Auger FB review, Malargüe, October 2001. DPA – R. Shellard & S. J. Sciutto1 PIERRE AUGER OBSERVATORY Finance Board Review Data Processing and Analysis.

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 19

Visualization Tools

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.