The production of the triple-GEM detectors for the innermost region of the first muon station of the LHCb experiment has started in February 2006, and is foreseen to be completed by the end of July. ...The final design of the detector and the construction procedure and tools, as well as the quality controls are defined. The performances of each detector, composed by two triple-GEM chambers equipped with dedicated CARDIAC-GEM front-end electronics, are studied with a cosmic ray telescope. The cosmic ray telescope has been set up including all the final off-detector components.
Fast triggering of high-rate charged particles with a triple-GEM detector Alfonsi, M.; Bencivenni, G.; Bonivento, W. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2004, Letnik:
535, Številka:
1
Journal Article
Recenzirano
A 3 year long R&D activity on triple gas electron multiplier (GEM) detectors is reported. This activity was made in the framework of the LHCb experiment in order to find the technology to instrument ...the central region of the first muon station (M1R1) where a high particle rate is expected. Detector geometry, gas mixture and electric field configuration have been optimized in order to achieve the performance required by the experiment. The use of a very fast, CF
4
based, gas mixture provides a time resolution of about 4.5
ns (r.m.s.) with a single chamber with gain less than 10
4
. In addition, an optimized gain sharing between the three GEMs allows to keep the discharge probability per incident hadron below 10
-
12
. The average number of firing pads per crossing particle have been found to be lower than 1.2. In a global aging test two detectors were exposed to a dose rate of 16
Gy/h. Each detector integrated about 2
C/cm
2
equivalent to more than 10 years of operation at LHCb. Good aging properties were measured. These results make the triple-GEM detectors a good solution for M1R1 and, in general, for a fast trigger in the presence of a high rate of charged particles.
The DAΦNE electron–positron collider at the Laboratori Nazionali di Frascati of INFN has made available a unique quality low-energy negative kaons “beam”. The SIDDHARTA experiment used this beam to ...perform unprecedented precision measurements on kaonic atoms, while the AMADEUS experiment plans to perform in the coming years precision measurements on kaon–nuclei interactions at low-energies, in particular to study the kaonic nuclei. The two experiments are briefly presented in this paper.
A triple-GEM detector for high-rate particle triggering Alfonsi, M; Bencivenni, G; de Simone, P ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/2004, Letnik:
525, Številka:
1
Journal Article
Recenzirano
We show that adding CF
4 to the standard Ar/CO
2 gas mixture allows to substantially improve the time resolution of triple-GEM detectors.
In this paper we discuss measurements of time resolution, ...discharge probability per incident charged particle and pad multiplicity of a triple-GEM detector with pad readout, with new gas mixtures with CF
4 and isobutane.
Results for detectors with GEM foil size of both
10×10
cm
2
and
20×24
cm
2
are presented.
The J-PARC E15 experiment has the aims to search for the simplest kaonic nuclear bound state,
K
−
pp
, by the in-flight
3
He(
K
−
,
n
) reaction. The exclusive measurement is performed by a ...simultaneous measurement of the missing mass using the knocked out neutron and the invariant mass via the expected decay,
K
−
pp → Λ
p
→
p
π
−
p
. In this paper, an overview of the experiment and current data analysis of the engineering runs performed in February and June 2012 are presented.
We report the results of a systematic study of the performance of
10×10
cm
2
triple-GEM detectors operated with several gas mixtures.
In a previous paper, we pointed out that adding CF
4 to the ...standard Ar/CO
2 gas mixture allows to improve the time resolution of the detector from
∼10
ns
down to
∼6
ns
(r.m.s.). In this paper, we discuss the results obtained with CF
4 and iso-C
4H
10-based gas mixtures, during a beam test at the πM1 beam facility of the Paul Scherrer Institute (PSI).
Preliminary results concerning the discharge probability of triple-GEM detector, when exposed to both high intensity pion/proton beam and α-particles from a radioactive source are presented. Gain measurements and aging tests, using a high intensity
5.9
keV
X-ray tube, are eventually discussed.
Measurement of GEM parameters with X-rays Bencivenni, G.; Bonivento, W.; Cardini, A. ...
IEEE transactions on nuclear science,
10/2003, Letnik:
50, Številka:
5
Journal Article
Recenzirano
The gas electron multiplier (GEM)-based detectors have been widely developed in past years and have been proposed for many different applications. In this paper, we report on a method able to provide ...information on the characteristic parameters of a GEM. A single-GEM detector is illuminated with a high-intensity flux of low energy (5.9 keV) photons and all the electrode currents are measured simultaneously. From the analysis of these measurements we extracted a phenomenological and analytical model able to describe the currents induced on the electrodes as a function of electric fields and GEM voltages when the detector is exposed to a continuous ionizing radiation. This model provides information on the characteristic GEM parameters. In conclusion we briefly describe other methods able to extract in a more direct way GEM parameters.
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