engleski

A glass type Multistrip-MRPC prototype for the low rate region of the CBM Time-of-Flight wall

The Compressed Baryonic Matter spectrometer (CBM) is expected to be operational in the year 2018 at the Facility for Anti-proton and Ion Research (FAIR) in Darmstadt, Germany. The key element providing hadron identification at incident energies between 2 and 10 AGeV is a Time-of-Flight (ToF) wall covering the polar angular range from 2.5 degrees-25 degrees and full azimuth. The necessary particle identification capabilities require a 80 ps system time resolution at high efficiency and, simultaneously, a rate capability of up to 25 kHz/cm(2). The existing conceptual design foresees a 120 m(2) ToF-wall composed of Multi-gap Resistive Plate Chambers (MRPC) which is subdivided in five rate depending concentric arranged regions named A to E where A is the area having fluxes below 1 kHz/cm(2) in average. For this region A which covers approximately 55% of the total area we developed a Multistrip-MRPC containing float glass as resistive electrode material. In this paper we present the design of this prototype and in particular results obtained during in beam tests at GSI/SIS18 at Darmstadt and COSY at Julich.

nuclear physics; heavy-ions; Time-of-Flight; Multi-gap Resistive Plate Chambers

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