1,722,450 research outputs found
Characterization of the Outer Barrel Modules for the upgrade of the ALICE Inner Tracking System
Full text linkThe Inner Tracking System (ITS) Upgrade of the ALICE detector at CERN is one of the major upgrades that will take place in 2019–2020. This paper regards the construction procedure and the electrical characterization of the Outer Barrel Module. This is the building element of the four outer layers of the ITS and it is realized assembling together fourteen Monolithic Active Silicon Pixel Sensors with a space precision of the order of few microns. The challenge of the production chain, the characterization test procedure and the results of the first produced prototypes will be shown
High dose rate irradiations simulations and measurements at the TIFPA-INFN x-ray station
No full textThe TIFPA-INFN center is equipped with a 3 kW tungsten anode x-ray irradiation station
used for biological and biophysics irradiations on cells and radiation damage studies on silicon
sensors. Since in recent years the importance for high dose rate irradiations is emerging,
not only for solid state silicon radiation damage studies but primarily for flash irradiation
activities on cells for oncological studies, it is becoming mandatory to explore the limits
of the irradiation stations. In this talk the station spectrum simulation realized with the
spekpy python code for different operative station configurations and the corresponding dose
rate measurements realized with a PTW FarmerChamber will be described
Studies for a Micro Vertex System in a EIC Detector using Monolithic Active Pixel Sensors
No full textMore than thirty years after Quantum Chromo-Dynamics (QCD)
was rst proposed as the fundamental theory of the strong force, very little is still
known about the dynamical basis of the hadron structure. We still don't know com-
pletely where fundamental quantities of the nucleons like spin came from or what
is the space distribution of gluons in nucleons. To investigate these fundamental
questions a new Electron Proton/Ion Collider (eRHIC) is proposed to be built at
Brookhaven National Laboratory. The inner tracking system of the detector in this
collider will require very high granularity, very low material budget, hermetic cover-
age and a radiation hard design. For this detector it will be crucial to identify tracks
of charged low momentum leptons at high rapidities. In this talk, an overview will
be given on the eRHIC collider project at BNL, on the present design of the eRHIC
detector. Further it will be shown that Monolithic Active Pixel Sensor (MAPS)
realized with CMOS technology satisfy all these requirements and rst test results
of these sensors will be provided
Silicon Sensors beam test at the Trento proton-line
No full textThe Trento Proton Line is a proton source with energy range between 70 and 230 MeV used for both biological and instrumentation test and measurements.
This beam line is very useful for silicon sensors characterization.
Two set-up were tested in 2018 and 2019: MAPS pixel sensor and SiPM
Ionizing and Non-Ionizing Energy Loss irradiation studies with 70-230 MeV protons at the Trento Proton Therapy Center
No full textProton induced Ionizing and Non-Ionizing energy loss campaigns are required studies for silicon sensors
and electronic devices qualification when designed for medical, space and high energy physics
applications.
The Experimental Area of the Trento Proton Therapy Center offers the possibility to perform these
studies using a 70-230 MeV proton beam designed for medical treatment of oncological patients. This
area, used only for non medical applications, is equipped with two beamlines reserved for biological
experiments, silicon sensor tests and electronic device qualifications. One of these lines is also
equipped with a unique passive beam modulator system, called double ring, where large area proton
irradiation on silicon sensors and electronic devices can be performed.
In this talk a description of the beam parameters and irradiation regime possibilities will be given,
and also the description of a new set-up used in September 2020 for single event upset rate measurement
on a electronic device
Un tracciatore per particelle cariche nello spazio basato sul sensore ALPIDE
No full textI sensori al silicio di tipo pixel monolitici attivi
(MAPS) sono sempre piu’ impiegati come
rivelatori di particelle cariche per via del loro
ridotto spessore, la bassa tensione di
svuotamento necessaria e la possibilita' di
realizzarli con processi CMOS commerciali.
