Abstract
A small-size prototype of a new Ring Imaging Cherenkov (RICH) detector using for the first time pressurized C4F8O radiator gas and a photon detector consisting of MWPC equipped with a CsI photocathode has been built and tested at the PS accelerator at CERN. It contained all the functional elements of the detector proposed as Very High Momentum Particle Identification (VHMPID) upgrade for the ALICE experiment at LHC to provide charged hadron track-by-track identification in the momentum range starting from 5 potentially up to 25GeV/c. In the paper the equipment and its elements are described and some characteristic test results are shown.
Highlights
Very High Momentum Particle Identification (VHMPID) detector has been proposed to enhance the track-by-track particle identification (PID) capabilities of the ALICE experiment at LHC [6] for charged hadrons (p, π, K) in the momentum range from 5 potentially up to 25 GeV/c and with this to extend its range to higher momenta with respect to the present 2–5 GeV/c provided by the already running HMPID (High Momentum Particle Identification Detector) [7]
The photon detector is an MWPC with CsI photocathode based on the HMPID experience
As the aim of this paper is to describe the technical aspects of the VHMPID prototype and the beam-test setup the most characteristic results are presented here mainly to show the operation and performance of the prototype
Summary
VHMPID detector has been proposed to enhance the track-by-track particle identification (PID) capabilities of the ALICE experiment at LHC [6] for charged hadrons (p, π, K) in the momentum range from 5 potentially up to 25 GeV/c and with this to extend its range to higher momenta with respect to the present 2–5 GeV/c provided by the already running HMPID (High Momentum Particle Identification Detector) [7]. The longitudinal dimension of the modules is determined by the available space in ALICE in front of the electromagnetic calorimeter (DCAL) leaving about 70 cm length for the full unit. This gives an upper limit of about 50 cm for the length of the radiator with the photon detector. To experimentally prove the concept briefly described above and to study the functionality of its elements a VHMPID prototype has been built and tested at the T10 experimental zone in the East Hall of the PS accelerator at CERN.
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