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- Motivations - Innovations - Prototypes - Summary and outlook

- Motivations - Innovations - Prototypes - Summary and outlook. STT in the last 3 detector stations?. high spatial resolution high rate capability high radiation length high efficiency high robustness low occupancy. YES. single straw. geometry 4 m;  4 mm

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- Motivations - Innovations - Prototypes - Summary and outlook

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  1. - Motivations - Innovations - Prototypes - Summary and outlook

  2. STT in the last 3 detector stations? • high spatial resolution • high rate capability • high radiation length • high efficiency • high robustness • low occupancy YES

  3. single straw geometry 4 m;  4 mm robustness high detection efficiency 100% geom. acceptance 97%/m rate capability 4 MHz/cm2 spatial resolution 200 m radiation length 0.2 % X0 granularity > 10 cm2 occupancy > 10%

  4. Gas gain vs. HV

  5. Counting rate vs. HV -> 200V plateau

  6. single straw segmented straw x/X0 = 1 % x/X0 = 1 % end-plug spacer granularity2 cm2 occupancy 2% spacer

  7. 18 mm 5 mm 4.5 mm 0 mm 10 mm length of the insensitive detector part: 2 * 5 mm

  8. length of the insensitive detector part: 2 * 5 mm

  9. ~1mm HV supply + anode signal one connector at the wire output crosstalk ~ 1% /m capacity 20 pF /m BV 3 kV x /X0 0.1%

  10. signal 50/1 noise

  11. signal attenuation measurement, simulation < 10% /m

  12. 2x48 straws motherboards New Dubna Prototype STT Straws Ø=4mm 4x10cm

  13. Quality assessment for360 connection lines 6%

  14. straws Ø=10mm 150cm 15 layers high precision positioning by an innovativ tube manufacturing process extremly good gas tightness even at high overpressure of 3bar extremly light construction 3g/straw no relevant ageing distortion What can we learnfrom the Cosy-TOF STT?

  15. R&D has been provided for: - segmented anods - segmented straws with small inefficient area - transmission lines of 2m length with low signal attenuation - high density readout of 1channel/mm at high potential (3 kV) - HV and gas supply startedSimulation for implementation of the Straw Tube Tracker with realistic parameters shows:The Straw Tube Tracker with segmented straws fulfill the CBM MuCH requirements! Summary

  16. Outlook -input from the absorber design for specified hardware requirements necessary-Prototype test:double-layer (2*48) multifold segmented straw detector is completed and will be tested in July 09 at CERN SPS

  17. JINR, Dubna – V. Peshekhonov, V. Lucenko, V. Mialkowski, D. Peshekhonov, A. Savenkov, K. Viryasov, A. Zinchenko Lebedev PI, Moscow – V. Tikhomirov Petersburg NPI, Gatchina – D. Seliverstov, E. Chernishova, L. Kudin, A. Nadtochi Univ. of Technology, Warsaw – K. Zaremba, J. Marzec FZ Jülich – P. Wintz FZ Dresden - Rossendorf, – L. Naumann GSI-INTAS-8729

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