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DEVELOPMENT of FAST GAS DETECTORS for TRD (beamtest results)

DEVELOPMENT of FAST GAS DETECTORS for TRD (beamtest results). Yu. Zanevsky Laboratory of High Energies JINR ,Dubna Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004. 2 type of Detectors (from JINR) has been tested on the beam

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DEVELOPMENT of FAST GAS DETECTORS for TRD (beamtest results)

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  1. DEVELOPMENT of FAST GAS DETECTORS for TRD(beamtest results) Yu. Zanevsky Laboratory of High Energies JINR ,Dubna Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

  2. 2 type of Detectors (from JINR) has been tested on the beam at GSI in July 2004 with Ar/CO-2 and Xe/CO-2 gas mixture:1) MWPC (with drift gap) 2 mm anode-cathode gap 8 mm drift gap 2 mm anode pitch 10 x 10 cm ² area PAD readout (3 x 4 mm ²) 2) GEM-3 3 mm drit gap 3 ampl. stages 10 x 10 cm ² area PAD readout (10 x 20 mm ²) Y.Zanevsky,CBM Collaboration Meeting, GSI 6-8 October, 2004

  3. 9.6 M 470 pF 470 pF 8mm 0.5mm 2mm 1.2 M 1.2 M 2mm 470 pF 1000 pF 2mm 4mm 4mm 3mm 2 4 6 8 1 3 5 7 2 4 6 8 beam 1 3 5 7 AMPLIFICATION < 5 x 10 ³ Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

  4. Image of PAD (3 x 4 mm²) from MWPC was obtained with Si2 position sensitive Detector Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

  5. Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

  6. Y.Zanevsky,CBM Collaboration Meeting, GSI 6-8 October, 2004

  7. Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

  8. HV=2600V 1a - 2600 1 - 2600 2a - 2000 2 - 2000 3 - 1600 4a - 1400 4 - 1400 5 - 1000 6a - 600 6 - 600 7a - 200 7 - 200 470pf 3MΩ 1 1a 3.0MΩ E = 2000 V/cm V =600V 2a 3mm 10MΩ 2 2.0MΩ 400V 3 1.0MΩ E = 2000 V/cm V =200V 5MΩ 4 1mm 4a 400V 5 2.0MΩ E = 2000 V/cm V =400V • V 74.5μA • V 112 μA • V 134μA • 1900V 142μA • 2000V 149μA • 2200V 165μA • 2250V 168μA • 2300V 172μA • 2400V 179μA 2.0MΩ 2mm 2MΩ 6 6a 400V 7 2.0MΩ 2MΩ 7a E = 2000 V/cm V =200V 470pf 470pf 470pf 470pf 1mm 8 1.0MΩ 3 4 1 2 6 5 7 8 I = 200μA Pad size - 10 x 20 mm2 V=2600V Rtot=13.0MΩ Total Amplification ~ 10 000 Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

  9. MWPC Amplification ~ 5 000 Mean PH ( from DETECTORS) GEM-3 Amplification ~ 10 000 Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

  10. MWPC Ar/CO2 – 85/15 Ua = 1365 V Ud = -900 V files: 170-174 Xe/CO2 – 85/15 Ua = 1544 V Ud = 1000 V files: 186-190 Y.Zanevsky,CBM Collaboration Meeting, GSI 6-8 October, 2004

  11. GEM - 3 Ar/CO2 – 85/15 Ugem = 2590 V files 170-174 Xe/CO2 – 85/15 Ugem = 2590 V files: 186-190 Y.Zanevsky,CBM Collaboration Meeting, GSI 6-8 October, 2004

  12. TEST with beam (file 195 ) Thickness of Xe/CO-2 in MWPC - 12 mm Thickness of fiber radiator - 30 mm The ratio of Amplitudes between e and pions we got from MWPC was > 2,5 Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

  13. CONCLUSIONS Stable operation of MWPC (with drift gap) and GEM-3 with Ar-CO2 and Xe-CO2 gas mixture on the beam with intensity up to ~ 100 kHz / cm ². To do (under discussion) - Test of Detectors with higher intensity (and high multiplicity) - Further tests of MWPCandGEM-3 stability - Redesign of Amplifier The work is supported by GSI / INTAS Grant No. 03-54-4169 and JINR/BMBF Grant (2004) Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

  14. I would like to thank: V. Golovatjuk, S. Chernenko, V. Zrjuev, V.Kozin (Dubna) N. Shumeiko, O. Dvornikov, V. Chekhovskoi (Minsk) G. Benceveni (Frascati) C. Garabatos, A. Andronic, F. Uhlig (GSI) M. Petrovici (Bucharest) Y.Zanevsky, CBM Collaboration Meeting, GSI 6-8 October, 2004

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