The Time-of-Flight system for the PAMELA experiment in space Barbarino, G.; Boscherini, M.; Campana, D. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2008, Letnik:
584, Številka:
2
Journal Article
Recenzirano
The Time-of-Flight (ToF) system is one of the key elements of the a Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) apparatus, since it must generate the trigger for ...all the subdetectors and provide, alongside with the magnetic spectrometer, particle identification in the lower part of the explored energy spectrum. The ToF system will be described from the point of view of its geometrical design, its mechanics and its performances. In addition, since the extremely hostile space environment, several tests have been carried out in order to qualify the entire ToF system. The measured features and performance will be also described.
EUSO-SPB2 (Extreme Universe Space Observatory on a Super Pressure Balloon II) is a precursor mission for a future space observatory for multi-messenger astrophysics, planned to be launched in Spring ...2023 with a flight duration target of 100 days. The Fluorescence Telescope (FT) hosted on board is designed to detect Ultra High Energy Cosmic Rays via the UV fluorescence emission of the Extensive Air Showers in the atmosphere. The Data Processor (DP) of the FT is the component of the electronics system that performs data management and instrument control for the telescope. The DP controls front-end electronics, tags events with arrival time and payload position through a GPS system, provides signals for time synchronization of the event and measures the live and dead time of the telescope. Furthermore, it manages mass memory for data storage, performs housekeeping monitoring, and controls the power-on and power-off sequences. Finally, the data processor combines the data from the PDMs and onboard differential GPS and prioritizes data for download. The long duration of the flight poses strict requirements on electronics and data handling. The operations at high altitude in an unpressurized environment represent a technological challenge for heat dissipation. This contribution will provide an overview of the innovative elements developed and the results of the integration and field test campaigns. We will also present some preliminary analysis of the performance during the flight.
Cladospirone bisepoxide (1), a novel metabolite, was isolated from cultures of a fungus which was characterized as a coelomycete by the formation of pycnidia. By optimization of media and ...fermentation conditions, a titer of up to 1.5g/liter on shake level and 1.16g/liter on bioreactor scale could be achieved. The isolation of the compound was performed by solvent extraction of the culture broth and subsequent crystallization. Cladospirone bisepoxide displays selective antibiotic activity against several bacteria and fungi and inhibits germination of Lepidium sativum at low concentrations.
The BAM project was conceived to face the problems of the brick construction of the OPERA detector target. An OPERA brick is made of a pile (interleaved lead and nuclear emulsion sheets), kept under ...a pressure of 3 bar. The brick must be a precise object (dimensional tolerance: ± 0.1 mm), weighting about 8.5 kg, which must be stable at micrometric level for 5 years (OPERA data taking time). The main purpose of the BAM project was to assembly 150.000 bricks in the planned time of one year. It was mandatory to keep bricks shielded from cosmic radiations and there was no way to store them out of the OPERA detector. Thereby it was decided to design an automatic machine for brick assembling, to place it close to the OPERA experiment (inside the underground laboratories of LNGS). Once defined the assembly technique, several technical problems were faced concerning the manipulation of both brick components and assembled bricks. The very challenging goal was due to the synergy of several technical difficulties to be solved in parallel: work in dark and clean room, micrometric precision, handling of heavy and fragile components, high level reproducibility, high production speed and long term stability. The use of anthropomorphic robots was the key choice to solve most of them. In fact those robots show outstanding feature of flexibility and reproducibility in positioning components in the space. Additional PLC and image processing controls were conceived to secure the demanded on line quality control of the production process. The BAM is equipped with 11 anthropomorphic robots and represents today the first application of this industrial technique in the particle physics research field. This approach can become a relevant solution for all future mass productions in the construction of components for future large size detectors in particle physic research. The final average production rate of 750 bricks/day was achieved. The BAM stopped the OPERA brick mass production in June 2008 at 146600 bricks produced, due to lack of lead caused by a severe accident in the lead supplier firm. The remaining 3400 bricks are planned to be produced, as soon as lead components will be available again.
