: • Frankfurt University (IKF) • Gesellschaft für Schwerionenforschung (GSI) Darmstadt • Heidelberg University (Physikalisches Institut, Kirchhoff Institut) • Münster University (IKP) Russia: • JINR Dubna (Y.Zanevsky, Y.Panebratsev groups, S. Vodopianov) Romania: • NIPNE Bukarest (group of M.Petrovici) Additional Subsystems: Japan: Tokyo University, Nagasaki University Greece: Athens University Germany: FH Köln, University Kaiserslautern, FH Worms, TU Darmstadt Clemens Adler PI Heidelberg

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