Transcript LCG Simulation Project

Simulation Project
Organization update & review of recommendations
Gabriele Cosmo, CERN/PH-SFT
http://lcgapp.cern.ch/project/simu
Application Area Internal Review
March 31st, 2005
Simulation Project
Simulation framework
 Interface to multiple simulation engines (Geant4, Fluka) and geometry
models exchange

Geant4 team participating
John
 Aligned with and responding to needs from LHC experiments, physics
Apostolakis
validation, simulation framework

Fluka team participating
Alfredo
 Framework integration, physics validation
Ferrari

Garfield team participating
Rob
 Garfield package integration and support in LCG - SPI
Veenhof

Simulation physics validation
Alberto
 Assess adequacy of simulation and physics environment for LHC and
Ribon
provide the feedback to drive needed improvements

Generator services
Paolo
 Generator libraries; common event files; validation/test suite;
Bartalini
development when needed (HepMC, etc.)

Witold
Pokorski
AA Internal Review , Mar 2005
Slide 2
Gabriele Cosmo, CERN/PH-SFT
Project Organization
Geant4
Project
Fluka
Project
Experiment
MC4LHC
Validation
Simulation Project Leader
Subprojects
Framework
Work packages
WP
WP
WP
Geant4
WP
WP
WP
AA Internal Review , Mar 2005
Fluka
WP
WP
Slide 3
Garfield
Physics
Validation
WP
WP
WP
WP
WP
Gabriele Cosmo, CERN/PH-SFT
Generator
Services
WP
WP
Recommendations 2003 review – generator services

“The review recommends to set up a test-bed for the comparison of event
generators. This requires a common environment. The data structure must be
adequate to support MC-Truth/data comparison. The recommended common
format (in memory) is HepMC. Concerning the data format: two
implementations should be considered: one for low volume statistics (text
based, XML-like or even simpler); one for high volume statistics (Pool/Root
based). Both outputs should be easily adaptable to the
analysis/visualization/reconstruction system “
 The review recommends setting up a test-bed for the comparison of
event generators. As the reviewers point out this requires a common
environment, and while work is in progress (GENSER, standard event
formats) it has to progress further before a common validation
framework and test-bed can be established
 The project had established a milestone in 2004 to have a proposal for an
event generator validation framework



HepMC has been agreed as the file format for the production of common
generator particle-level event files
For parton-level generator formats, the XML-based metadata format
XMHEP is promoted by the project
For high-volume statistics Pool/Root will be used as persistent generator
event storage
AA Internal Review , Mar 2005
Slide 4
Gabriele Cosmo, CERN/PH-SFT
Recommendations 2003 review – physics validation

“ The review encourages the experiments to increase their
contribution to the validation activity. It is a unique opportunity for
young physicists to contribute to a physics project while being also
involved in a hardware development “
 The contributions of the experiments to the physics validation
activity have been significantly increased in the last 18 months.
This effort has produced important feedback for the simulation
developers
 It is expected that this collaboration will continue in the future
AA Internal Review , Mar 2005
Slide 5
Gabriele Cosmo, CERN/PH-SFT
Recommendations 2003 review – simulation framework

“ The review encourages the development of the VMC with the aim of
providing an abstract interface to detector simulation packages and a
common interface to the geometry systems used from different simulation
engines (Geant4, Fluka, etc). The VMC should also be interfaced to the
common solution adopted by GENSER. In the short term, in order to support
the physics validation activities one should set up a simulation infrastructure
based on Geant4 and Fluka/Flugg. In the medium and long term, the VMC
should become the main tool We recommend a discussion with the
experiments, Geant4 and Fluka to evaluate their interest in the framework.
The priority and manpower should be adjusted according to the outcome of
the discussion “
 The review noted a lack of strong interest among the experiments in a
common simulation framework, while noting that the physics validation
project requires the ability to compare multiple simulation engines with
the same detector configuration. The project was therefore re-scoped to
focus on applying existing tools to meet the specific, immediate needs of
the physics validation project – in particular to set up an infrastructure
based in Flugg for test beam simulations, and to exchange persistent
geometry descriptions through GDML
 The review encourages the further development of the existing VMC as
a generic simulation framework. This work is continuing outside the
scope of the applications area as it has been up to now
AA Internal Review , Mar 2005
Slide 6
Gabriele Cosmo, CERN/PH-SFT
Recommendations 2003 review – Fluka

“ The reviewers were disappointed by the absence of presentation by
the Fluka team “
 The review came shortly after a Fluka workshop the preceding
week and the pressures of priority work following the workshop
prevented the planned Fluka talk from taking place
 The Fluka team apologizes that this situation prevented them
from participating in the review as originally planned
AA Internal Review , Mar 2005
Slide 7
Gabriele Cosmo, CERN/PH-SFT
Simulation Project Milestones : 2003-2004



























2003/12: Geant4 release 6.0
2003/12: Simulation physics requirements revisited
2003/12: Simulation framework prototype supporting G4 and FLUKA via FLUGG
2003/12: Proposal for MCDB deployment in the LCG environment
2004/2: LHAPDF generator included in generator library
2004/2: First cycle of hadronic physics validation complete
2004/2: SPI-G4 collaborative infrastructure pilot
2004/3: Agreement on formats for event generator common samples
2004/3: Detector description (GDML) proposal to PEB
2004/03: Geant4 6.1 release - production improvements
2004/4: COMPHEP, ALPGEN and EVTGEN generators included in GENSER
2004/5: Review/prioritization of simple benchmarks for simulation physics validation
2004/6: Proposal for generator event production environment
2004/6: Geant4 6.2 release - resource usage refinements
2004/7: Beta version of MCDB in production in the LCG environment
2004/7: Proposal for an event generator validation framework
2004/9: Agreement on parton-level event generator file format
2004/9: Comparison of LHC calorimeters for EM shower development
2004/10: Geant4 geometry volume registration customization
2004/10:First consolidated G4 acceptance suite for LHC applications
2004/12: Generator production framework, beta
2004/12: Geant4 physics model prototype concluded
2004/12: Second iteration of hadronic physics validation complete
2004/12: Simulation test and benchmark suite available
2004/12: Geant4 7.0 release - physics models and geometry
2004/12: Geant4 validation in LHC production
2005/06: Final physics validation document complete
AA Internal Review , Mar 2005
Slide 8
Gabriele Cosmo, CERN/PH-SFT
Simulation Project Major Milestones : 2004















2004/2: First cycle of hadronic physics validation complete
2004/2: SPI-G4 collaborative infrastructure pilot
2004/3: Agreement on formats for event generator common samples
2004/5: Review/prioritization of simple benchmarks for simulation physics validation
2004/6: Geant4 6.2 release - resource usage refinements
2004/7: Beta version of MCDB in production in the LCG environment
2004/9: Agreement on parton-level event generator file format
2004/9: Comparison of LHC calorimeters for EM shower development
2004/10:First consolidated G4 acceptance suite for LHC applications
2004/12: Generator production framework, beta release
2004/12: Second iteration of hadronic physics validation complete
2004/12: Simulation test and benchmark suite available
2004/12: Geant4 7.0 release - physics models and geometry
2004/12: Geant4 validation in LHC production
2005/06: Final physics validation document complete
AA Internal Review , Mar 2005
Slide 9
Gabriele Cosmo, CERN/PH-SFT