The Alpha Magnetic Spectrometer (AMS) is a general-purpose high-energy particle detector that was deployed to the International Space Station (ISS) on May 19, 2011 to perform a unique long-duration ...mission of fundamental physics research from space. Among the scientific goals of AMS are the search for Dark Matter and Antimatter, the study of the propagation of cosmic rays and the exploration of new scientific phenomena that cannot be achieved on ground-based experiments. After ten years of operation in space, AMS has collected more than 180 billion cosmic ray events and provided accurate measurements of electrons, positrons, protons, antiprotons, and nuclei with energies of several TeV during nearly a complete solar cycle.
The next generation magnetic spectrometer in space, AMS-100, is designed to have a geometrical acceptance of 100 m 2 sr and to be operated for at least ten years at the Sun–Earth Lagrange Point 2. ...Compared to existing experiments, it will improve the sensitivity for the observation of new phenomena in cosmic rays, and in particular in cosmic antimatter, by at least a factor of 1000. The magnet design is based on high temperature superconductor tapes, which allow the construction of a thin solenoid with a homogeneous magnetic field of 1 Tesla inside. The inner volume is instrumented with a silicon tracker reaching a maximum detectable rigidity of 100 TV and a calorimeter system that is 70 radiation lengths deep, equivalent to four nuclear interaction lengths, which extends the energy reach for cosmic-ray nuclei up to the PeV scale, i.e. beyond the cosmic-ray knee. Covering most of the sky continuously, AMS-100 will detect high-energy gamma-rays in the calorimeter system and by pair conversion in the thin solenoid, reconstructed with excellent angular resolution in the silicon tracker.
An initial measurement of the lifetime of the positive muon to a precision of 16 parts per million (ppm) has been performed with the FAST1 detector at the Paul Scherrer Institute. The result is ...τμ=2.197083(32)(15)μs, where the first error is statistical and the second is systematic. The muon lifetime determines the Fermi constant, GF=1.166352(9)×10−5GeV−2 (8 ppm).
Design and performance of the FAST detector Casella, C.; Barczyk, A.; Barone, G. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2013, Letnik:
700
Journal Article
Recenzirano
The Fibre Active Scintillator Target (FAST) experiment at the Paul Scherrer Institute (PSI) is designed for a high-precision measurement of the μ+ lifetime, in the order of a few parts per million. ...This paper describes the design, construction and performance of the FAST detector and its readout electronics, trigger and data acquisition system.
The Alpha Magnetic Spectrometer (AMS) experiment aboard the International Space Station has been collecting data since May 2011. The AMS silicon tracker accurately determines the trajectory of ...charged particles. Together with the magnet, it measures the rigidity (momentum per unit charge) of cosmic rays in the range from ∼0.5 GV to several TV. The precise knowledge of the rigidity scale is of critical importance to the physics goals of the experiment. The method to establish the tracker rigidity scale by using electron and positron events is presented. It allowed validation of the tracker alignment and estimation of the potential rigidity scale shifts. Using 5 years of AMS data, the tracker rigidity scale was measured with an accuracy of ±0.030(stat)±0.017(sys) TV−1, limited mostly by available positron statistics.
El monitoreo atmosférico es una de las etapas fundamentales en la identificación de estrategias para minimizar, prevenir y controlar los impactos de la dispersión de contaminantes en el aire, sobre ...la salud pública y el ambiente. Por tanto, el objetivo principal de este articulo consiste en proponer una metodología para la selección de sitios de monitoreo atmosférico en zonas urbanas afectadas por las emisiones de fuentes móviles. Primeramente se identificaron los sitios que presentaban mayor flujo vehicular y se priorizaron teniendo presente los siguientes criterios de selección: seguridad, influencia de otras fuentes, facilidad del montaje de los equipos, accesibilidad al sitio, identificación de barreras y obstáculos, registro histórico de datos y grado de concentración usando el software CALINE 3.La modelación agrupo datos característicos de las vías, meteorológicos y de flujo vehicular de un año típico de la zona en estudio. A cada uno de estos parámetros le es asignada una valoración cuantitativa, la cual define los sitios donde se realizará el monitoreo. Como resultados se desarrolló una guía para seleccionar los lugares en donde se puedan desarrollar campañas de monitoreo atmosférico asociadas a fuentes móviles. La metodología fue aplicada en la ciudad de Cartagena de Indias haciendo uso del modelo de calidad del aire CALINE3.
Atmospheric monitoring is one of the fundamental steps in identifying strategies to minimize, prevent and control the impact of the dispersion of pollutants in the air, on public health and the environment. Therefore, the main objective of this article is to propose a methodology for selecting air monitoring sites in urban areas affected by emissions from mobile sources. First, the places with the highest vehicular flow were identified and prioritized according to the following selection criteria: safety, influence of other sources, ease of assembly of equipment, accessibility to the site, identification of barriers and obstacles, historical record of data and degree concentration of the pollutant: in this case carbon monoxide, using CALINE 3 software. The modeling grouped characteristic data related with roads, meteorology and vehicular flow of a typical year of the zone under study. A quantitative assessment is assigned to each of these parameters, which defines the sites where the monitoring will be performed. As a result, it was developed a guide to select those places where atmospheric monitoring campaigns related with mobile sources can be held. This methodology was applied in the city of Cartagena de Indias by using air quality model for assessment, CALINE 3
The aim of this work was to determine the concordance between the counts obtained with the Makler and the Neubauer chambers in ejaculates from fertile men.
Cross sectional study in Reproduction ...Group, University of Antioquia, Medellin-Colombia.
112 ejaculates from fertile men were analyzed in the present study. Sperm count was determined using both chambers, the comparisons between chambers were determined using a Bland-Altman plot.
The means values for sperm count were 107.8 and 106.2 x 10(6) sperm/mL using the Makler and the Neubauer chamber, respectively, and there was concordance between both methods.
Our results show that the determination of sperm concentration with the Makler chamber is as accurate as with the Neubauer chamber and that either chamber can be used in routine semen analyses.
The second level trigger system of FAST Martínez, G.; Barcyzk, A.; Berdugo, J. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2009, Letnik:
609, Številka:
2
Journal Article
Recenzirano
The Fibre Active Scintillator Target (FAST) experiment is a novel imaging particle detector currently operating in a high-intensity π
+ beam at the Paul Scherrer Institute (PSI), Villigen, ...Switzerland. The detector is designed to perform a high precision measurement of the μ
+ lifetime, in order to determine the Fermi constant,
G
f, to 1
ppm precision. A dedicated second level (LV2) hardware trigger system has been developed for the experiment. It performs an online analysis of the π/μ decay chain by identifying the stopping position of each beam particle and detecting the subsequent appearance of the muon. The LV2 trigger then records the muon stop pixel and selectively triggers the Time-to-Digital Converters (TDCs) in the vicinity. A detailed description of the trigger system is presented in this paper.
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