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TPC R&D News from DESY

TPC R&D News from DESY. Felix Sefkow DESY LC TPC Group American Linear Collider Workshop Arlington, Texas, January 9-11, 2003. Focus: TPC with GEM readout. Well known advantages Low material budget Minimal E x B effects Suppression of ion feedback 2D symmetry Fast signals.

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TPC R&D News from DESY

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  1. TPC R&D News from DESY Felix Sefkow DESY LC TPC Group American Linear Collider Workshop Arlington, Texas, January 9-11, 2003

  2. Focus: TPC with GEM readout • Well known advantages • Low material budget • Minimal E x B effects • Suppression of ion feedback • 2D symmetry • Fast signals Felix Sefkow: TPC R&D News from DESY

  3. This talk: • Read-out structure and resolution • Next TPC prototype • First measurements of charge transfer in GEMs at B = 5 Tesla Felix Sefkow: TPC R&D News from DESY

  4. Collaborative efforts of: • M.Killenberg, S.Lotze, J.Mnich, A.Münnich, S.Roth, B.Sobloher, M.Tonutti, M.Weber Aachen • T.Behnke, N.Ghodbane, M.Hamann, T.Kuhl, F.Sefkow, P.Wienemann DESY • R.Heuer, T.Lux, Hamburg • A.Vasiljev, Novosibirsk • A.Kaoukher, Rostock Felix Sefkow: TPC R&D News from DESY

  5. Optimize space resolution • Need charge sharing to apply centre-of-gravity methods: • Smaller pad size • Resistive foils • Large induction gap • Special pad shapes, e.g. chevrons Felix Sefkow: TPC R&D News from DESY

  6. Simulation results Rectangular pads Chevrons Induction gap 2mm 10mm 40mm Induction gap 2mm 10mm 40mm (assuming linear pad response function) Felix Sefkow: TPC R&D News from DESY

  7. Large test TPC Also: Test TDC read-out option, dE/dx by ToT (Rostock) (see A.Kaoukher’s talk at Prague) HV stable over months (now): Study long-term gain stability Felix Sefkow: TPC R&D News from DESY

  8. Measured resolution First measurements with chevrons B = 4 T: B = 0: Scale pad sizes according to diffusion • Qualitative behavior confirmed • to be continued, also @ B > 0 B = 0 Felix Sefkow: TPC R&D News from DESY

  9. Next TPC prototype • Fits into our new 5 T test magnet • Double GEM tower • 192 channels • To be ready in March • Laser system to be integrated Felix Sefkow: TPC R&D News from DESY

  10. Field cage design • Carbon fiber • HV stability tests problematic encouraging Felix Sefkow: TPC R&D News from DESY

  11. 5 Tesla test facility Felix Sefkow: TPC R&D News from DESY

  12. Aachen test TPC setup See M.Killenberg et al., preprint physics/0212005 Felix Sefkow: TPC R&D News from DESY

  13. Effects of magnetic field Felix Sefkow: TPC R&D News from DESY

  14. Measurements • Effective gain increases Felix Sefkow: TPC R&D News from DESY

  15. More studies at 5 Tesla • Ion feedback,… • Russian GEMs (Novosibirsk) • New DESY prototype • Munich test chamber • Karlsruhe • Carleton/Victoria CERN Felix Sefkow: TPC R&D News from DESY

  16. Conclusion • 5 T magnet R&D facility opened its doors • First GEM-TPC tests in the LC detector B field look encouraging • LC TPC group collaborating more closely, towards realistic tests Felix Sefkow: TPC R&D News from DESY

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