[en] Complex software for shower reconstruction in DELPHI barrel electromagnetic calorimeter which deals, for each event, with great amounts of information, due to the high spatial resolution of this detector, needs powerful verification tools. An interactive graphics program, running on high performance graphics display system Whizzard 7555 from Megatek, was developed to display the logical steps in showers and their axes reconstruction. The program allows both operations on the image in real-time (rotation, translation and zoom) and the use of non-geometrical criteria to modify it (as the use of energy) thresholds for the representation of the elements that compound the showers (or of the associated lego plots). For this purpose graphics objects associated to user parameters were defined. Instancing and modelling features of the native graphics library were extensively used

[en] ARGO-YBJ, a Chinese-Italian collaboration, is going to finish the first step of the installation of this cosmic ray telescope consisting in a single layer of RPCs, placed at 4300 m, elevation, in Tibet. The detector will provide a detailed space-time picture of the showers front, initiated by primaries of energies in the range 10 GeV-500 TeV. The data taking will start at the beginning of 2002 with a fraction of the detector installed, will be upgraded two times, being completed at the end of 2003. The authors briefly describe the data flow, the trigger organization, the three operational steps in data taking and the computing model to process the data. The need of remote monitoring of the experiment will be touched upon. The processing power for the raw data reconstruction and for the Monte Carlo simulation is reported

[en] A model of the polaron motion by thermally assisted tunneling is proposed. The results are also reported of a computer analysis of the probability of the combined hoppingg assuming a uniform distribution of the polaron energy states. (autr)

[en] Examining lousely coupled parallel solutions as computing resource we found Local Area VAXcluster suitable for building a production Farm. We transformed, tuning LAVc parameters, a general purpose computing environment in a specialized one, optimized for the production needs. To face the higher complexity introduced by the subdivision of the production between several computers, we developed a central software structure that surveys the functioning of the farm, informs and interfaces the users, automatically closes productions, saves bookeeping information and reports errors. For this we needed an efficient process-to-process communication mechanism, that we found to be an innovative use of some Lock Management system features

[en] The ARGO-YBJ experiment is reaching its final design configuration. An array of single layer Resistive Plate Counters (RPCs) covering an area of ∼5800m² will collect a huge amount of data. The throughput required from the final detector strongly depends on the trigger rate. The DAQ system must be able to sustain a data transfer rate estimated to be the order of 15MB/s and a high peak of data flow. Data are read out using a typical front-end acquisition chain built around a custom bus. Specialized electronics have been designed and efficient software had to be written to perform this task. Data are then sent to the on-line farm through a switch exploiting gigabit-ethernet protocol. In this paper we will describe the design of the DAQ system, the software which deals with data collection and network sending and the performances. The architecture of the on-line farm is also described together with the monitoring system

[en] An RPC carpet covering ∼ 10⁴ m² (ARGO-YBJ experiment) will be installed in the YangBaJing Laboratory (Tibet, P.R. China) at an altitude of 4300 m a.s.l.. A test-module of ∼ 50 m² has been put in operation in this laboratory and about 10⁶ air shower events have been collected. The carpet capability of reconstructing the shower features is presented

[en] The Data Acquisition system for the KLOE experiment, presently running at the Laboratori Nazionali di Frascati DAPHINE collider, has been designed to sustain an acquisition throughput of 50 Mbyte/s for an event rate of 10 kHz. Its two major components are the front end data readout, based on custom buses, and a complex network of computers and storage devices hosting a set of distributed processes. The end result is a seamless data transport from the readout system to the storage library, accompanied by concurrent on line calibrations and data quality control

[en] Bakelite RPCs, assembled according to the ARGO design, have been operated in the high altitude Laboratory of YBJ using dedicated electronics to pick-up the streamer signal. Here we report on the results concerning absorbed current, single counting rate, efficiency and time resolution. Environmental data concerning the operating temperature inside the ARGO experimental hall are also reported

[en] A 50 m² RPC carpet was operated at the YanBaJin Cosmic Ray Laboratory (Tibet) located 4300 m a.s.l. The performance of RPCs in detecting Extensive Air Showers was studied. Efficiency and time-resolution measurements at the pressure and temperature conditions typical of high mountain laboratories, are reported

[en] We present an overview of the strategy for Event Selection at the ATLAS High Level Trigger and describe the architecture and main components of the software developed for this purpose