Auger FB review, Malargüe, October 2001. DPA – R. Shellard & S. J. Sciutto1 PIERRE AUGER...
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Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 1
PIERRE AUGER OBSERVATORYFinance Board Review
Data Processing and Analysis
Malargüe, October 27-29, 2001
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 2
Data Processing and Analysis
Outline
• Introduction • DPA activities
– Shower and detector simulations– Physics reconstruction from detector output– Analysis and visualisation tools– Data management and Storage– Software distribution system– Networking
• Plans for the future and conclusions
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 3
Motivation
• Provide the environment and tools to make sense of the data taken by the Pierre Auger Observatory
• Provide the tools to allow physicists retrieve and analyse the Auger data.
• Transfer and store permanently the Auger data in Data Centers in an organized way.
• Test and optimize the physics algorithms within codes.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 4
Background
• The Auger software is built by physicists coming from a broad background.
• It is built on top of software coming from a pool of many previous experiments.
• Has to be prepared to evolve, adapt and live for the long term of the experiment and be maintainable.
• Software is to be helpful and not a burden to physicists doing analysis.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 6
The Simulation-Reconstruction chain
TriggerSimulation(SD, FD,Hybrid)
Reconstruction(SD, FD,Hybrid)
CDAS ReconstructedObservables
Simulateddata
Shower Simulation
SD simulation
FDSimulation
AtmosphereSimulation
Particlesampling
Realdata
Shower parametersEnvironment parametersDetector description
Input
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 7
Shower simulations
• The Auger Collaboration uses two simulation codes: AIRES and CORSIKA.
• Both codes produces full space-time propagation of particles within the Earth’s atmosphere.
• They are linked to several well-known hadronic interaction models like, for example, QGSJET.
• Optimized statistical sampling techniques are used for simulations at the highest energies.
• Well tested codes used also by other experiments: Kascade (CORSIKA), AGASA (AIRES), etc.
• AIRES extensively used for detector and algorithm performance studies.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 8
Shower production
• Massive shower production using AIRES and CORSIKA programs.
• CORSIKA shower production in progress.• 35,000 showers produced so far: 9 Terabytes of
data.• Data stored in massive storage system. Access
tools for user selection via Web interface are available.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 9
Auger sim-rec: SD
SD
simulation
TriggerSimulation
Reconstruction
Particlesampling
Generate list of particles entering each local station.
Simulation of Cherenkov light production and propagation; phototube response; electronics.
Simulation of: Local trigger (T1, T2). Central trigger (T3).
Geometrical (Pos. of the core, zenith, azimuth). Primary energy. Estimation of shower maximum.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 10
Auger sim-rec:WCD simulation.
Average muon pulse shape and total charge. Comparison of experimental data taken at
Buenos Aires with SDSim simulations.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 11
Auger sim-rec:Simulation of SD angular
reconstruction
(deg) Proton/Iron Photon
E>1019eV E>1020eV E>1019eV
20o1.1o 0.6o 4.0o
40o0.6o 0.5o 2.5o
60o0.4o 0.3o 1.0o
space angle containing 68% of events
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 13
Auger sim-rec: FD
FD simulation
TriggerSimulation
Reconstruction
Atmospheresimulation
Shower generates light (direct and Cerenkov). Propagate photons through the atmosphere. Light scattering and absorption.
Simulation of optical properties: Diaphragm, mirrors, camera, filters. Electronics simulation.
Simulation of all trigger levels.
Geometrical (Shower axis). Shower profile and primary energy. Shower maximum.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 14
Flores FD geometrical reconstruction
Signal vs. time
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 16
Auger sim-rec: Simulated hybrid geometrical reconstruction
Single FD only Hybrid
Impact parameter reconstruction at 1019 eV
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 17
Auger sim-rec:Simulated hybrid reconstruction
performance.
E(eV) dir (o) Core (m) E/E (%) Xmaxg/cm2
1018 0.7 60 13 38
1019 0.5 50 7 25
1020 0.5 50 6 24
Statistical errors only (68% bounds). Zenith angles < 60o.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 20
Software Distribution system
• The software distribution system is outlined, but has not been implemented up to now.
• Directory structure for software and data is defined.• There is the DPA repository at LYON that allows the
retrieval of all software (reasonably user friendly).
http://auger.in2p3.fr/cgi-bin/cvsweb.cgi
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 22
Computer systems and services.
• Local computing facilities:– Internet services (International link, e-mail, web, etc.).– DPA servers.– Local users computers.– Wired and wireless LAN for portable computers.
• Data mirroring from the site to the level 1 mirrors.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 25
Data mirroring system
Malargüe
Buenos AiresProcessing. Storage.
Distribution
FermilabPrimary mirror
Processing. Storage – safekeeping. Distribution.
LyonStorage.
Distribution
South AmericaRaw event and monitoring dataComplete raw and processed dataSelected raw and processed data
North America
Europe
Level 0
Level 1 Level 2
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 26
Resources
Shower and Detector Simulation
Adelaide, Buenos Aires, Campinas, Karlsruhe, Kracov, Orsay, L’Aquila, La Plata, Leeds, Lodz, Lyon, Mexico, Northeastern, Paris, Pavia, Rio de Janeiro, Utah
Physics Reconstruction
Adelaide, Buenos Aires, Campinas, La Plata, Lodz, Paris, Rio de Janeiro, Roma, Torino, UCLA, Utah
Analysis and Visualization Tools
Northeastern, LAL-Orsay, Roma, UCLA
Data Management and Storage
Buenos Aires, LAL-Orsay, La Plata, Mexico
Software Distribution System
Mexico, Pavia, Torino
Networking Buenos Aires, LAL-Orsay, La Plata, Mendoza, Observatory staff
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 27
Plans for the Future
• Apply the current simulation reconstruction chain to the showers generated at Lyon.
• Next step is to streamline in a coherent way the software for the production phase of the experiment. We expect the first running version in the first semester next year.
• User interface to the Simulation-Reconstruction chain.• Build the Software Distribution System.• Complete the Automatic Data Mirroring and Processing
System.• Complete the Data (real, shower data and simulated data)
Database.• Implement the Buenos Aires Data Center.
Auger FB review, Malargüe, October 2001.DPA – R. Shellard & S. J. Sciutto 28
Conclusions
• The internet connection at Malargüe is setup and running, sending data to the Data Centers.
• The shower production center in Lyon is operating, generating MC showers used in analysis.
• The prototype detector simulation programs are operative.
• The prototype reconstruction programs are acting on Real Data.