jinr-bmbf workshop, dubna 18.01.2005clemens adler pi heidelberg alice trd transition radiation...
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JINR-BMBF Workshop, Dubna 18.01.2005 Clemens Adler PI Heidelberg
ALICE TRD
Transition Radiation Detector Overview and Status
Clemens AdlerPhysikalisches Institut Heidelberg
JINR-BMBF Workshop, Dubna 18.01.2005 Clemens Adler PI Heidelberg
Alice
TRD:Identification of electrons (p>1GeV) -0.9<η<0.9
JINR-BMBF Workshop, Dubna 18.01.2005 Clemens Adler PI Heidelberg
Operation principle
Small size Prototype measurement
Xe/CO2
JINR-BMBF Workshop, Dubna 18.01.2005 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|<0.9• 1.16 million
electronics channels
JINR-BMBF Workshop, Dubna 18.01.2005 Clemens Adler PI Heidelberg
Performance
• Pion rejection (90% electron efficiency)
• Position resolution
JINR-BMBF Workshop, Dubna 18.01.2005 Clemens Adler PI Heidelberg
Physics application
Fast simulationT. 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 18.01.2005 Clemens Adler PI Heidelberg
Readout Chambers
• 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
JINR-BMBF Workshop, Dubna 18.01.2005 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 18.01.2005 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 18.01.2005 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 18.01.2005 Clemens Adler PI Heidelberg
TRD in the ALICE Space frame
• ‚Supermodules‘ development: Joint effort of Dubna and Heidelberg
JINR-BMBF Workshop, Dubna 18.01.2005 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 18.01.2005 Clemens Adler PI Heidelberg
Testbeam 2004
• Testbeam with 6 Chamber Stack CERN, Oct. 2004
JINR-BMBF Workshop, Dubna 18.01.2005 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 18.01.2005 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 18.01.2005 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 18.01.2005 Clemens Adler PI Heidelberg
CollaborationMain 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 UniversityGreece: Athens University Germany: FH Köln, University Kaiserslautern, FH Worms, TU Darmstadt