JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg ALICE TRD Transition Radiation Detector Overview and Status Clemens Adler Physikalisches Institut Heidelberg

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Alice TRD: Identification of electrons (p>1GeV) -0.9<η<0.9

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Operation principle Small size Prototype measurement Xe/CO 2

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Some numbers 540 individual drift chambers 750 m² active area 6 radial layers 18 phi sectors (“Supermodules”) Full phi coverage |eta|< million electronics channels

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Performance Pion rejection (90% electron efficiency) Position resolution

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Physics application 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

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Readout Chambers Challenges: –large area (1-1,7m²) –low material budget (15% X 0 ) –high rigidity: ->Composite materials (e.g. ROPanel: FACC, Austria) Large number of chambers: –Many production sites: Dubna GSI Bucharest Frankfurt Heidelberg

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

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

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Production Status 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

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg TRD in the ALICE Space frame ‚Supermodules‘ development: Joint effort of Dubna and Heidelberg

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Electronics 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.

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Testbeam 2004 Testbeam with 6 Chamber Stack CERN, Oct. 2004

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

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg Dubna Contributions Readout Chambers Supermodule design Cosmic ray test stand X-ray test stand Software development, Simulation, Data analysis

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg 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

JINR-BMBF Workshop, Dubna Clemens Adler PI Heidelberg 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