1. September 16, 2005VI DOSAR – IFUSP/IFT – Philippe Gouffon Auger Project Computing Needs The Pierre Auger Observatory Auger data and processing Auger data collection and storage Rates and needs Conclusion

2. September 16, 2005VI DOSAR – IFUSP/IFT – Philippe Gouffon The Pierre Auger Observatory Auger is a “Ultra High Energy Cosmic Ray” experiment (for E CR >10 18 eV) 2 sites, to cover the whole sky: –South (Malargüe, Argentina) to be completed in 2006 –North (Colorado, USA), being designed Uses 2 types of detectors to measure the extended air showers. –Čerenkov water tanks ( ,  and electrons density and direction) –atmospheric fluorescence telescopes (track the core)

3. September 16, 2005VI DOSAR – IFUSP/IFT – Philippe Gouffon Surface Detector Fuorescence Detector

4. September 16, 2005VI DOSAR – IFUSP/IFT – Philippe Gouffon Current situation Only the Southern site exists. In August, –800 out of 1600 tanks are taking data –18 out of 24 telecopes are taking data Will be completed in 2006 –This talk addresses South only Northern site? Southern site, July 2005 Each dot is a tank, 1.5km apart. The 4 eyes are shown

5. September 16, 2005VI DOSAR – IFUSP/IFT – Philippe Gouffon Auger data types The events are stored in root format. The sources are: –Surface Detector (SD): (FADC traces, time, calibration, monitoring) –Fluorescence Detector: (FADC, time, monitoring) –Atmosphere characterization and monitoring (Lidar, wind, temperature, etc...)

6. September 16, 2005VI DOSAR – IFUSP/IFT – Philippe Gouffon Auger data collection, processing and storage SD and FD data are sent to a local central facility (CDAS) where the root files are created and stored The files are transferred to Lyon, France, where the events are analyzed and sorted according to certain requirements. In particular the so called hybrid events (SD & FD) are kept aside Auger members can process data at Lyon or copy events to their home institution or laptop.

7. September 16, 2005VI DOSAR – IFUSP/IFT – Philippe Gouffon Rates and needs The values presented here are based on August and September (800 tanks, 18 telescopes). SD raw data: 174kB/day/tank – for 1600 tanks : 280MB/day or 102GB/year FD raw data: 175MB/night/eye –For 4 eyes (24 tel.): 143GB/year Processed data –For 1600 tanks, 4 eyes: ~500GB/year Monitoring: –SD=144GB/y, Atmosphere 80MB/y Total: 890 GB/year

8. September 16, 2005VI DOSAR – IFUSP/IFT – Philippe Gouffon Conclusion Auger has a modest data storage need compared with current and future experiments. We still use MB and GB! However, Auger will run for 20, may be 30 years Probably the current values are overestimated. The events that everyone is looking at fit in a laptop Forgot to mention Monte Carlo data. It is now much less than real data, about 80GB.