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Browsing by Author "Wolters, H."

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  • Examples of shared ATLAS Tier2 and Tier3 facilities
    Publication . Gonzalez de la Hoz, S.; Villaplana, M.; Kemp, Y.; Wolters, H.; Severini, H.; Bhimji, W.
    In this contribution, the model of shared ATLAS Tier-2 and Tier-3 facilities is explained. Data taking in ATLAS has been going on for more than two years. The Tier-2 and Tier-3 facility setup, how do we get the data, how do we enable at the same time Grid and local data access, how Tier-2 and Tier-3 activities affect the cluster differently and process of hundreds of millions of events, are described. Finally, an example of how a real physics analysis is working at these sites is shown, and this is a good occasion to see if we have developed all the Grid tools necessary for the ATLAS Distributed Computing community, and in case we do not, to try to fix it, in order to be ready for the foreseen increase in ATLAS activity in the next years.
    2012Journal article Unknown Show more
  • Lessons learned from the ATLAS performance studies of the Iberian Cloud for the first LHC running period
    Publication . Sanchez-Martinez, V.; Borges, G.; Borrego, C.; Peso, J.del; Delfino, M.; Gomes, J.; Gonzales de la Hoz, S.; Pacheco Pages, A.; Salt, J.; Sedov, A.; Villaplana, M.; Wolters, H.
    In this contribution we describe the performance of the Iberian (Spain and Portugal) ATLAS cloud during the first LHC running period (March 2010-January 2013) in the context of the GRID Computing and Data Distribution Model. The evolution of the resources for CPU, disk and tape in the Iberian Tier-1 and Tier-2s is summarized. The data distribution over all ATLAS destinations is shown, focusing on the number of files transferred and the size of the data. The status and distribution of simulation and analysis jobs within the cloud are discussed. The Distributed Analysis tools used to perform physics analysis are explained as well. Cloud performance in terms of the availability and reliability of its sites is discussed. The effect of the changes in the ATLAS Computing Model on the cloud is analyzed. Finally, the readiness of the Iberian Cloud towards the first Long Shutdown (LS1) is evaluated and an outline of the foreseen actions to take in the coming years is given. The shutdown will be a good opportunity to improve and evolve the ATLAS Distributed Computing system to prepare for the future challenges of the LHC operation.
    2014Journal article Open access Show more
  • MARTA: a high-energy cosmic-ray detector concept for high-accuracy muon measurement
    Publication . Abreu, P. et al. (45 authors); Andringa, S.; Assis, P.; Blanco, A.; Brogueira, P; Carolino, N.; Cazon, L.; Conceição, R.; Cunha, O; Diogo, F.; Espadanal, J.; Ferreira, M.; Ferreira, P.; Fonte, P.; Gonçalves, P.; Lopes, L.; Mendes, L.; Pereira, A.; Pimenta, M.; Sarmento, R.; Tomé, B.; Wolters, H.
    A new concept for the direct measurement of muons in air showers is presented. The concept is based on resistive plate chambers (RPCs), which can directly measure muons with very good space and time resolution. The muon detector is shielded by placing it under another detector able to absorb and measure the electromagnetic component of the showers such as a water-Cherenkov detector, commonly used in air shower arrays. The combination of the two detectors in a single, compact detector unit provides a unique measurement that opens rich possibilities in the study of air showers.
    2018-04-24Journal article Open access Show more