ATLAS (A Toroidal LHC ApparatuS) – the world’s largest scientific installation of high-energy physics.
The experiment is carried out on the same-named detector, designed to study proton-proton and ion-ion collisions with an energy of 14 TeV.
The main goal of the ATLAS experiment is to clarify or refute the standard model
Theoretical construction in physics, describing elementary particles and three of the four fundamental interactions (with the exception of gravitational): strong, weak and electromagnetic.
The ATLAS experiment at the Large Hadron Collider (LHC) began work in November 2009 at the European Organization for Nuclear Research (CERN) in Geneva.
Data processing includes the :
- reconstruction of events in the detector,
- statistical modeling and
- analysis.
In accordance with the model of experimental data processing, it is envisaged to use geographically distributed computing resources.
To organize the work of the computing centers included in the AT ATLAS, a three-level grid infrastructure is used.
The Computing Center of JINR is a part of the Russian joint center ATLAS of the 2nd level: Tier-2 RuTier2
The CICC of JINR provides computational resources for analysis and statistical modeling and provides storage of experimental data ATLAS.
ATLAS at the CICC of JINR includes tools for:
- Installation of the software experiment,
- Data management system, and
- Tools for managing the tasks of statistical modeling and
- distributed data analysis.
The ATLAS data management system (DDM) provides automatic data copying between JINR and the SARA level 1 center (Amsterdam, The Netherlands), and
JINR junctions and other centers of the 2nd level located in Russia, Israel, Turkey and Ireland, and associated with Tier-1 SARA.
In addition, if necessary, the data management system allows data to be transferred to/from any other sites included at VO ATLAS.
The launch and management of statistical modeling tasks at ATLAS in JINR takes place centrally from CERN.
The status and results of the tasks are constantly monitored and published on the page of the ATLAS task management system: http://bigpanda.cern.ch/
The data obtained during the simulation is transferred to Tier-1 SARA for storage.
The launching and management of distributed analysis tasks is carried out with the help of Two auxiliary programs – GANGA and pathena.
To monitor the reliability of Tier2 JINR, automatic testing of the functionality of the grid segment. These include tests of the
- data transmission system, and
- stress tests of the distributed data analysis system.
Regularly on the site T2_RU_JINR, a typical launch of standard ATLAS tasks is performed using the
HammerCloud test system :
Http://hammercloud.cern.ch/hc/app/atlas/