473 research outputs found
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
First Tests of Gaseous Detectors Made of a Resistive Mesh
We describe here various detectors designs: GEM type, MICROMEGAStype,
PPACtype as well as cascaded detectors made of a resistive mesh manufactured
from a resistive Kapton foil, (20 microns thick, resistivity a few MOhm per
square) by a laser drilling technique. As in any other micropattern detectors
the maximum achievable gas gain of these detectors is restricted by the Raether
limit, however, the resistive mesh makes them and the front end electronics
fully spark protected. This approach could be an alternative or complimentary
to the ongoing efforts in developing MICROMEGAS and GEMs with resistive anode
readout plates and can be especially beneficial in the case of micropattern
detectors combined with a micropixel-type integrated front end electronic
An improved design of spark-protected microstrip gas counters (R-MSGC)
We have developed microstrip gas counters manufactured on standard printed
circuit board and having the following features: resistive cathode strips, thin
(10 micron) metallic anode strips and electrodes protected against surface
discharges by a Coverlay layer at their edges. These features allow the
detector to operate at gas gains as high as can be achieve with the best
microstrip gas counters manufactured on glass substrates. We believe that after
further developments this type of detectors can compete in some applications
with other micropattern detectors, for example MICROMEGAS.Comment: Presented at the 7th RD51 Collaboration meeting, CERN, April 201
Demonstration of new possibilities of multilayer technology on resistive microstrip/ microdot detectors
The first successful attempts to optimize the electric field in Resistive
Microstrip Gas Chamber and resistive microdot detectors using additional field
shaping strips located inside the detector substrate are describedComment: Presented at the RD-51 mmini week, CERN, June 201
First tests of "bulk" MICROMEGAS with resistive cathode mesh
We present the first results from tests of a MICROMEGAS detector manufactured
using the so-called "bulk" technology and having a resistive cathode mesh
instead of the conventional metallic one. This detector operates as usual
MICROMEGAS, but in the case of sparks, which may appear at high gas gains, the
resistive mesh reduces their current and makes the sparks harmless. This
approach could be complementary to the ongoing efforts of various groups to
develop spark-protected MICROMEGAS with resistive anode planes
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
Conceptual design of PrandtlPlane civil transport aircraft
According to aircraft manufacturers and several air transportation players, the main challenge the civil aviation will have
to deal with in the future is to provide a sustainable growth strategy, in order to face the growing demand of air traffic all
over the world. The sustainability requirements are related to air pollution, noise impact, airport congestion, competitiveness
of the air transportation systems in terms of travel time and passengers’ comfort. Among the possible ways to
allow a sustainable growth of the air transportation systems, disruptive aircraft configurations have been object of study
for several years, in order to demonstrate that the improvement of aircraft performance can enable the envisaged
growth. This paper presents the study of a possible novel configuration called ‘‘PrandtlPlane,’’ having a box-wing layout
derived from Prandtl’s ‘‘Best Wing System’’ concept. The paper deals with the definition of top level requirements and
faces the conceptual study of the overall configuration, focusing on fuselage sizing as well as on the aerodynamic design of
the box-wing system. This latter is designed through an optimization-driven strategy, carried out by means of a low fidelity
aerodynamic tool, which simulates the flow condition in the subsonic range and introduces correction to take the
transonic effects into account. Design procedures and tools are presented, showing preliminary results related to a
PrandtlPlane compliant with ICAO Aerodrome Reference Code ‘‘C’’ standard, such as Airbus A320 and Boeing 737,
whose wingspan is limited to 36 m. Activities and results here shown are part of the first phase of the research project
‘‘PARSIFAL’’ (Prandtlplane ARchitecture for the Sustainable Improvement of Future AirpLanes), funded by the European
Commission under the Horizon 2020 Program, which aims to demonstrate that the PrandtlPlane configuration can
improve aircraft payload capability, keeping their dimensions compatible with present airport infrastructures
The Successful Operation of Hole-type Gaseous Detectors at Cryogenic Temperatures
We have demonstrated that hole-type gaseous detectors, GEMs and capillary
plates, can operate up to 77 K. For example, a single capillary plate can
operate at gains of above 10E3 in the entire temperature interval between 300
until 77 K. The same capillary plate combined with CsI photocathodes could
operate perfectly well at gains (depending on gas mixtures) of 100-1000.
Obtained results may open new fields of applications for capillary plates as
detectors of UV light and charge particles at cryogenic temperatures: noble
liquid TPCs, WIMP detectors or LXe scintillating calorimeters and cryogenic
PETs.Comment: Presented at the IEEE Nuclear Science Symposium, Roma, 200
A methodological approach to assess the effect of organic, biodynamic, and conventional production processes on the intrinsic and perceived quality of a typical wine: The case study of chianti docg
The aim of this study was to propose a methodological approach to evaluate the impact of the organic, biodynamic, and conventional production processes on the intrinsic and perceived quality of a typical wine. For this purpose, fourteen commercial Chianti DOCG wines from the 2016 harvest were selected based on the type of production management. A survey was set up to get winemaking information from the estate’s producer of the wines to estimate the carbon dioxide production under the three types of management. The eligibility, identity, and style properties (the intrinsic quality) of the wines were defined. A group of 45 experts evaluated the differences between wines by the Napping test and rated their typicality (perceived quality). The organic and biodynamic management showed a lower level of estimated values of carbon dioxide production. The overall statistical elaboration of the chemical and sensory data highlighted that the registered differences of the intrinsic, perceived quality, and typicality level of the respective wines, did not depend on the type of management. The comparison of the three kinds of wine by SIMCA modeling, put in evidence that the conventional ones showed a greater homogeneity regarding chemical composition, sensory characteristics, and typicality
New designs of resistive microstrip gaseous detectors (R-MSGCs)
A new family of spark-protected micropattern gaseous detectors is introduced:
a 2-D sensitive restive microstrip counter and hybrid detectors, which combine
in one design a resistive GEM with a microstrip detector. These novel detectors
have several important advantages over other conventional micropattern
detectors and are unique for applications like the readout detectors for dual
phase noble liquid TPCs and RICHs
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