Thomas Paul (Northeastern University)
The Pierre Auger Observatory aims to discover the nature and origins of the highest energy cosmic rays. The large number of physicists involved in the project and the diversity of simulation and reconstruction tasks pose a challenge for the offline analysis software, not unlike the challenges confronting software for very large high energy physics experiments. Previously we have reported on the design and implementation of a general purpose but relatively lightweight framework which allows collaborators to contribute algorithms and sequencing instructions to build up the variety of applications they require. In this report, we update the status of this work and describe some of the successes and difficulties encountered over the last few years of use. We explain the machinery used to manage user contributions, to organize the abundance of configuration files, to facilitate multi-format file handling, and to provide access to event and time-dependent detector information residing in various data sources. We also describe the testing procedures used to help maintain stability of the code in the face of a large number of contributions. Foundation classes will also be discussed, including a novel geometry package which allows manipulation of abstract geometrical objects independent of coordinate system choice.
Darko Veberic (University of Nova Gorica) Javier Gonalez (Louisiana State University) Julio Bahilo (University of Granada) Luis Prado, Jr. (Universidade Estadual de Campinas) Lukas Nellen (Universidad Nacional Autonoma de Mexico) Markus Roth (Karlsruhe Institute of Technology) Michael Unger (Karlsruhe Institute of Technology) Ralf Ulrich (Karlsruhe Institute of Technology) Sergio Barroso (Centro Brasileiro de Pesquisas Fisicas) Stefano Argiro (INFN and University of Torino) Thomas McCauley (Northeastern University) Thomas Paul (Northeastern University) Troy Porter (University of California, Santa Cruz)