Les Les RobertsonLCG Project LeaderLCG Project Leader

High Energy Physicsusing a worldwidecomputing grid

TorinoDecember 2005

last update 21/04/23 07:29

LCG

• CERN is the world's largest particle physics centre Supported by 20 European countries

• Particle physics is about:- elementary particles, the constituents all matter in the

Universe is made of- fundamental forces which hold matter together

• Particles physics requires:- special tools to create and study new particles

What is CERN?

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LCG

• Physicists smash particles into each other to:- identify their components- create new particles- reveal the nature of the interactions between them- recreate the environment present at the origin of

our Universe (big bang)

• What for? To answer fundamental questions like: How did the Universe begin? What is the origin of mass? What is the nature of antimatter?

What is CERN?

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LCG What is CERN?

The special tools for particle physics are:

• ACCELERATORS, huge machines able to speed up particles to very high energies before colliding them into other particles

• DETECTORS, massive instruments which register the particles produced when the accelerated particles collide

• COMPUTING, to re-construct the collisions, to extract the physics data and perform the analysis

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LCG

Mont Blanc, 4810 m

Downtown Geneva

The CERN Site

ATLAS

CERN sitesALICE

LHCb

CMS

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LCG ATLAS, one of the four LHC experiments

As tall as our main building !

ATLAS has 150 million measurement channels

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LCGBeginning the construction of

ATLAS

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LCG

The accelerator generates 40 million particle collisions (events) every second at the centre of each of the four experiments’ detectors

The LHC Accelerator

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LCG LHC DATA

This is reduced by online computers that filter out a few hundred “good” events per sec.

Which are recorded on disk and magnetic tapeat 100-1,000 MegaBytes/sec ~15 PetaBytes per year for all four experiments

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LCG Resources for LHCData Handling

15 PetaBytes of new data each year

CMS

LHCb

ATLAS

ALICE

1 Petabyte (1PB) = 1000TB 10 times the text content of the World Wide Web

100,000 of today’s fastest processors

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LCGHigh Energy Physics: a global

community

1800 physicists (including 400 students)

150 universities/laboratories34 countries.

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LCG

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LCG Italy and Russia in EGEE/LCG

Italian grid Moscow Region sites

JINR, Dubna Moscow State University Keldysh Institute for

Applied Mathematics Institute of Mathematical

Problems of Biology Institute for Theoretical

and Experimental Physics Institute for Nuclear

Research IHEP, Protvino Skobeltsyn Institute of

Nuclear Research Geophysical Center Keldysh Institute for

Applied Mathematics Kurchatov Institute

Torino

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LCG

regional group

LHC Grid

physicsgroup

les.

rob

ert

son

@ce

rn.c

h

Tier2

Lab a

Uni a

Lab m

Lab b

Uni y

Uni x

Tier3physics

department

Desktop Germany

Taiwan UK

FranceItaly

USA

Netherlands

NordicTier-1

CERN Tier 0

Spain

Canada

Uni b

physicsgroup

Lab c

Uni n

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LCGINFN + LHC EGEE Grid

High Energy Physics a new computing infrastructure for science

1999 – INFN Grid Feeds early experience into discussions of how to

organise distributed computing for LHC 2000 – growing interest in grid technology

HEP community main driver in launching the DataGrid project

2001-2004 - EU DataGrid project middleware & testbed for an operational grid

2002-2005 – LHC Computing Grid – LCG deploying the results of DataGrid to provide aproduction facility for LHC experiments

2004-2006 – EU EGEE project phase 1 starts from the LCG grid shared production infrastructure expanding to other communities and sciences

CERN

Enabling Grids for E-sciencE

INFSO-RI-508833

Enabling Grids for E-SciencE

• EU supported project

• Develop and operate a multi-science grid• Assist scientific communities to embrace

grid technology• First phase concentrated on operations

and technology• Second phase (2006-08)

Emphasis on extending the scientific, geographical and industrial scope

world-wide Grid infrastructure international collaboration In phase 2 will have

> 90 partners in 32 countries (incl. USA, Korea and Taiwan)

Enabling Grids for E-sciencE

INFSO-RI-508833

Applications

>20 applications from 7 domains– High Energy Physics– Biomedicine– Earth Sciences – Computational Chemistry– Astronomy– Geo-Physics– Financial Simulation

Another 8 applications from

4 domains are in evaluation stage

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LCG Summary

High Energy Physics at the Large Hadron Collider Enormous computational and storage needs But established global scientific collaborations Ideal application for emerging grid technology

Symbiosis HEP led the early efforts to set up a working grid environment

(with INFN one of the original leaders in this) EU has provided the catalyst to enable the experience and the

enthusiasm to be transferred to other sciences

the grid is the tool – the end is the science Current Status

Operational grid - ~180 sites - 20 application groups Next steps

New communities a global infrastructure for science Improved usability capacity 1 million jobs/day before

the LHC accelerator comes online in two years