This paper presents the Monte-Carlo simulation of charged particles motion in aluminum film of several tens micrometers thickness, which is a sensor part of a strip-detector. It was considered that secondary electrons are generated by copper ions Cu++ with energy 5 - 25 keV. An elastic collisions with target atoms, atomic levels ionization and electron capture have been taken into account for the ions, and for the secondary electrons – elastic collisions with target atoms, atomic levels ionization, plasmons and phonons generation. The derived dependence of the charge accumulated by sensor on ion beam energy is matching experimental data.
Anahtar Kelimeler :
ion beams, thin films, secondary electron emission, metal strip-detector, modeling
Cilt: 13 Sayı: 2 Sayfa: 146 - 152
Inclusive cross section for the production of Λ - and Λ -hyperons in proton-nucleus interactions at 920 GeV on carbon, titanium and tungsten targets are investigated. Differential cross sections as a function of Feynman-x ( F x ) and transverse momentum square ( 2 t p ) were studied. The atomic mass number (A) dependence of total production cross sections in negative F x region ( 0,12 0 F − << x ) are presented.
The LHCb experiment at the Large Hadron Collider (LHC) is dedicated to studies of rare phenomena in -and decays in order to precisely constrain the Standard Model parameters and search for beyond Standard Model signatures. The LHCb detector is fully installed and commissioned; first data from pp collisions are being experienced. Physics performance of the LHCb experiment in constraining Standard Model parameters is illustrated with the expected reach on the CKM angle measurements, mixing phases and the angle of unitarity triangle. New physics search in the b-sector is discussed at the examples of rare decays and , as well as photon helicity studies in the mode. Radiation level measurement for the silicon inner tracker operation and beam condition monitoring with the Radiation Monitoring System, developed at Kiev Institute for Nuclear Research, are discussed.
The double-sided silicon microstrip detector prototypes with 50 μm pitch developed together with CiS, Germany, have been characterized in a 2.4 GeV/c proton beam at COSY, Forschungszentrum Jülich, Germany. Data analyses including reconstruction of 1-strip and 2-strip clusters have been performed. We have done the study of charge sharing in the interstrip gap. In particular it was found that there is a charge loss of less than 10 % in the interstrip gap. The calculated signal-to-noise ratio is around 19 for the p-side of the sensor and it is sufficient for hit reconstruction. Also the charge sharing function which allows more precise determination of the hit position in silicon sensor, have been reconstructed.
Design of STS and module prototype of silicon micro-strip detector for particle momenta measurements with a resolution of around Δp/p ≈ 1 % are presented. Very high radiation level and inhomogeneous track distribution result in modular construction of the detector stations. The micro-strip detectors are planned to be read out with the help of СВМ-XYTER chip. The system requirements include radiation tolerant sensors with high spatial resolution and a fast readout compatible with high-level-only triggers. Concept of the silicon detection system and the R&D on micro-strip sensors as well as front-end electronics for the building blocks of the detector stations are discussed.
Elements of the technology are presented for the production of Microсtrip Metal Detectors (MSMD) designed for the charged particles beam as well as synchrotron radiation monitoring. Problems emerged for the photolithography as well as chemical etching applied to the supporting silicon wafer. Taking into account the acquired experience it was possible to produce stable MMSD plates with 32 strips (thickness 1 µм, width 30 µм, pitch 70 µм) at the working area of (10 × 10) mm2 , created by the plasma-chemistry etching of the silicon wafer. The MSMD prototypes produced under the developed technology were successfully tested in the scientific centre DESY (Hamburg).
Characteristics of 512-channel micro-detection system for the study of fast processes in metals during heating/cooling at high-speed radiography installation was presented. The position, width and intensity of diffraction peaks of the scattered X-rays was measured and displayed in real time depending on the temperature of the test sample (20 - 1500 °C). The position sensitivity of the system based on silicon microstrip sensors read out by commercial XDAS data acquisition system is 40 μm for the scattering angle of X-rays 30° < Θ < 75°.
Anahtar Kelimeler :
X-rays diffraction, position sensitive detectors, transient phase transformations, temperature dependence of phase transformations in metals, microstrip silicon detectors
Cilt: 17 Sayı: 4 Sayfa: 400 - 405
The results for the test of a TimePix hybrid detector as a tool for measuring and imaging in real time dynamics of phase transitions in metal alloys under heating or cooling are presented. The X-rays ( ~ 10 keV) experimental setup explored for the diffraction studies at the Institute for Problems of Material Science NASU (Kyiv) is briefly described. An evolution of the diffraction maxima position (~ 20 μm accuracy) of the scattered X-rays was ob-served with exposures from a few dozen to a few hundred milliseconds under heating or cooling of the samples of Armco iron at a rate of 100 to 250 C/s. Data for the phase transitions (alpha-, gamma-phases observed) during heating/cooling (20 - 1250 °C) using the X-ray diffraction were measured.