8 research outputs found
Response of microchannel plates in ionization mode to single particles and electromagnetic showers
Hundreds of concurrent collisions per bunch crossing are expected at future
hadron colliders. Precision timing calorimetry has been advocated as a way to
mitigate the pileup effects and, thanks to their excellent time resolution,
microchannel plates (MCPs) are good candidate detectors for this goal. We
report on the response of MCPs, used as secondary emission detectors, to single
relativistic particles and to electromagnetic showers. Several prototypes, with
different geometries and characteristics, were exposed to particle beams at the
INFN-LNF Beam Test Facility and at CERN. Their time resolution and efficiency
are measured for single particles and as a function of the multiplicity of
particles. Efficiencies between 50% and 90% to single relativistic particles
are reached, and up to 100% in presence of a large number of particles. Time
resolutions between 20ps and 30ps are obtained.Comment: 20 pages, 9 figures. Paper submitted to NIM
Measurement of the branching fraction of at KEDR
We present the study of the decay . The results
are based on of 5.2 million events collected by the KEDR detector at
VEPP-4M collider. The branching fraction is measured to be
where the first uncertainty is statistical, the second one
is systematic. This is the most precise single measurement of this quantity at
the moment
Aerogel Cherenkov Counters of the KEDR Detector
The particle identification system of the KEDR detector is based on aerogel threshold Cherenkov counters called ASHIPH counters. The system consists of 160 counters arranged in two layers. An event reconstruction program for the ASHIPH system was developed. The position of each counter relative to the tracking system was determined using cosmic muons and Bhabha events. The geometric efficiency of the ASHIPH system was verified with Bhabha events. The efficiency of relativistic particle detection was measured with cosmic muons. A Ï/K separation of 4ÎŽ in the momentum range 0.95 â1.45 GeV/c was confirmed. A simulation program for the ASHIPH counters has been developed
Aerogel mass production for the CLAS12 RICH: Novel characterization methods and optical performance
A large area ring-imaging Cherenkov detector has been designed to provide clean hadron identification
capabilities in the momentum range from 3 GeV/c to 8 GeV/c for the CLAS12 experiments at the Jefferson Lab
upgraded 12 GeV continuous electron beam accelerator facility. The adopted solution foresees a novel hybrid
optics design based on an aerogel radiator, composite mirrors and densely-packed and highly-segmented
photon detectors. Cherenkov light will either be imaged directly (forward tracks) or after two mirror reflections
(large angle tracks). The status of the aerogel mass-production and the assessment studies of the aerogel optical
performance are here reported