1. Lothar Naumann Institut für Strahlenphysik Abteilung Hadronenphysik www.fzd.de Mitglied der Leibniz-Gemeinschaft MuCH Straw Tube Tracker - Motivations - Innovations - Prototypes - Summary and outlook

2. MuCH Straw Tube Tracker Lothar Naumann high spatial resolution high rate capability high radiation length high efficiency high robustness low occupancy STT in the last 3 detector stations? YES

3. MuCH Straw Tube Tracker Lothar Naumann single straw geometry 4 m; 4 mm robustness high detection efficiency 100% geom. acceptance 97%/m rate capability 4 MHz/cm 2 spatial resolution 200 m radiation length 0.2 % X 0 granularity > 10 cm 2 occupancy > 10%

4. MuCH Straw Tube Tracker Lothar Naumann Gas gain vs. HV

5. MuCH Straw Tube Tracker Lothar Naumann Counting rate vs. HV -> 200V plateau

6. MuCH Straw Tube Tracker Lothar Naumann single straw segmented straw end-plug spacer x/X 0 = 1 % granularity 2 cm 2 occupancy 2%

7. MuCH Straw Tube Tracker Lothar Naumann length of the insensitive detector part: 2 * 5 mm 18 mm 5 mm 4.5 mm 0 mm 10 mm

8. MuCH Straw Tube Tracker Lothar Naumann length of the insensitive detector part: 2 * 5 mm

9. MuCH Straw Tube Tracker Lothar Naumann HV supply + anode signal one connector at the wire output ~1mm crosstalk ~ 1% /m capacity 20 pF /m BV 3 kV x /X 0 0.1%

10. MuCH Straw Tube Tracker Lothar Naumann signal 50/1 noise

11. MuCH Straw Tube Tracker Lothar Naumann signal attenuation measurement, simulation < 10% /m

12. MuCH Straw Tube Tracker Lothar Naumann New Dubna Prototype STT 2x48 straws motherboards Straws Ø=4mm 4x10cm

13. MuCH Straw Tube Tracker Lothar Naumann Quality assessment for 360 connection lines 6%

14. MuCH Straw Tube Tracker Lothar Naumann What can we learn from the Cosy-TOF STT? 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

15. Lothar Naumann Institut für Strahlenphysik Abteilung Hadronenphysik www.fzd.de Mitglied der Leibniz-Gemeinschaft MuCH Straw Tube Tracker Summary 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 started Simulation for implementation of the Straw Tube Tracker with realistic parameters shows: The Straw Tube Tracker with segmented straws fulfill the CBM MuCH requirements!

16. Lothar Naumann Institut für Strahlenphysik Abteilung Hadronenphysik www.fzd.de Mitglied der Leibniz-Gemeinschaft MuCH Straw Tube Tracker 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. Lothar Naumann Institut für Strahlenphysik Abteilung Hadronenphysik www.fzd.de Mitglied der Leibniz-Gemeinschaft MuCH Straw Tube Tracker 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