Management control in public university hospitals is a challenging task because of continuous changes due to external pressures (e.g. economic pressures, stakeholder focuses and scientific progress) ...and internal complexities (top management turnover, shared leadership, technological evolution, and researcher oriented mission). Interactive budgeting contributed to improving vertical and horizontal communication between hospital and stakeholders and between different organizational levels. This paper describes an application of Analytic Hierarchy Process (AHP) to enhance interactive budgeting in one of the biggest public university hospital in Italy. AHP improved budget allocation facilitating elicitation and formalization of units' needs. Furthermore, AHP facilitated vertical communication among manager and stakeholders, as it allowed multilevel hierarchical representation of hospital needs, and horizontal communication among staff of the same hospital, as it allowed units' need prioritization and standardization, with a scientific multi-criteria approach, without using complex mathematics. Finally, AHP allowed traceability of a complex decision making processes (as budget allocation), this aspect being of paramount importance in public sectors, where managers are called to respond to many different stakeholders about their choices.
R&D results from the NOE scintillating fiber calorimeter Alexandrov, K.V.; Barbarino, G.C.; Bernardini, P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2001, Letnik:
459, Številka:
1
Journal Article
Recenzirano
The development of the
NOE calorimeter, based on scintillating fiber technology, has undergone four years of intense R&D activity. Measurements of light attenuation and time resolution have been ...carried out on a variety of commercially available scintillating fibers. Both these parameters are important for the optimization of the design of the
NOE calorimeter. Experimental results on the fiber attenuation length and light yield make us confident on the possibility to build a
8×8
m
2
cross-section calorimeter without noticeable loss of signal. The time resolution is resulted to be of the order of 1
ns, sufficient for up/down discrimination in the final calorimeter setup, by means of the time-of-flight method. Several tests performed to optimize the elementary cell of the calorimeter are also described.
Medical Imaging applications use images coming from different sources such as magnetic resonance imaging (MRI), computer tomography (CT), positron emission tomography (PET), to generate 3D data. ...Starting from these volumetric data, applications reconstruct 3D models of anatomical structures which could be manipulated and analyzed. In this paper we present a new approach for the visualization and interaction with volumetric datasets in a fully immersive environment. It allows to handle the reconstructed models directly within the virtual scene; in particular a technique is described for outlining the Volume Of Interest (VOI) functionality in a three-dimensional dataset for a visual interactive inspection and manipulation of the organ of interest.
The NOE scintillating fiber calorimeter prototype test results Alexandrov, K.V; Barbarino, G.C; Bernardini, P ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2001, 2001-1-00, Letnik:
456, Številka:
3
Journal Article
Recenzirano
An intense R&D program has been carried out by the NOE Collaboration during the last years, to develop a massive fine grain scintillating fiber calorimeter, to be used, in combination with an ...appropriate target, in a Long Base Line experiment at the CERN to Gran Sasso (CNGS) neutrino beam. The performance of a 4 ton
NOE calorimeter prototype exposed to a test beam at CERN PS is shown. Results on the linearity, electromagnetic and hadronic energy resolution are reported and compared with the Monte Carlo predictions.
The
NOE Collaboration has proposed a transition radiation detector (TRD) interleaved with marble targets to tag the electron decay channel of τ leptons produced by ν
τ, eventually originated by ν
μ ...oscillations in a long base line experiment. A reduced scale TRD detector prototype has been built and exposed to an electron/pion beam at the CERN PS. Discrimination capabilities between electrons and both charged and neutral pions, representing the main source of background for our measurement, have been determined obtaining rejection factors of the order of the tenth of percent for charged pions, and of a few percent for the neutral pion, matching the experiment requirements. The capabilities of this detector to measure the energy released by particles that start showering inside the targets are shown. A momentum resolution
σ
p
/
p≤40% is found for muons in the range of 1–
7
GeV/c
.
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