Speaker
Christian Pauly
(Bergische Universitaet Wuppertal (DE))
Description
The CBM-RICH detector is an essential component of the
CBM experiment which will be build at the Facility for Antiproton
and Ion Research, FAIR, in Darmstadt.
It will serve for electron identification and pion suppression
for particle momenta up to ~8 GeV/c.
Pion suppression by up to 4 orders of magnitude is necessary in
order to get access to rare di-electron decays of light vector mesons,
such as the rho meson, one of the key observables to study the
highly compressed matter produced in the heavy ion collision process.
The CBM-RICH detector will use CO2 gas as radiator medium. Spatially resolved
detection of Cherenkov photons will be achieved using Multianode
Photomultipliers (MAPMT) or Microchannel plate detectors (MCP).
Only these devices can provide sufficient detection efficiency,
time resolution and rate capability necessary to operate the CBM
experiment at Au-Au interaction rates up to 10 MHz.
We have studied and compared in detail different sensor options,
such as the 2x2 inch Hamamatsu H8500, the new H12700, the 1x1 inch
R11265, or the XP85012 MCP from Photonis.
Single photon XY scans combined with a self triggered readout
system allow to achieve many different performance
parameters, such as efficiency, cross talk, and dark noise in a single
lab measurement.
During two test beam campaigns with a CBM-RICH prototype detector
at CERN-PS we could compare the different sensor options in beam.
In this poster, we present our studies with respect to the photon
detection system for the CBM-RICH detector.
On behalf of collaboration: | CBM |
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Primary author
Christian Pauly
(Bergische Universitaet Wuppertal (DE))