1,362 research outputs found
A New Supersensitive Flame Detector and its Use for Early Forest Fire Detection
A new flame detector, three orders of magnitude more powerful than the
existing ones, is presented. This detector needs to be mass-produced for its
use in order to be incorporated in an early forest fire detection system. A
project able to implement its use to overcome the forest fire emergency is
described
Gain limits of a Thick GEM in high-purity Ne, Ar and Xe
The dependence of the avalanche charge gain in Thick Gas Electron Multipliers
(THGEM) on the purity of Ne, Ar and Xe filling gases was investigated. The
gain, measured with alpha-particles in standard conditions (atmospheric
pressure, room temperature), was found to considerably drop in gases purified
by non-evaporable getters. On the other hand, small N2 admixtures to noble
gases resulted in high reachable gains. The results are of general relevance in
the operation of gas-avalanche detectors in noble gases, particularly that of
two-phase cryogenic detectors for rare events.Comment: 15 pages, 6 figures, submitted to JINS
On the physics and technology of gaseous particle detectors
Despite an already long and fruitful history, gaseous elementary-particle
detectors remain today an important mainstay of high-energy and nuclear physics
experiments and of radiation detection in general. In here we briefly describe
some of the gaseous detector's main technologies and applications, along with
some unsolved gas-discharge physics aspects of practical relevance.Comment: Submitted to Plasma Sources in Science and Technolog
R&D results on a CsI-TTGEM based photodetector
The very high momentum particle identification detector proposed for the
ALICE upgrade is a focusing RICH using a C4F10 gaseous radiator. For the
detection of Cherenkov photons, one of the options currently under
investigation is to use a CsI coated Triple-Thick-GEM (CsI-TTGEM) with metallic
or resistive electrodes. We will present results from the laboratory studies as
well as preliminary results of beam tests of a RICH detector prototype
consisting of a CaF2 radiator coupled to a 10x10 cm2 CsI-TTGEM equipped with a
pad readout and GASSIPLEX-based front-end electronics. With such a prototype
the detection of Cherenkov photons simultaneously with minimum ionizing
particles has been achieved for the first time in a stable operation mode
90 m ÎČ * optics for ATLAS/ALFA
http://accelconf.web.cern.ch/AccelConf/IPAC2011/papers/tupz002.pdfInternational audienceWe describe a high ÎČâ optics developed for the ATLAS detector at the LHC interaction point IP1. Roman Pots have been installed 240 m left and right of IP1 to allow to measure the absolute luminosity and the total elastic cross section for ATLAS with ALFA (Absolute Luminosity for ATLAS). Ultimately, it is planned to perform these mea- surements at a very high ÎČâ of 2625 m. Here we describe a new, intermediate ÎČâ = 90 m optics, which has been opti- mized for compatibility with the present LHC running con- ditions. We describe the main features and the expected performance of this optics for ALFA
The current progress of the ALICE Ring Imaging Cherenkov Detector
Recently, the last two modules (out of seven) of the ALICE High Momentum
Particle Identification detector (HMPID) were assembled and tested. The full
detector, after a pre-commissioning phase, has been installed in the
experimental area, inside the ALICE solenoid, at the end of September 2006. In
this paper we review the status of the ALICE/HMPID project and we present a
summary of the series production of the CsI photo-cathodes. We describe the key
features of the production procedure which ensures high quality photo-cathodes
as well as the results of the quality assessment performed by means of a
specially developed 2D scanner system able to produce a detailed map of the CsI
photo-current over the entire photo-cathode surface.
Finally we present our recent R&D efforts toward the development of a novel
generation of imaging Cherenkov detectors with the aim to identify, in heavy
ions collisions, hadrons up to 30 GeV/c.Comment: Presented at the Imaging-2006 Conference, Stockholm, Sweden, June
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