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HIGH COUNTING RATE TRANSITION RADIATION DETECTOR

HIGH COUNTING RATE TRANSITION RADIATION DETECTOR. Bucharest Prototype In Beam Tests. Transition Radiation Detectors. ALICE - TRD ATLAS - TRT - type (radiator+drift chamber + MWPC) (radiator + straw tubes)

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HIGH COUNTING RATE TRANSITION RADIATION DETECTOR

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  1. HIGH COUNTING RATE TRANSITION RADIATION DETECTOR Bucharest Prototype In Beam Tests Mariana Petris, NIPNE Bucharest CBM Meeting, March 9 -12, 2005

  2. Transition Radiation Detectors ALICE - TRD ATLAS - TRT - type (radiator+drift chamber + MWPC) (radiator + straw tubes) - rej (at 90% e efficiency) 100 100 - Maximum drift time 2 s 40 ns - Counting rates ~ 100 Hz/cm2 ~ 1MHz/ cm2 - Granularity (channel size) high (~6 cm2) low (~20cm2) CBM - TRD Counting rates ~ 100 KHz/cm2 High granularity - rej (at 90% e efficiency) > 100

  3. HCRTRD - prototype - type: radiator + MWPC; 2.5 mm anode pitch - maximum drift time: ~ 100 ns - channel size: 6 cm2

  4. 55FeSource Tests IFIN - HH 55Fe tests 30% CO2 + 70% Ar HV 1920 V; Readout: PASA (2 mV/fC, 1800 e rms) + ADC Converter Energy Resolution : ~10% (); ~25% FWHM GSI 55Fe tests 15% CO2 + 85% Ar HV 1700 V; Readout:PASA (2mV/fC, 1800 e rms) + FADC Converter Energy Resolution: ~ 8.6 % (); ~20 % FWHM

  5. Beam Test Goal of the experiment: detector performance in high counting rate environment Experimental Setup: - 2 Scintillators (ToF, trigger); - 2 Si - Strip Detectors (position information); - 2 MWPC - GSI (10 x 10 cm2 ) - 1 MWPC - Bucharest (24 x 24 cm2 ) -1 MWPC - Dubna (10 x 10 cm2 ) - 1 GEM - Dubna - Pb - glass calorimeter (last run) - FADC readout ; DAQ (MBS)

  6. Beam Composition e/ vs. rate  not possible, too low e intensities at SIS /p @ 1 GeV/c  too low rates; p/d @ 2 GeV/c rate dependence studies.  p p d  p p d

  7. Beam Profile x1 > 10 mm; x2 > 10 mm; Si1 length  20; Si2 length  20. 2 s 2 s 0.2 s 0.2 s

  8. Gain - 2s spill length,for protons 2 s 1850 V 0.2 s 1850 V

  9. Average Pulse Height 15% CO2 + 85% Ar, continuous anode, 1750 V 15%CO2 + 85% Ar, split anode, 1725 V <PH>(mV/0.74) 2 s 0 % 2 s 0 % 0 % 1 s 1 s 1 s 0.7 % 0.5 s 0.5 s 0.5 s 0 % 3.5 % 0.2 s 0.2 s 13.3% 2%

  10. ToF Spectra

  11. Pulse Height and Charge Spectra

  12. e/ Discrimination

  13. Pulse Height and Charge Spectra  MPV value (from landau fit of PH and Q proton spectra) as a function of rate

  14. High Counting Rate Effect (11.7  1.8) % (4.2  1.2) % (0.4  1) % (3.2  2.1) %

  15. High Counting Rate Effect (8.4  3.9) % (8.9  1.4) % (2.2  1.4) % (5  3.4) %

  16. High Counting Rate Effect (6.8  1.5) % (5.8  1.9) % (3.4  1.5) % (3.2  1.1) %

  17. Conclusions Although • Diagnostic system not specific for hcr environment  limited performance • Modest statistics  limiting factor for detailed analysis in terms of: • - Beam profile • - Spill profile • Much to low systematics for negatives (e/) The results of the first in-beam tests of such a geometry seem to recommend it as a solution for a major percentage of the CBM TRD subdetector. Participants: Bucharest, Dubna, GSI, Heidelberg and Münster

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