422 research outputs found
Silicon Avalanche Pixel Sensor for High Precision Tracking
The development of an innovative position sensitive pixelated sensor to
detect and measure with high precision the coordinates of the ionizing
particles is proposed. The silicon avalanche pixel sensors (APiX) is based on
the vertical integration of avalanche pixels connected in pairs and operated in
coincidence in fully digital mode and with the processing electronics embedded
on the chip. The APiX sensor addresses the need to minimize the material budget
and related multiple scattering effects in tracking systems requiring a high
spatial resolution in the presence of a large occupancy. The expected operation
of the new sensor features: low noise, low power consumption and suitable
radiation tolerance. The APiX device provides on-chip digital information on
the position of the coordinate of the impinging charged particle and can be
seen as the building block of a modular system of pixelated arrays,
implementing a sparsified readout. The technological challenges are the 3D
integration of the device under CMOS processes and integration of processing
electronics.Comment: 13th Topical Seminar on Innovative Particle and Radiation Detectors
IPRD1
A Wireless, Battery-Powered Probe Based on a Dual-Tier CMOS SPAD Array for Charged Particle Sensing
A compact probe for charged particle imaging, with potential applications in source activity mapping and radio-guided surgery was designed and tested. The development of this technology holds significant implications for medical imaging, offering healthcare professionals accurate and efficient tools for diagnoses and treatments. To fulfill the portability requirements of these applications, the probe was designed for battery operation and wireless communication with a PC. The core sensor is a dual-layer CMOS SPAD detector, fabricated using 150 nm technology, which uses overlapping cells to produce a coincidence signal and reduce the dark count rate (DCR). The sensor is managed and interfaced with a microcontroller, and custom firmware was developed to facilitate communication with the sensor. The performance of the probe was evaluated by characterizing the on-board SPAD detector in terms of the DCR, and the results were consistent with the characterization measurements taken on the same chip samples using a purposely developed benchtop setup
Beam test calibration of the balloon-borne imaging calorimeter for the CREAM experiment
CREAM (Cosmic Ray Energetics And Mass) is a multi-flight balloon mission
designed to collect direct data on the elemental composition and individual
energy spectra of cosmic rays. Two instrument suites have been built to be
flown alternately on a yearly base. The tungsten/Sci-Fi imaging calorimeter for
the second flight, scheduled for December 2005, was calibrated with electron
and proton beams at CERN. A calibration procedure based on the study of the
longitudinal shower profile is described and preliminary results of the beam
test are presented.Comment: 4 pages, 4 figures. To be published in the Proceedings of 29th
International Cosmic Ray Conference (ICRC 2005), Pune, India, August 3-10,
200
The MEG detector for decay search
The MEG (Mu to Electron Gamma) experiment has been running at the Paul
Scherrer Institut (PSI), Switzerland since 2008 to search for the decay \meg\
by using one of the most intense continuous beams in the world. This
paper presents the MEG components: the positron spectrometer, including a thin
target, a superconducting magnet, a set of drift chambers for measuring the
muon decay vertex and the positron momentum, a timing counter for measuring the
positron time, and a liquid xenon detector for measuring the photon energy,
position and time. The trigger system, the read-out electronics and the data
acquisition system are also presented in detail. The paper is completed with a
description of the equipment and techniques developed for the calibration in
time and energy and the simulation of the whole apparatus.Comment: 59 pages, 90 figure
The GINGER Project
GINGER (Gyroscopes IN General Relativity) is a project aiming at measuring the Lense-Thirring effect, at 1% level, with an experiment on earth. It is based on an array of ring-lasers, which are the most sensitive inertial sensors to measure the rotation rate of the Earth. The GINGER project is still under discussion; the experiment G-GranSasso is an R&D experiment financed by INFN Group II, it is studying the key points of GINGER and at the same time developing prototypes. In the following the signal coming out of a ring-laser and the present sensitivity are described.The prototypes GP2 and GINGERino and the preliminary results are reported. This project is inter-disciplinary since ring-lasers provide informations for the fast variation of the earth rotation rate, they are used for the rotational seismology and for top sensitivity angle metrology
Теоретичне прогнозування критичних станів вертикальних колон надглибинного буріння
Поставлена задача об устойчивости и свободных колебаниях глубоких вращающихся бурильных
колонн, которые преднапряжены продольной силой
и крутящим моментом. С учетом статических и
динамических эффектов силового взаимодействия
указанных механических факторов построены разрешающие уравнения. Предложена методика их
решения, основанная на применении метода продолжения по параметру и метода ортогонализации.
Выполнены исследования устойчивости и колебаний
бурильных колонн длиной до 10000 мThe problem about free vibrations of rotating drill
columns prestressed by torque and longitudinal force is
stated. The constitutive equations are formulated with
allowance made for static and dynamic effects of force
interaction betwen the mentioned factors. The
techniques of the equation integration are proposed,
wich are based on application of the transfer matrix
method and the orthogonalization method. The
investigations of stability and vibrations of the 10 km
length drill strings are performed
Operation and performance of the MEG II detector
The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is the successor to the MEG experiment, which completed data taking in 2013. MEG II started fully operational data taking in 2021, with the goal of improving the sensitivity of the mu+-> e+gamma\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\upmu <^>+ \rightarrow {\textrm{e}}<^>+ \upgamma \end{document} decay down to similar to 6x10-14\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\sim 6 \times 10<^>{-14}\end{document} almost an order of magnitude better than the current limit. In this paper, we describe the operation and performance of the experiment and give a new estimate of its sensitivity versus data acquisition time
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