Staedtebausoziologische Untersuchungen ueber das Verhalten und die Erwartungen der Bewohner im wohnungsnahen Bereich mit Schlussfolgerungen fuer die Gestaltung und Ausstattung dieses Bereiches in Neubau- und Umgestaltungsgebieten T. 2: Die Erwartungen der Bewohner an den engeren Wohnbereich ; Analysen der Wohnwertvorstellungen zur Bestimmung der Wohnqualitaet des engeren Wohnbereichs und seiner Elemente

IZ Sozialwissenschaften, Berlin, B 2211- GL 149 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

High counting rate, two-dimensional position sensitive timing RPC

Resistive Plate Chambers (RPCs) are widely employed as muon trigger systems at the Large Hadron Collider (LHC) experiments. Their large detector volume and the use of a relatively expensive gas mixture make a closed-loop gas circulation unavoidable. The return gas of RPCs operated in conditions similar to the experimental background foreseen at LHC contains large amount of impurities potentially dangerous for long-term operation. Several gas-cleaning agents, characterized during the past years, are currently in use. New test allowed understanding of the properties and performance of a large number of purifiers. On that basis, an optimal combination of different filters consisting of Molecular Sieve (MS) 5Å and 4Å, and a Cu catalyst R11 has been chosen and validated irradiating a set of RPCs at the CERN Gamma Irradiation Facility (GIF) for several years. A very important feature of this new configuration is the increase of the cycle duration for each purifier, which results in better system stability and, if needed, it would permit to increase the gas flow in the detectors during the high luminosity running periods at LHC. During the test of the new filters configuration, the detector performances were monitored in terms of current stability and Bakelite resistivity