DSpace Collection:

In-Situ Determination of the Performance of the Muon Spectrometer

2008-12-31T23:00:00Z

In-Situ Determination of the Performance of the Muon Spectrometer Diglio, Sara; Orestano, Domizia; Petrucci, Fabrizio; Spogli, Luca 2009 Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics 208-228 The ATLAS muon spectrometer consists of three layers of precision drift-tube chambers in a toroidal magnetic with a field integral between 2.5 and 6 Tm. Muon tracks are reconstructed with 97% efficiency and a momentum resolution between 3% and 4% for 10 GeV< pT <500 GeV and better than 10% for transverse momenta up to 1 TeV. In this note, the performance of a perfectly calibrated and aligned muon spectrometer will be reviewed and the impact of deteriorations of the magnetic field, the calibration and misalignment of the muon chambers on the performance will be discussed. The main part of the note describes how the performance of the muon spectrometer can be determined using dimuon decays of Z bosons and JPsi mesons

TELLUS experiment. A new electromagnetic strainmeter for the monitoring of ground-field deformations.

2009-05-31T22:00:00Z

TELLUS experiment. A new electromagnetic strainmeter for the monitoring of ground-field deformations. Sgrigna, Vittorio; Conti, Livio; Zilpimiani, David 2009-06 Laboratori Nazionali del Gran Sasso, INFN, Annual Report 2008 187-193 An original differential electromagnetic strainmeter has been made for wide base-length and high-resolution ground-based continuous measurements of deformation processes. The equipment consists of a couple of central and peripheral units located at a sight distance relatively to each other. Each unit includes an antenna, an electronic package, and the power supply system. The central Unit is linked to a computer through an analog-to-digital converter. The equipment has been designed, built, assembled and calibrated in the ESPERIA Laboratory of the Department of Physics of the Roma Tre University. It can process, transfer and store data to a mass memory unit.

Earthquake preparation and warning: science, methods and technologies

2010-07-16T12:45:12Z

Earthquake preparation and warning: science, methods and technologies Sgrigna, Vittorio; Conti, Livio 2010-07-16T12:45:12Z Advances in Environmental Research, Volume 7 38 The paper aims at giving suggestions for a deterministic approach to earthquake warning based on combined ground and space observations of earthquake precursors and related theoretical modeling. On the occasion of a destructive earthquake often a strong debate arises between administrators, engineers, specialists in applied geophysics and seismology, technicians of local and civil services, and authorities that need to take adequate measures for assistance and protection of the population and reconstruction of houses and infrastructures. But on the same occasion also a question about a possible prediction of the event and prevention damage arises in the people and scientists, which of course, can not receive any exhaustive answer. Under the emotional stress of people involved in the disaster, often there are also misleading overlapping proposals and procedures, misdirections and not constructive solutions. A possible contribution to earthquake warning and prediction may be given by observations and physical modeling of earthquake precursors aim at seeing in perspective the phenomenon earthquake within the framework of a unified theory able to explain the causes of its genesis, and the dynamics, rheology, and microphysics of its preparation, occurrence, post-seismic relaxation, and inter-seismic phases. Unfortunately, up to now what is lacking is the demonstration of a causal relationship (with explained physical processes and looking for a correlation) between data gathered simultaneously and continuously by space observations and ground-based measurements. In doing this, modern and/or new methods and technologies have to be adopted to try to solve the problem. Coordinated space and ground-based observations imply available test sites on the Earth surface to correlate ground data, collected by appropriate networks of instruments, with space ones detected on board of Low-Earth-Orbit (LEO) satellites. Moreover, a new strong theoretical scientific effort is necessary to try to understand the physics of earthquake(s). Within this framework a few projects and experiments have been carried out on the subject by our team and accompanied by specific theoretical interpretations. They are reported in the paper. As an introduction and justification to these studies the paper also clarifies some basic concepts, critical and methodological aspects concerning deterministic and statistic approaches, and their use in earthquake prediction and warning.