1,392 research outputs found
Gain, Rate and Position Resolution Limits of Micropattern Gaseous Detectors
In this study we report the results of a systematic study of the gain, rate
and the position resolution limits of various micropattern gaseous detectors.
It was found that at low rates (<1 Hz/mm^2) each detector has it own gain
limit, which depends on the size and design features, as well as on gas
composition and pressure. However, in all cases the maximum achievable gain is
less than or equal to the classical Raether limit. It also was found that for
all detectors tested the maximum achievable gain drops sharply with the
counting rate. The position resolution of micropattern detectors for detection
of X-rays (6 to 35 kV) was also studied, being demonstrated that with solid
converters one could reach a position resolution better than 30 micrometers at
1 atm in a simple counting mode.Comment: 10 pages, 3 figures, Presented at the PSD99-5th International
Conference on Position-Sensitive Detectors, 13-17 th September 1999,
University College, Londo
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
Resistive MSGC with double layered electrodes
The first successful attempts to optimize the electric field in Resistive
Microstrip Gas Chamber (RMSGC) using additional field shaping strips located
inside the detector substrate are described.Comment: Presented at 13th RD51 Collaboration meeting, CERN, Febr. 201
Advances in Micro-Pattern Gaseous Detectors and their Applications
In the last decade, several new imaging gaseous detectors, called
micro-pattern gaseous detectors, have been conceived and rapidly developed. In
this paper, the most popular designs of these detectors and their applications
to high energy physics and astrophysics experiments will be described. The main
focus of this review will however be on the ongoing activities on practical
applications of micro-pattern detectors to medicine and industryComment: An invited talk at the IWASI-2009 Conference, Trani, Italy, 200
Progress in Developing Hybrid RPCs: GEM-like Detectors with Resistive Electrodes
We have recently developed an innovative detector of photons and charged
particles: a GEM-like gaseous amplification structure with resistive electrodes
instead of commonly used metallic ones. This novel detector combines the best
property of GEMs- the capability to operate in a cascaded mode and in poorly
quenched gases - and of RPC: the protection against sparks. In this paper will
shortly review our latest achievements in this direction, however the main
focus will be given on a new advanced design that allows to build large area
detectors manufactured by a screen printing technology. The proposed detector,
depending on the applications, can operate either in a GEM mode (electron
multiplications through holes only) or as a hybrid RPC with simultaneous
amplifications in the drift region and in the holes. The possible applications
of this new detector will be discussed
Further developments and tests of microstrip gas counters with resistive electrodes
We present results from further tests of Microstrip Gas Counters (MSGCs) with
resistive electrodes. The maim advantage of this detector is that it is
spark-protected: in contrast to "classical" MSGCs with metallic electrodes,
sparks in this new detector do not destroy its electrodes. As a consequence the
MSGC with resistive electrodes is more reliable in operation which may open new
avenues in applications. One of them which is under investigation now is the
use of Resistive electrodes MSGC (R-MSGC) as photodetector in some particular
designs of noble liquid dark matter detectors.Comment: Presented at the RD-51 mini-week at CERN, January 17, 201
Detection of the primary scintillation light from dense Ar, Kr and Xe with novel photosensitive gaseous detectors
The detection of primary scintillation light in combination with the charge
or secondary scintillation signals is an efficient technique to determine the
events t=0 as well as particle / photon separation in large mass TPC detectors
filled with noble gases and/or condensed noble gases. The aim of this work is
to demonstrate that costly photo-multipliers could be replaced by cheap novel
photosensitive gaseous detectors: wire counters, GEMs or glass capillary tubes
coupled with CsI photocathodes. We have performed systematic measurements with
Ar, Kr and Xe gas at pressures in the range of 1-50 atm as well as some
preliminary measurements with liquid Xe and liquid Ar. With the gaseous
detectors we succeeded in detecting scintillation light produced by 22 keV
X-rays with an efficiency of close to 100%. We also detected the scintillation
light produced by bs (5 keV deposit energy) with an efficiency close to 25%.
Successful detection of scintillation from 22 keV gammas open new experimental
possibilities not only for nTOF and ICARUS experiments, but also in others,
like WIMPs search through nuclear recoil emission
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