Sono in corso degli studi di fattibilita’ per
tracciatori spaziali basati sul sensore ALPIDE,
sviluppato al CERN per il progetto Alice ITS
Upgrade
Operational experience and aging studies of the CDF Run II Silicon Vertex Detector
No full textThe Collider Detector at Fermilab (CDF) pursues a broad physics program at Fermilab’s Tevatron
proton-antiproton collider. Since its commissioning in early 2001 the CDF Run II detector delivered
about 10 fb−1 of integrated luminosity of data. CDF has installed 8 layers of silicon microstrip
detectors. In this talk will be described the operational challenge encountered over the past 10 years
and present detailed detector performance results with emphasis on radiation damage of the silicon
sensors
Analysis of Bs->phiphi decay mode
No full textAn interesting decay mode of the Bs meson is into a phi pair: this is a
vector-vector decay dominated by b->sss penguin transition which is a
sensitive probe for possible new physics effects. The only existing sample
of this mode was reconstructed by the CDF experiment from 0.2 fb-1 of data,
and consisted of only 8 signal events. Here we present new results based
on a clean sample of about 300 Bs->phiphi decays reconstructed by the CDFII
detector in a dataset with an integrated luminosity of about 3 fb-1
The pixel module for the Inner Tracking System upgrade of ALICE at LHC
No full textThe ALICE (A Large Ion Collider Experiment) detector at the CERN LHC collider was designed to address
the physics of strongly interacting matter, and in particular the properties of the Quark-Gluon
Plasma (QGP) using proton-proton, proton-nucleus, and nucleus-nucleus collisions. Even if with
this physics goal a lot of important results were already reached, there are still several fundamental
measurements to be finalized, like high precision measurements of rare probes (D, B mesons and
Lambda barions decays) over a broad range of transverse momenta. In order to achieve these new
results, a wide upgrade plan was approved that combined with a significant increase of luminosity
will enhance the ALICE physics capabilities enormously.
The ALICE Inner Tracking System (ITS) upgrade is one of the major improvements of the experimental
set-up that will take place in 2019-2020 where the whole ITS sub-detector will be replaced with
a new one realized using a innovative CMOS Monolithic Active Pixel silicon Sensor (MAPS), called
ALPIDE. This new upgraded ITS will be realized using more than twenty-four thousand ALPIDE
chips organized in seven different cylindrical layers surrounding the ALICE interaction point along
the beam-line, for a total surface of about ten square meters. The main features of the future ALICE
ITS are a low material budget, high granularity and low power consumption. All these peculiar capabilities
will allow for full reconstruction of rare heavy flavor decays and the achievement of the
physics goals.
In this talk after a description of new ALIPIDE pixel chip and the whole ITS upgrade project, will be
presented the construction procedure of the basic building block of the detector, namely the module,
and the laboratory characterization of this element
Characterization of radiation damages on Silicon photomultipliers by X-rays up to 100 kGy
No full textSilicon photomultipliers (SiPMs) are highly-sensitive photodetectors emerging as the technology of choice for many applications, including among the others, large high-energy physics experiments and detectors for space instruments, where they are often exposed to a large amount of radiation. In recent years, there has been an increasing interest in assessing the performance deterioration of such detectors after ionizing and non-ionizing radiation, such as protons, neutrons and X or gamma rays. It is therefore interesting to characterize the effect of irradiation on such Geiger-mode detectors, differentiating between the ionizing and non-ionizing energy-loss effects. Moreover, it is interesting to compare the radiation damage effects on several types of SiPMs, to assess the main phenomena and the deterioration mechanisms, aiming to a more radiation tolerant SiPM design.
In this work we irradiated several types of SiPM structures, produced in FBK (Trento, Italy), with 40 keV X-rays, at several doses, up to 100 kGy (in silicon), performing both online measurements (after each irradiation step) and offline functional characterization, after one month of room temperature annealing. The SiPMs are made with many different technologies, in particular different layouts, junction polarities, internal structures and starting materials. We studied the variation in the reverse current–voltage curves, distinguishing the effects on multiplied and not-multiplied current components, the primary dark count rate, the correlated noise probabilities and photon detection efficiency. Comparing all the measurement results, knowing the internal structure and the fabrication processes, we were able to extract and distinguish different deterioration mechanisms, also supported by TCAD simulations on the different effects of ionizing radiation inside the microcells
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