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Zeev Fraenkel, Boris Khachaturov, Alexander Kozlov,

HBD R&D at the WIS. Zeev Fraenkel, Boris Khachaturov, Alexander Kozlov, Ilia Ravinovich, Itzhak Tserruya and Suijian Zhou Weizmann Institute of Science De December 4, 2002. R&D issues: * detector configuration * detector granularity

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Zeev Fraenkel, Boris Khachaturov, Alexander Kozlov,

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  1. HBD R&D at the WIS Zeev Fraenkel, Boris Khachaturov, Alexander Kozlov, Ilia Ravinovich, Itzhak Tserruya and Suijian Zhou Weizmann Institute of Science De December 4, 2002 • R&D issues: * detector configuration * detector granularity * response to hadrons and electrons * effect of residual magnetic field * aging * realistic MC * CF4 scintillation * front-end electronics

  2. GEMs in other experiments HERAB: * http://www.physi.uni-heidelberg.de/groups/herab * hep-ex/0204011 COMPASS: * http://wwwcompass.cern.ch

  3. Aging: (I) CsI Realistic Pessimistic Min bias (in PHENIX acceptance) e 3 x 40 6 x 40 h 80 x 4 160 x 4 Gain 104 5 104 Ion feedback 0.5 1 Interaction rate at design L / 4L (s-1) 1400 5600 Operation per year (s) 1 107 3 107 Years of operation 10 10 Detector area R=70cm (cm2) 1.3 104 Total charge in 10 y of operation 3.8 C/cm2 0.9 mC/cm2 Photon and ion induced aging studies from literature: 20% QE loss after 100 – 10 000 C/cm2

  4. Aging: (II) GEM • Aging studies of HERA-B: • * no significant change in gain in Ar/CO2 after 15mC/mm2 • Published results and our estimates are encouraging. • BUT • we must do our own aging study for the combination of • CsI + GEM + CF4

  5. Detector Configuration • Stable operation at a gain of 104 Options: 2 GEMs 3 GEMs 2 GEMs + MWPC 3 GEMs + MWPC CF4 + Ne mixture Need to define “stable”

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