General
Site

Atlas Data Challenges

Introduction

• About two years ago ATLAS computing planned  first series of Data Challenges in order to validate its Computing Model, its software, its data model, and to ensure the correctness of the technical choices to be made. Since then, and particulary in the context of the CERN Review of LHC Computing, the scope and goals of these data challenges has evolved. It is now clear that these Data Challenges should be executed at the prototype Tier centres wich will be built in the Phase1 of the LHC Computing Grid Project.

           All the Data Chalenges will be run on Linux systems operating at close to the          CERN certified level.

• Data Challenge 0: To simulate and reconstruct samples of the order of 100k "Z+jet" events, or similar. In order to test the database technology, Objectivity, the simulated data will be converted to Objectivity before the reconstruction step.

• Data Challenge 1: It will be to divided in to phases. In the first phase they will generate several data sets, some large as 10⁷ events. The second phase will also produce some physics samples but will be more oriented to the thesting of the new software, including Geant4, the new event data model and the evaluation of two databases technologies, Objectivity and Root-I/O. The volume of data to be generated should be of the order of 20-30 TB.

• Data Challenge 2: Samples of 10⁸ events will be generated, mainly in OO-databases, and with large-scale physics analysis using Grid tools.

• We want to participate in this year in the Data Challenge 1(DC1) with two goals.
• Event productions in our farm in order to provide samples for physics studies and make the Technical Design Report for the end of 2002.
• To test in our farm the new software, including Geant4, the new event data model and the evaluation of two database technologies, Objectivity and Root-I/O.
• In the Future we want to partcipate in the Data Challenge 2 (DC2). The details of DC2 will depend on what has and has not been achieved in DC0/1. The goals are the following.
• Geant 4 simulation should play a major role in this DC,
• extensive use of the GRID middleware,
• calibration and alignment procedures should be tested.

• Jornadas de Grupos Técnicos RedIRIS (Madrid, June 2002)
• Presentation in .ppt format