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Fast TRD - R&D Status
Mihai Petrovici, CBM-Meeting, Feb. 26-29, 2008, GSI
• Introduction• Short review - First HCRTRD prototypes: - MWPC – w & w/o drift zone - GEM - Second HCRTRD prototypes - MWPC – double sided - GEM Counting rate performance: • charge • pulse height • position resolution • e/ discrimination
• Third HCRTRD prototype – real size cell
• Conclusions
BC
M
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Baseline Detector SetupTracking: STS, TRD
Vertexing: STS
Hadron ID : TOF
Electron ID: RICH, TRD, ECAL
γ, n: ECAL
The Challenge:
• very rare probes in Au+Au at reaction rates up to 107events/sec
• ~ 1000 charged particle/event
CBM - TRD Counting rates ~ 105 part/sec/cm2
High granularity- rej (at 90% e efficiency) > 100
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First HCRTRD - prototype
-type: radiator + MWPC
-anode-cathode distance–3 mm-2.5 mm anode pitch
- maximum drift time ~ 100 ns
- channel size ~ 6 cm2
1 GeV/c
UA = 1900 V
Xe,CO2 (15%)
Rohacell
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ALICE-TRD
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Readout electrode
pad size: 5 x 10 mm2
Anode
20 μm , WAu
2.5 mm pitch
Second HCRTRD - prototype
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High Counting Rate EffectXe,CO2(15%), p-1.5 GeV/c
1.2 % 6.1 %- 5.1 % 4.3 %
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Rate Dependence for 300 Tilted Chamber
2.5 % 1.2 %3.4 % 1.2 %
1.2 % 1.2 % 1.2 % 1.2 %
1800 V
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Rate Dependence of the Position Resolution
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log(pe/p ) pe/(pe + p )
20/500/120 20/500/120
1800 V, foils, ~ 0.7 % rejection
20/500/120 20/200/220, 1.4 better
e/ discrimination performance 1.5 GeV/c
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e/ discrimination performance
1 GeV/c,UA = 1900 V
1.5 GeV/c,UA = 1800 V
1.5 GeV/c,UA = 1800 V
Xe,CO2(15%)
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e/ discrimination performance ALICE - TRD
Taku Gunji – ALICE TRD
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e
e/ discrimination – counting rate dependence
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•TRD based on compact geometry MWPC works up to > 2•105 particles/cm2/sec with negligible change of pulse height or charge (~2-3%)
•The position resolution at low rate is ~160 m; the observed degradation is ~20 m at 2•105 particles/cm2/sec ;
•A double-sided pad readout electrode brings the performance of these TRD at a rejection factor of ~200 for 6 layers using appropriate foil stack radiator.
The solution for: -high counting rate- high granularity- high e/ rejection factor - minimum material budget- minimum electronic channels
Conclusions
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Third HCRTRD - prototype
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Participants
NIPNE-Bucharest University of Münster D. Bartos M. Petris M. Hoppe I. Berceanu M. Petrovici A. Wilk V. Catanescu V. Simion J.P. Wessels A. Herghelegiu P. Dima C. Magureanu A. Radu D. Moisa
GSI - Darmstadt University of Heidelberg A. Andronic C. Lippmann D. Emschermann P. Braun-Munzinger D. Miskowiecz I. Rusanov C. Garabados R. Simon H.K. Solveit J. Hehner H. Stelzer J. Stachel M. Kalisky F. Uhling University of Frankfurt JINR Dubna H. Appelshäuser V. Babkin V. Golovatiouk S. Chernenko Yu. Zanevsky V. Geger V. Zryuev
Double sided read-out pad plane electrode prototype :
In beam tests :