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Scope of the work To develop: • high speed ( ~5 x 10 5 / cm ²s) • high granularity

R&D on Fast Gas Detector Yu. Zanevsky, S. Chernenko, O.Fateev, V. Golovatjuk, L. Smykov, V. Zrjuev, (LHE JINR, Dubna). Scope of the work To develop: • high speed ( ~5 x 10 5 / cm ²s) • high granularity • low mass Gas Detector.

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Scope of the work To develop: • high speed ( ~5 x 10 5 / cm ²s) • high granularity

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  1. R&D on Fast Gas DetectorYu. Zanevsky, S. Chernenko, O.Fateev, V. Golovatjuk, L. Smykov, V. Zrjuev,(LHE JINR, Dubna) Scope of the work To develop: • high speed ( ~5 x 10 5 / cm²s) • high granularity • low mass Gas Detector In this R&D participate also: GSI (Darmstadt), INFN (Frascati),NC PHEP (Minsk), University (Muenster) CBM Coll. Meeting GSI, February 11-13, 2004

  2. Electron microscope picture of a GEM foil Electron microscope view of a cross-section through one hole GEM Cu / KAPTON / Cu - 5/50/5 mkm Pitch – 140 mkm Hole – 70 mkm Center – 45 mkm C. Altunbas et al. Nucl .Instr. Meth. A 490 (2002), 177-203 CBM Coll. Meeting GSI, February 11-13, 2004

  3. Gas Electron Multiplier (GEM) ЛВЭ ЛВЭ Drift gap – 8 mm Transfer gap – 2 mm Induction gap – 2 mm F.Sauli, Nucl. Instr. Meth. A 461 (2001), 47-54 CBM Coll. Meeting GSI, February 11-13, 2004

  4. Schematic view of double GEM assembly _____________________________________________ DRIFT space 8 mm GEM-1 2 mm GEM-2 2 mm PAD plane CBM Coll. Meeting GSI, February 11-13, 2004

  5. TEST of DOUBLE GEM DETECTOR Xe/C02 80/20 ΔVGEM1 = 450 V ΔVGEM2 = 450 V Fe-55 VD = 3600 V V1U = 1900 V V1D = 1450 V V2U = 950 V V2D = 500 V 8mm 2mm 2mm CBM Coll. Meeting GSI, February 11-13, 2004

  6. Counting plateau _____________________________________________ Ug2=400v CBM Coll. Meeting GSI, February 11-13, 2004

  7. Counting plateau _____________________________________________ Ug2=450v CBM Coll. Meeting GSI, February 11-13, 2004

  8. Rate capability of double GEM detector _____________________________________________ Ug1=400V Ug2=400V CBM Coll. Meeting GSI, February 11-13, 2004

  9. Test signal from PAD ____________________________________________________ t = 4 ns CBM Coll. Meeting GSI, February 11-13, 2004

  10. Signals from PAD of double GEM detector ___________________________________________________ t = 8 ns t = 11 ns Ug1=Ug2=400V CBM Coll. Meeting GSI, February 11-13, 2004

  11. CONCLUSIONS AND TO DO_____________________________________________ Double GEM detector (10 x 10 cm²) is constructed and tested in laboratory conditions with - good efficiency, - high count rate ( ~107 1/cm2 sec ), - low budget material (~ 5% Xo ). We intend to - study the triple GEM detector, - optimize PAD readout to get spatial resolution ~ 0,3-0,5 mm, - decrease an energy in discharge. CBM Coll. Meeting GSI, February 11-13, 2004

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